I’m pleased to see a new product over at ThinkGeek, who are now offering the LittleBits Kits for electronics prototyping and learning. The kit has various sensors surface mounted with standardised connectors, which snap together magnetically. They are positioned for 7-13 year olds as well as hobbyists and newbies to electronics.
It’s clear that their ease of use greatly hides the detail of what’s going on electronically. For beginning learners this is good, as you can get straight to the payoff – I put a few bits together and wow!, I can build a touch-activated LED. This allows for easy trial-and-error testing, asking questions, exploring possibilities. And it can spawn further inquiry into what is actually going on electronically. It is one level of abstraction higher from, say, an Arduino, which would be an obvious choice for people who would like to take their learning a LittleBit further (sorry, couldn’t resist…not in my capacity…oof!). Incidentally, we created a similar kit with the Arduino team, at TinkerLondon, without magnetic connectors, though. The pricepoint is a little high for all but the most enthusiastic geekdads and will likely price LittleBits out of many school budgets. However, for those who are able to splurge, it makes a welcome addition to the toolset for learning.
For Design prototyping, LittleBits’ main limitation will be that the mounting of the components on boards limits how these pieces can be placed into a physical housing, and in fact, the main idea is to support learning and experimentation, rather than testing out interactivity. However, I can see a compelling case for adding this to the Design Studio trolley of raw materials for exploration and design ideation. I’ll be even more excited to locate a UK distributor!
Recently, as part of an iPhone development project I’ve been working on with the Institute of Zoology and Birkbeck, I had a need for an audio line in adapter so that we’d be able to record stereo audio from an audio sensor. The application tags audio data with GPS information as part of a citizen-scientist data collection project.
Strangely (or perhaps I didn’t dig around the interweb long enough) I didn’t find many resources for a home-brew line-in adapter and the ones I found were pretty vague and hard to follow. So Peter and I put our heads together and rolled our own. It’s a fairly straightforward circuit, but has a little twist, because the iPhone OS is smart enough to detect what’s plugged into the stereo jack. (The diagram above is a lot more clear than anything I found.) This particular project only required a left channel audio input to the monaural iPhone mic, but if you wanted to route both left and right channels to the mic, that’s represented by the dashed line.
The resistor+capacitor network provides a pull-up that the iPhone is looking for to detect whether you’ve got a standard stereo headset plugged in or whether you’ve got a microphone (i.e., iPhone) headset and can take a phone call with it. This particular circuit is tuned for the audio sensor we’ve been using, but is about the right spec for most audio recording purposes and works fine with the audio recording app that ships with the iPhone. The parts cost about £3 and I whipped one up in about 10 minutes!
Sometimes, the ideal little package comes along and you don’t have to do all the hard work fabricating a physical user interace. While working on the Spot-On project at LKL, I found a very nify little “finger torch” that solves the problem of powering up an LED in a small form factor. This little guy’s is perfect for retrofitting with an LD271 infrared emitter, for Wiimote hacking, IR Motion tracking, and generally mucking about moving around infrared sources, for you Johnny Lee fans. This package combines 3 button cells, a switch and an LED into a tight little case with a hook-and-loop strap. Not sure if it’s emitting continuously or in pulses (PWM) but there’s a microcontroller under that resin blob (pic 2), so it seems likely. A little de/re-soldering and, you’ve got yourself a perfect finger-mounted IR pointer!
Last year at Dorkbot London I gave a demonstration of the Brockenspiel and fielded a few questions afterwards. Some clever guy in the audience asked if I could hook up a bar code reader – a thought I’d had but not implemented. When I said it would probaly work just fine, as long as the serial protocol is the same, someone in the audience called out “Hang on a minute, I’ve got a barcode reader around here!” (Only at Dorkbot!) Hidden in the depths of Limehouse Town Hall, he hauled out the reader, and by a stroke of luck, it worked. We were playing the music on beer bottles in a matter of minutes. Later, I made a quick video to demonstrate the concept.
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