Showing posts with label john. Show all posts
Showing posts with label john. Show all posts

Saturday, March 14, 2015

Geography Le$$on

Audrey discovered the roll of foreign currency that's been on my dresser forever. In the 90s I travelled a lot for business and then used the miles I earned to travel even more for pleasure and adventure. Looking at the bills provides a good geography lesson (and a trip down Memory Lane).

Inventory:

  • Asia: China, Hong Kong, Kazakstan, Korea, Macau, Pakistan, Uzbekistan, Saudi Arabia, Thailand
  • >
  • Europe: Austria, Belgium, Denmark, France, Germany, Italy, Netherlands, Scotland, Switzerland
  • North America: Canada and Mexico.

I've also been to Argentina, Australia, Bahamas, Chile, England, Japan, New Zealand, Portugal and Spain but apparently didn't keep any bills from those countries. I have a large jar of foreign coins that probably contains money from several of them.

I'm very excited for the girls' first overseas trip coming up in just a few weeks!

Monday, May 26, 2014

My Spring Collection

Having a dog leads one to walk around one's neighborhood a lot more.

During those walks this spring, I've been enjoying all the flowers in neighborhood gardens. When I see especially pretty ones, I snap a photo and send virtual flowers to my sweetheart.

This album is a collection of my favorites.

Sunday, May 25, 2014

John's Birthday

My birthday was this week.

It was an especially happy one. Way better than last year, when I was in surgery for a biopsy on my birthday.

Whenever I don't ride my bike to work, I take the train and then walk a little more than a mile to the office. I often walk along the Greenway and pass the Custom House. A couple of months ago I stopped in and discovered that one could go up in the tower. At the time, Boston was still in the throws of a prolonged unusually cold winter. I wanted to wait until it was warmer and then have the family join me in town after work to visit the tower.

The stars happened to align for such a visit on my birthday!

The family met me at South Station. We made a brief visit to a Pop Art exhibit at the Intercontinental Hotel. Then we visited my office for a few minutes and Audrey and I played some foosball. After that we moseyed along the Greenway (the park on top of the Big Dig) to the Custom House.

While we were waiting for access to the tower we explored the lobby. The building is now a Marriott Vacation Club hotel. The round lobby is beautiful, with two balconies and a high domed ceiling. There's also a cool cutaway model of the building.

Then we were shown to the elevators and went to the observation deck. It was an excellent clear evening and we could see forever. The tower has a very cool view of Logan Airport just across the inner harbor. It also gives a great perspective on the North End.

The girls chased each other around the tower a few times.

On our way back down we stopped in the Game Room, which happens to be where the clock mechanism is. It's surprisingly small, and the single mechanism is linked by four arms to the clock faces on the four sides of the tower.

Apparently that linked mechanism was added later, in order to make room for elevator shafts. Before that, each face had its own mechanism and, since they never agreed, the tower clock was known as "The Four-faced Liar".

From the game room we could see through a window to the inside of one of the clock faces. We could see through the huge "6".

After the tower we went to nearby Quincy Market to have dinner at Wagamama. It's a new favorite of the girls'. They have yummy noodle and rice dishes. Audrey has been enjoying their teriyaki cod.

We would have also ridden the cool one-year-old custom carousel on the Greenway, but it was only open on weekends until Memorial Day - we were a few days too early. Next time.

After dinner we made our way to the T for a quick ride home.

This was the best birthday I've had in a long time. I thoroughly enjoyed our family evening together.

And no surgery!

Sunday, August 25, 2013

Hiatus

We've had a little hiatus here at methot.net. I always assume most readers are family, but I know several are not: you've been in the dark all these months.

On May 6th I went to the doctor for a sensation in my throat. Over the next couple of weeks I would learn that it was a walnut-sized tumor at the base of my tongue.

That obviously sent us off on a little detour - a different kind of summer than we were expecting. In retrospect, I should have posted a notice here but my mind was elsewhere.

You can read that story in great detail at Cancer Fun Time!. There are currently 87 posts there, but if you want to start at the beginning, here's a link to the first post.

