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Category: Shenzhen


Project Scan Trike

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I’m in love with electric bikes. They’re cheap, quick, cost nothing to run, and get me everywhere I need to go in the city. In Shenzhen I can drive it year-round and an electric bike is truly king of the road here – I can drive literally anywhere I want: from sidewalks to highways. Lately a few things have conspired to take my passion to the next level.

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First, I got a 3D scanner and software combo that works really well. The Primesense Carmine 1.09 combined with Skanect makes beautiful, watertight meshes and is ridiculously easy to use. Whatever magic smart beans they’re eating, its working. Mad props to the people at both those companies.


Second, my buddy Nick is building awesome delta bots that are gorgeous to watch as well as produce amazing prints. I was bringing a 3D printer back to the office one day when I basically got mobbed by inquisitive people on the streets asking what it was. Turns out I can actually decently describe a 3D printer in Mandarin. Who knew?

Third, I saw a bunch of people at MakerFaire carrying around 3D printers and printing on the go. This is awesome and it looked really fun. I wanted in.


These experiences, combined with my desire to practice more Mandarin in a fun way came together into a project I’m calling Scan Trike. The basic idea is to take an electric trike + 3D printers + 3D scanners and turn it into a mobile scanning/printing experience. This fits perfectly with the trike culture – these things are basically half pickup truck half mobile storefront. If you’ve ever been to China you’ve seen these trikes everywhere – from ladies selling fruit out of the back of a trike to a dude with a mountain of cardboard impossibly perched on top. They’re ubiquitous and multipurpose and just generally awesome.

Once we get this whole shebang put together, we’ll head out to a public area and start scanning people. Hopefully we’ll be able to crank out 3D prints of their heads right then and there, otherwise we’ll use BotQueue to queue up bigger prints that we can mail or hand deliver later.

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I started work on the schematics for the trike – it obviously needs to support some 3D printers, but it also needs some pizazz in the form of leds, dubstep, and possibly lasers. It should be pretty easy to hook all of this up – the trike has a huge compartment for holding the batteries and all this other stuff, and I’ve added LEDs + a sound system to my other bike already.

I’ll try to post pics and videos of the build process and eventual running of the show if anyone is interested.


Blinkyboard + China Pollution Data = Win


My buddies Matt and Max have designed a sweet board called the Blinkyboard. It fits nicely into an addressable LED strip and allows you to easily control it. The board itself is Arduino compatible which makes working with this whole thing super easy.

I wanted to play around with it, but also make something useful. I live in Shenzhen, China where pollution can sometimes be an issue. Normally, I’ll check the site which has detailed pollution status for hundreds of cities in China. They have a gorgeous color-coded graph that I thought would be very nice if it was represented on an LED strip.

Songgang, Shenzhen AQI, PM2.5 Real-time Air Pollution Index

The Blinkyboard strip has individually controllable LED pixels, and the Air Quality site has a graph with a different color for each hour. I wrote a simple python script that takes the image, samples the color at each point, and then pushes that color to the LED strip. It was ridiculously easy to setup and the result was very nice. Now I have a simple, ambient, and colorful indication of what the pollution level is. The strip below is Beijing, which is much more polluted than Shenzhen, so the LED strip is a bit prettier, haha.

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Meet a Shenzhen Maker: Mr. Chen

I’ve been living in Shenzhen for almost 2 years now, and I’m continually amazed by this city. The people here are creative, it has the best resources for building things you can find anywhere in the world, an amazing climate, and friendly people everywhere. This is the story of one particular Maker I’ve met in Shenzhen, Mr. Chen.


In my ongoing obsession with digital fabrication and small volume manufacturing, I stumbled upon the Chinese SMT Pick and Place scene. It started with the TM-240A that I found on Taobao and through that I discovered www.diysmt. om and It turns out there are a bunch of people building and using low-cost pick and place machines for actual production of real products. I had to find out more.


I used my super-crappy chinese skills and posted in the diysmt forum to see if anyone was local to Shenzhen and could show me their machine. I got a couple responses, and Mr. Chen agreed to meet me and show me his operation. Always down for an adventure, I agreed and got his address. My assistant/translator and I hopped in a taxi and away we went.

We arrived in a neighborhood on the outskirts of Shenzhen – the type with small alleys separating dozens of dusty apartments with stray dogs running around and open-air grocery stores selling meat on hooks. If you’ve ever been to China an ventured off the beaten track, you’ll know exactly what its like.


Entering into Mr. Chen’s place, you feel like you’re stepping into a whole new world. His apartment was immaculate, but signs of making were there if you know what to look for. Tucked away in one corner was the pick and place machine that I came to see. Next to it was a coffee table with boards ready to be populated, surrounded by tea cups.


After a round of tea, he showed me the machine in operation. This $4000 pick and place machine was awesome to see. He had about 16 feeders and was populating entire boards in a single go. Between snapping pics and taking video, I asked him about what he does with it and why he needs gear like this.

It turns out, Mr. Chen was more interesting than his machine! You see, he’s managed to carve our a nice little niche for himself by designing and manufacturing his own electronics and then selling them at the infamous Huaqiangbei electronics market. He started about 7 years ago and has been building and selling various things during that whole time. Today he was making AVR ICE programmers, but tomorrow he might build controllers for the fans for his brothers small DC fan factory.

As we got to talking about making and DIY culture, I began to get a sense that this down-to-earth guy was someone who really understands the so-called Maker culture. He was very business savvy, and even had a slogan: 花小钱,赚大钱 which roughly means spend less and earn more. What he was describing was a lean operation where he had digital fabrication tools that allowed him to retool and switch around really quickly and efficiently. His house was doubling as his production floor so he had very little overhead. He also understood that he needed to find niche markets in order to remain competitive.


His setup was slick and efficient: order pcbs + stencils from a fab, apply solder paste using a clever fixture, use the pick-n-place machine to get the parts on the board, reflow everything in his smt oven, and then hand-solder the connectors. The solder paste fixture itself was rather brilliant. The stencil itself was attached to a hinged lid. He took a sacrificial pcb, hand aligned it with the stencil, and then glued it in place. He then took 2 header pins and nailed them into a connector hole until just a small nub was sticking out. These pins then became the alignment pins for the pcb to apply solder to. Brilliant, cheap, and effective.


I complimented him on his self reliance and was surprised by yet another twist that would be enough to turn any urban farm-loving hipster green with jealousy. In addition to running his own electronics manufacturing operation, Mr. Chen was growing organic vegetables, and raising chickens and pidgeons on the roof of his apartment! This guy was the picture of self reliance, and he had a relaxed attitude that told me immediately that he had carved out a cozy existence in his life with his wife, son, pidgeons, and electronics. Watching the flock of pidgeons flying freely through the sky on a sunny winter afternoon, it was easy to see why.


All in all, it was a lovely afternoon and I feel like I’ve come closer to understanding the impenetrable culture of Shenzhen makers. To all the Mr. Chen’s of the world out there, and anyone else who pursues the goal of self-employment through making, I salute you!