Treatment ended two and a half weeks ago. I have a long way to go in recovery but I've had enough energy this weekend to organize a bunch of photos covering April-June. I'll get some posts written to accompany those albums in the next couple of days if I continue to feel relatively good.

The cancer I had, by the way, is considered curable and I am expected to be cured at this point. That's not official until after five years of clean PET scans, the first of which I'll have in November. But it is our assumption going forward.

Friday, May 3, 2013

Boston Bike Commute Video

I've been thinking about making time-lapse videos of my bike commute route for many years. Now that I have the GoPro camera it's dead simple. Yesterday morning I finally remembered to mount the camera and off I went.

The video is shot with an image taken every half second. After conversion, the end result is that the motion is sped up about 10 times. Some of those cars crossing my path look like they are cutting right in front of me (which does happen a lot) but I'm not approaching them as fast as it appears.

One thing I notice is that with the distorted time and the resulting rapid light changes as I ride in and out of shadow is that you lose all sense of up and down. There are several hills along the route but one can hardly tell in the video.

Friday, March 8, 2013

Diggin' Out

We had a weird snow storm over the past 36 hours. The center of the storm is parked 500 miles away in the Atlantic but the ends of its arms delivered plenty of snow to parts of New England. Local meteorologists found it hard to forecast because they knew different parts of the region would get very different accumulations. We got about 8 inches or so.

We got a robocall at 6:30 saying school would be two hours late. Then at 7:30 they cancelled it. The girls were very excited.

Click on the picture to see a time-lapse video of me doing the snow clearing chore. It's not so bad with a machine!

Thursday, November 1, 2012

Indoor Skydiving

Back in July while in Seattle we visited iFly Indoor Skydiving. I recently came across the USB stick containing the photos taken by the wind tunnel operator with the built-in camera. They came out a lot better than the ones taken with our phones.

Brace yourself, I finally have a couple hundred photos from July until now organized and they're almost ready to publish.

Friday, May 25, 2012

Birthday Greetings from Charlotte

She loves me six hearts' worth!

Birthday Greetings from Audrey

Audrey learned how to use a word processor a while back and has used it for school work. This week she used it to make a wonderful custom birthday card for me.

Wednesday, January 25, 2012

Two-Legged Robot Walker

The Christmas list I gave to Carol contained mostly electronics hobby stuff, including a couple of servos and a Lynxmotion SSC-32 serial servo controller. The servo controller allows one to exercise complex control over multiple servos (32 of them with this board) via simple commands sent over a serial port.

So I had three available servos, a servo controller and an Arduino and I wanted to build a walking robot. Hmmm. I'd need to use one servo for each of the two legs but then I need a way to vary the traction of the legs so one can move forward on a return stroke while the other moves backwards on the power stroke. A moving weight should do it!

I didn't have any small hardware for attaching servos to stuff on hand. Nor did I have any good materials for the chassis. So I made the chassis out of cardboard in which I cut holes for the servos and I used thin steel craft wire to tie the servos in. I also used the wire to strap pencils to the servo horns as legs and as a boom to hold the swinging weight. Add a couple of rubber bands to hold the chassis in the desired shape and the electronics and batteries in place and viola: a humorous hack of a robot!

After a few minutes spent programming the Arduino to send the desired commands to the servo controller, it walked! Sort of.

It may not be pretty, but it's the first robot I've built completely from scratch.

Click the image to see the video.

Saturday, December 17, 2011

Hong Kong and China

I am on the plane returning from a week-long trip to Hong Kong and Shenzhen China. This was my first international travel in more than 10 years. I've missed it! If you knew me back in my traveling days you know I love to write about it, so come along.

One of the benefits of working for a humongous corporation is that on international travel one can travel in business class. When I purchased my ticket for this trip it so happened that the cheapest business class fare was on Cathay Pacific, a Hong Kong-based airline that is considered among the best for long haul flight comforts. So, unusually, one of the things I looked forward to about the trip was the flights! I had never flown with a "pod" seat before, or even a seat that lays completely flat.

Both flights were on Boeing 777-300ER aircraft. My trip over was in "new business class" on a brand new plane. My return trip was in "current" business class. New business class is a little roomier but they were both quite nice. The seat is adjustable in many ways including lying completely flat. Each seat has a large TV on which one can watch dozens of movies or TV shows, the live map that shows where the plane is along the route and even a live camera mounted on the belly of the aircraft. I've got a lot to write about so just suffice it to say that Cathay business class was wonderful.

It is 13 hours earlier in HK and China than in Boston. I couldn't figure out what the best sleeping schedule would be on the plane to try to sync to HK time upon arrival so I didn't even try. I slept for a few hours on the 15.5 hour flight but not enough. I arrived in HK at 6:30pm on Monday evening and found my way to the Airport Express train into the city. My immediate question was, "why can't we build systems like this in the US?" The Airport Express is quiet, efficient and fast. I estimate we reached 80mph. It takes 24 minutes from the airport, which was built in the 90's on an outlying island, to the city center.

Once in the city center I transferred to the subway system to get to my hotel in the northern outskirts of HK near our first work site. The subways are also modern, clean and efficient.

The weather for my entire trip was perfect - in the high 60s and low 70s with no noticeable humidity. The locals think it's "cold" and they are all wearing jackets with some in full-on winter coats. Meanwhile I was in short sleeves; maybe changing into a long sleeve shirt in the evening.

In addition to my first international travel in some time, this was also my first business travel of more than a couple nights since I met Carol and also since I had children. I knew I'd miss them! But through the wonders of modern technology we were able to video chat once or twice a day on our phones! The 13-hour time difference made it pretty convenient for me to call them at their bedtime when I was getting up and at their breakfast time when I was getting back in the evening. Being able to see my wife and girls' faces every day made a huge difference!

The reason this post has taken so long is I've been sick since my return (cold -> sinusitis -> bronchitis) and haven't had the energy. The remainder of this post was written on December 27.

The largest DNA sequencing center in the world is at BGI (formerly the Beijing Genomics Institute but now a standalone company). Merck is one of BGI's biggest customers and we sequence thousands of samples every month at BGI. That generates terabytes of data per week and we have to somehow get that data back to our US data centers so our scientists can analyze it. My main job for the past year has been to streamline that data delivery process. The purpose of this trip was to meet our counterparts at BGI and enhance data delivery even more. I traveled with my coworker, Blake, who does all of the real work. I'm just a manager.

Our first day of meetings was at BGI's Hong Kong office. This is BGI's production center where most of the sequencing is performed and analyzed (although the analysis is performed remotely by bioinformaticians at BGI's Shenzhen site in China). The most popular DNA sequencing machine at the moment is the Illumina HiSeq. These machines cost about US$500,000 each. BGI Hong Kong has almost 100 of them. We were given a great tour of BGI HK and met with the director and the IT staff. They also took us out for a delicious Thai lunch. I didn't know it but this was the start of a string of great meals we were to eat.

Tuesday afternoon after our HK meetings were complete, a cross-border car hired by BGI picked us up to take us to Shenzhen. It is only about an hour trip. He delivered us to the lovely Sheraton Dameisha Resort at the eastern edge of Shenzhen on the South China Sea.

Wednesday morning our BGI host, Sifei, picked us up at the hotel and drove us the short distance to BGI Shenzhen. We had very productive meetings in the morning. Blake and I have been working with BGI via email and teleconference for almost a year and it was great to meet all of our counterparts in person. We also gained useful knowledge about BGI's organization and processes that will help us work with them in the future.

For lunch, Sifei took us, along with Rena and Dennis who had traveled from BGI HK for the meetings, to dim sum. It was fantastic. See the photos. I tried everything except the chicken feet.

BGI has almost 4000 employees, mostly in Shenzhen. They hire a lot of people right out of college. BGI has dormitories right next to their offices for employees who are transitioning from university life to professional life. They also have a large cafeteria that feeds 2000 people at lunch. We ate lunch there on Thursday. The presentation - a buffet served on metal trays - is not very attractive but the food was decent.

Wednesday evening we took a taxi into one of Shenzhen's shopping districts called Dongmen. For the first hour we just wandered aimlessly through the crowded streets. There were lots of Christmas decorations everywhere, including very large lighted decorations that covered the entire sides of high-rise buildings and big light displays along the pedestrian shopping streets. Prices were interesting. I saw nice looking winter coats for less than US$20 and men's dress shoes for US$8. But electronics, even though they are probably made on the outskirts of Shenzhen, were priced the same or higher as in the US.

We debated a lot about where to eat. I was being more choosy than usual because I wasn't feeling well (head cold and jet lag). We finally found a Japanese restaurant in a mall and slapped together a yummy miscellany of Japanese dishes.

Some observations about Shenzhen:

    We saw many cyclists riding (slowly) along the center jersey barrier on very busy high-speed roads. Some were even riding the wrong way. Some had kids on the back of the bike.

    On a walk during a break on Thursday we saw several factories with adjacent dormitories. The BGI site was formerly a shoe factory.

    In Shenzhen cars definitely have the right of way. Pedestrians wait. Although I noticed that when an approaching vehicle is at a certain distance pedestrians will enter the road and the drivers generally slow down to allow the pedestrians to cross.

    I saw one dad on a small motorcycle with three small kids along. Two were on the seat behind the dad and the other was on the gas tank in front of him.

Thursday we had a brief meeting at BGI Shenzhen and then spent much of the day working by ourselves in a conference room. We had accomplished everything we had hoped for. Late in the afternoon we were given a tour of the Shenzhen facility and then driven to the border crossing back into Hong Kong. The HK subway system extends right up to the Chinese border adjacent to central Shenzhen. We crossed the border without problems and took the long subway ride into central HK.

We had to purchase our airline tickets far in advance of the trip because the fares rise dramatically once the departure is less than a month away. At the time of purchase our meeting schedule was not confirmed and we wanted to make sure to leave enough time. So we planned to arrive on Monday night and depart for home on Sunday. Once the agenda was confirmed, it left Friday free. So we ended up with two whole days of free time in Hong Kong before we would head home.

I have a neighbor who travels to Hong Kong twice a year. It so happens that the night before I departed she appeared at a neighborhood holiday party just after arriving home from a HK visit. She gave me some good tips about things to see. One was to go to the Intercontinental Hotel bar in Kowloon because it has floor to ceiling windows with a view across the harbor to Hong Kong. That was our first stop when we arrived back in HK.

You can read the history of Hong Kong on Wikipedia. Hong Kong proper is an island that Great Britain basically stole from China after the First Opium War. After the Second Opium War, Britain stole the Kowloon Peninsula across the harbor from Hong Kong. Then later Britain annexed the New Territories which are the mountainous area between Kowloon and the Shenzhen River. All of that area is referred to as Hong Kong.

The Hong Kong skyline from the Intercontinental Hotel was indeed impressive. Even in non-holiday times it has a lot of large lighted corporate logos and names on the tops of skyscrapers as well as lighted features on the facades of the buildings. For example, the Bank of China building has vertical and diagonal "beams" that light up in various animated sequences.

For the holidays many buildings in HK have animated lighted decorations covering entire sides of the buildings. So the HK skyline as viewed from Kowloon is a huge light show. There are even lasers that occasionally beam from the tops of buildings and scan the sky.

The first thing I noticed in HK is that no one jaywalks. It reminded us of Seattle. We did it once in a while because we just couldn't stand to wait for the signal to cross an obviously empty street. We were also apparently juicy looking targets for touts: I couldn't walk 50 feet in central Kowloon without some guy asking me if I needed a tailor or a watch. On rarer occasions one would ask me if I wanted hashish.

Back in late 1997 I visited my good friend Phil and his wife while they were living in Hong Kong. I was there very close to the handover of Hong Kong back to China (HK is now a Special Administrative Region). I was fascinated by HK then and I was excited to return. During that visit Phil and Lysiane and I took the hydrofoil to Macau, which was a Portuguese colony and which was also handed back to China in 1999 (and is also now a Special Administrative Region). Macau has been a gambling center for a long time but in the past decade or so the casino business there has really exploded. I read in the Boston Globe last week that Macau generates US$30 billion per year in gambling revenue. The Las Vegas strip generates US$6 billion.

I was interested in returning to Macau to see the result of that growth. Blake was interested, too, so we took the fast catamaran for the one-hour trip to Macau on Friday morning and spent the day there. We explored the new area of western casinos (Wynn, MGM) as well as some of the asian casinos. The popularity of games is quite different there. Baccarat is the most popular game by far. We only saw two craps tables, at the MGM, and they were empty. I didn't see any blackjack. For lunch we bought yummy "pork chop sweet bun" from a tiny shop near the historic cathedral ruins.

Once back in HK we went to dinner at a place Blake had heard was good: Din Tai Fung. Their specialty is dumplings, but in addition to dumplimgs we also had several other dishes and we both thought the meal was fantastic. It turns out there is a Din Tai Fung in Bellevue across the lake from Seattle!

Saturday we devoted the day to Hong Kong Island. We started by taking the historic Star Ferry across from Kowloon. It was smoggy and/or hazy but the view of the skyline and Victoria Peak in the background was still good. We made our way to the Peak Tram, a funicular that carries passengers to The Peak. We took a walk along Lugard Road which circles the top of the peak and saw great views of HK. It is considered the most vertical city in the world (meaning it has a lot of very tall - and very skinny - buildings) and it looks quite unusual and interesting from above. We also walked past some walled estates that given their prime location in what is already the most expensive real estate market in the world are probably worth amazing sums.

Blake had heard from a friend about another good food spot, a small noodle shop popular with the locals called Kau Kee. So we walked there from the base of the Peak Tram. As we were told to expect, there was a 15 minute wait but the line moved very quickly. We were seated at a table with 4 other people and ordered our beef noodles; mine with flat noodles and Blake with rice noodles. A few minutes later they arrived. They were fantastic! In a trip that featured many good meals this was my favorite. Wonderful flavor.

From there we went in search of the Western Market. It turned out to be not quite what I was expecting. I was thinking it would be a large covered market like in Mexico with foods as well as household goods and clothes. It actually consists mostly of textile dealers with so many bolts of fabric stuffed into their stalls there is barely room for a person to stand. There was also a shop devoted entirely to metal models of transit buses at a variety of scales. Many represented specific routes in Hong Kong. I looked at them for quite a while as potential Christmas presents but the prices were a little too high for the level of appreciation I knew they'd receive.

Finally we made our way back to the Hollywood Road neighborhood for some Christmas shopping. My neighbor had recommended a shop where she bought some scarves. I bought a couple there for Carol and they were a hit. I also found stocking stuffers for the girls (anything with Chinese writing would be a hit) and I found some great Chinese pajamas for each of them.

Saturday night was our last night before flying home on Sunday. We thought we were going to have hot pot for dinner. But right next door to the hot pot restaurant was a Korean barbecue place and we decided at the last minute to go there. Either choice probably would have been good but our dinner was yet another fantastic meal. Beef and chicken on the in-table barbecue grill, plus varied kimchee and vegetables and finishing off with my favorite Korean dish: bibimbap. Delicious.

Early Sunday morning I took a taxi through empty streets to the station for the Airport Express train. I had breakfast in Cathay Pacific's business class lounge before boarding my flight home. Right after takeoff I set my watch back to Boston time, and after lunch I slept from midnight to 8:00am Boston time. I thought perhaps that would magically get me in sync. Wrong. I had horrible insomnia the whole week after I returned, sleeping only about 3 hours per night. That didn't do my cold/sinus infection any good and it only got worse. I finally went to the doctor on Thursday and was diagnosed with bronchitis. I've been on the sofa ever since. Feeling better today, though.

I hope you enjoyed the novel! Be sure to see the photos.

Thursday, December 1, 2011

My Work in the News

Today the New York Times published an article entitled, "DNA Sequencing Caught in Deluge of Data" It describes the explosion of data being generated by DNA and RNA sequencing because the cost of sequencing has fallen dramatically.

When the Human Genome Project sequenced the first human genome in the late 90's, completing in 2001, it cost billions of dollars. But it launched a technological revolution that is driving the costs down rapidly. The current goal is "the $1000 genome" and that will probably be achieved within a year. The current cost is about $3000.

The article starts with BGI in China, an organization with a significant portion of the world's current sequencing capacity. Coincidentally, I will be visiting Sifei He (quoted) in China the week of December 12. My employer is BGI's largest customer, and my team's job for the past year has been figuring out how to get that data from China to our data centers, organize it, "index" it so it can be searched, and support retention policies governing when to get rid of it (it's expensive as hell to store hundreds of terabytes of data - you can't just put it on hard drives you buy at Best Buy).

If you wonder what I do for a living, this article does a pretty good job of describing it. The best part of my job is witnessing the bleeding edge of (biological) science.

By the way, the caption on the photo in the Times article is incorrect. The professor is not looking at "cells", he is looking at a "flow cell". The flow cell has eight tiny channels running through it that you can think of as test tubes. To perform a sequencing run an operator loads them with DNA or RNA that has been extracted from biological cells.

Sunday, November 20, 2011

Melrose STEM Expo

This past summer a group of parents in Melrose formed the Melrose Education Coalition, which aims to encourage improved STEM (Science, Technology, Engineering and Math) education in the Melrose schools. Our neighbor Jen is active in the MEC; she let us know about the Melrose STEM Expo to be held on November 19 and asked if I would like to volunteer to present an activity. Of course I agreed immediately.

I originally hoped to present something that is related to biology, but after much searching I couldn't find an activity I could do that would be hands on and fast enough for people just stopping by a table at an expo. Most of the biology experiments I could find consist of growing plants or other similarly long-timescale things.

My fallback was an activity the girls liked at Maker Faire in September: Squishy Circuits. The web site provides easy recipes for homemade play-doh of two types: conductive and insulating. Then kids can just take wire leads attached to batteries, LEDs, buzzers and motors and stick them in the play-doh to build circuits.

I used the project as an opportunity to check out a local electronics store I recently discovered: You Do It Electronics in Needham. You Do It is like Radio Shack used to be before they shifted to consumer gadgets, but four times as big. It was perfect for getting materials for squishy circuits.

The weekend before we made a test batch of the conductive play-doh and it worked great. I played around to find the right type of wire leads to attach to the various components to make them easy for kids to use and also as durable as possible. In the end I also packed tools and materials to make on-the-spot repairs which turned out to be a good idea.

The girls practiced with me a little and seemed to have it down. They were very excited that they would get to be behind the table with me. Carol was excited to help, too, so it turned into a family affair.

The expo was held at the Middle School. The high school robotics team I mentor was scheduled to be there as well as the middle school robotics team and the LEGO robotics program that I'll volunteer at this week at Audrey's and Charlotte's school. But I had no idea how many attendees to expect.

Well, I was blown away. There were probably at least 200 attendees and a pretty large collection of fellow exhibitors with lots of great activities for kids. Squishy Circuits was a huge hit! We had six "stations" at our table and they were all full almost all of the three hours that the event ran. We had kids from pre-school to 5th or 6th grade. Parents seemed equally excited about it and many of them worked hard to keep their kids focused on what we were teaching them.

Carol and the girls were really into it. Audrey was a wonderful teacher. We also had two parent volunteers with us: Amy and Chris. Chris happens to be the girls' art teacher in after-school art classes they are taking. They were fantastic.

Walking around the event almost brought tears to my eyes. I was inspired by both the volunteer energy that was apparent and by the interest of so many parents. It bodes very well for what MEC is trying to do.

I also had a conversation with James Horne who is the overall head of the robotics programs about starting a Junior LEGO League team at Roosevelt School. I'm very excited to do that.

Saturday, October 29, 2011

Mister Bones

"Mr. Bones" is a plastic skeleton my mom gave the girls a long time ago. We like to dance with him, dress him up and put him in weird poses. His arms often fall off.

For the past month I've been thinking about using Mr. Bones in a porch display for Halloween. This morning I woke up designing it so I surrendered and just built the damn thing. I used an Arduino to control LEDs for the eyes and heart. The biggest challenge was designing code to generate independent waveforms in a single loop (for the geeks out there, I ended up doing it by populating two lookup tables and the main loop just steps through them in parallel). I assembled the soundtrack from free sound effects found on the web and edited them together in Garage Band; it will play on an iPod with speakers.

This is the first time I've built an "animatronic" Halloween display. I think they're just going to have to get better every year, now. Next year's will include motion.

Sunday, June 5, 2011

First Arduino Robot, with Wii Nunchuck Control

I received some generous cash gifts for my birthday and I knew just what to use them for: to buy some parts to build a robot I've had in mind since December. The parts came Friday so I spent my free time this weekend getting the basics up and running. Click the image at left for a short video of the results.

The robot chassis is this kit from Maker Shed: a nice, simple base to build on. The brain of the robot is an Arduino microcontroller. And I also used the Motor Shield from Adafruit.com which is a very flexible and convenient way to control motors from an Arduino. A "shield" is another circuit board with pins that line up with the Arduino's pins so you can just put the shield right on top of the Arduino. You can even stack multiple shields. My ultimate goal is to use my iPhone as a remote control for the robot so it will also have a wi-fi shield soon for wireless communications.

I've had the LEGO Mindstorms NXT set for a few years and have enjoyed it. I'll keep using it and in fact will learn how to interface it to the Arduino. But the Arduino is a much more open and flexible controller. If you google Arduino you'll see that it gets used for an amazing number of creative projects.

I needed a way to control the robot until I get the iPhone remote control figured out. One of the easiest ways to provide directional input is with a nunchuck controller from a Wii. The communication protocol that the nunchuck uses (I2C) is supported directly by the standard Arduino libraries, and the Arduino community is broad, so it was easy to find the code I needed to make that work.

I'm very excited to finally be working with the Arduino. If I can find the time, I'd love to demonstrate a project at Maker Faire in September. And I'd really love to take a robot to the Robot Block Party at the Boston Museum of Science next April. I have a concept in mind for a great demonstration robot that kids would love - it will make souvenirs for them.

In the Arduino open source spirit, you can find the source code here:

Creative Commons License
Arduino Nunchuck 2-Wheel Control is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License


Saturday, May 21, 2011

Happy Birthday to Me!

Another year gone. Boy do they go by quickly as I get older.

My birthday wish was for many more years of happiness like I have right now. I have a wonderful wife and two fabulous kids and loving family and friends and just a pretty sweet life all around.

I chose to spend the day installing the backsplash tile in the kitchen. It's one of the last projects before the kitchen remodel is completely done and it will be very satisfying to check that off.

I've never laid tile before but I've watched my dad and others do it many times and he and they all told me it's simple. Sure enough, it's pretty easy. I got one wall done today after a late start. I'll finish tomorrow and then grout it one night next week or next weekend.

Carol made us a great lasagna dinner (Audrey's suggestion) and two cakes! I like both yellow cake with chocolate frosting and chocolate cake with white frosting so she made one of each! And she and the girls gave me a copy of "Geek Dad: Awesomely Geeky Projects and Activities for Dads and Kids to Share." Perfect.

My parents and sisters called me from Seattle. They happened to catch me while I was at Home Depot renting the tile saw. It was very sweet having them all call me together, especially when they all sang Happy Birthday! I'll see them all in about 6 weeks.

I'll publish more photos of the kitchen tile job when it's done.

Monday, January 3, 2011

Helium Balloon Aerial Photography

I've subscribed to Make: magazine since the first issue and I'd love to try almost all of the projects they publish! I haven't had time for very many but when I saw the Helium Balloon Imaging Satellite project in Issue 24 I knew I had to do it.

I've wanted to learn more about electronics for a long time but so far have only dabbled. Also I'm determined that my two young daughters not succumb to the idea that girls cannot be good at science, engineering and math so I plan to expose them to as much of those as I can by exploring projects with (or at least in front of) them.

The balloon photography project uses a PICAXE microcontroller as a camera timer. It cost about $3. The camera is a “drugstore” digital camera that cost less than $10. I hacked the camera to install wires that allow the shutter to be operated by a relay that's activated by the microcontroller. It's programmed to take a picture every few seconds.

It took me four attempts to get everything right.

On our first attempt it felt at ground level like there was no wind, but soon after we launched the wind caught the balloons. They almost got tangled in our phone wire, which should have been my first clue to stop and try later. But I persevered and a minute later the balloons were hopelessly tangled about 40' up in a large tree. Big disappointment. At least with all my jerking the string to try to free the balloons the camera rig fell off and dropped into the snow so it wasn't also lost in the tree.

A few days later I bought more balloons to try again. Unfortunately I had a bad connection in my controller circuit and the camera only took two photos. We were losing daylight and I didn't have time to fix the circuit for another attempt that day. We took the balloons in the house overnight.

The next day we were excited to try again. Unfortunately attempt number 3 was an immediate failure because the balloons had lost lift overnight and would no longer lift the payload. Off to the store I went to buy more balloons.

Finally, attempt number 4 went off without a hitch. There was only a very slight breeze aloft and we didn't have any close encounters with trees. The camera took all 60 photos it can hold. Success!

We still had balloons and daylight so we decided to go for one more mission before rewarding the kids with the balloons. We had a near disaster when the breeze kicked up and took the balloons over the house and they became briefly entangled on the roof. We got a free roof inspection! (Roof looks good)

Fortunately when the breeze died the balloons freed themselves and we got a few more minutes of flight. The balloons were losing lift, though, and were barely overcoming the weight of the payload by that point. I had to carefully maneuver the craft past more trees but managed a successful recovery.

This project was fun and I learned a lot about microcontrollers and basic electronics. The kids loved seeing the balloons so high in the sky and they especially loved having a lot of balloons to play with when I was finished with them.

I plan to reuse the camera rig from a kite in the spring and summer.

Oh, you might ask why I didn't fly the contraption in a more open area. That would have defeated the purpose of getting pictures of our own house!

Monday, May 24, 2010

John's 50th Birthday


Friday I reached the half-century mark. It's hard to believe I've been alive that long. Like most people I talk to, I feel much younger than my actual age.

Carol has started a babysitting swap with our new next door neighbor Sue. So on my birthday we had a date night. We revisited an Italian restaurant near Fenway Park that we discovered a year ago when we were here house hunting, and then walked across the Fens (a big park) to the Museum of Fine Arts (in background of photo above) where we enjoyed a couple of hours of blissful, child-free browsing. There is currently an interesting Talouse-Lautrec exhibit, and exhibit of Harry Callahan photography, a fascinating Albrecht Dürer (1471-1528) printmaking exhibit, and a visiting Van Gogh ("The Sower") that is displayed among the other Impressionist masters.

Saturday was a busy day with T-ball photos in the morning and a game in the afternoon, plus preparing for a little birthday BBQ in the late afternoon. We invited some friends from work and some neighbors and had a wonderful time. It was a perfect day for it - sunny and 70s.

Sunday I got a little further on the kitchen project by getting the floor sanded. All of the scratches and stains are gone and it's ready to be refinished. Before that I need to finish the walls (which I should be doing right now instead of writing this). Once the walls are painted and the floor is finished, it'll be time to hang cabinets and we'll be in the home stretch.

Wednesday, April 21, 2010

Warm Welcome


I rarely travel for business these days, but tonight I returned home from two nights away in Philadelphia. The girls really missed me (as I did them)! They picked me up at the T station and Audrey hopped out of the car and into my arms for a huge hug. Charlotte was strapped in, but when we got out of the car she hopped up and melted into my arms for a long time. Then they took turns getting more hugs and kisses. We went to dinner and I had to sit with both of them. It was very sweet, and I can't imagine a better welcome home.

Tuesday, April 13, 2010

Weather at the Methots' House


A very good and generous friend and fellow geek sent me a personal weather station a few weeks ago: an Oregon Scientific WMR200. It's been set up for a while now but I had to write some code to get the data it gathers uploaded to the internet for all to see.

If you've never visited The Weather Underground, it displays data from thousands of personal weather stations everywhere. The "WunderMap" will guess where you are and show stations in your area. The Methot homestead is now present as station ID KMAMELRO4. Bookmark that and you'll always be able to see what the weather is on our back porch!