I used the 2 large photoresistors that come in this pack for Red and Blue and the medium for green.
#LITTLE BITS CODING FULL#
Parts list: 1) Perf board cut to 9 x 12 full holes 2) LED: 5mm tricolor (red/blue/green) - Radio Shack part #2760028 3) Resistors: 3 x 330 ohm (220 ohm may suffice - test it on a breadboard first), 3 x Cds photocells (photoresistors) - Radio Shack part #276-1657.
The most important tool is a good book I recommend Timer, Op Amp & Optoelectronic Circuits & Projects by Forrest M. For labeling bits, I use #6 plastic from the recycling bin (also sold as shrink film by Tools required include wire stripper, soldering gun, helping hands, needle nose plyers, hot glue gun, and a method for cutting perfboard (I scored it with a sharp knife and snapped it over a straight edge ruler, but some prefer to use a dremel). EDIT: I have learned from electrical engineers that it is better to use a rail-to-rail op amp, such as the TLV2462 available at Adafruit - please adjust pin numbers based on the white paper of the op amp you use. I recommend buying larger quantities of chips from The Digikey part number for the LM741 op amp chip is LM741CNNS/NOPB-ND at publication time, I was able to buy this chip for $0.70. Many bits require an op amp chip, which can get pricey if you are buying them individually from the store. PARTS: If not stated in each individual step, you will need solder, hot glue, 22 gauge stranded insulated wires, perfboard, male (maybe also female as you like) pins, jumper wires, heat shrink tubing (electrical tape is ugly but will suffice), and a method for labeling your DIY bits. If you decide do use alternating male and female pins and jumpers, then the male header pins should be on the left of the bits this is to prevent dangling live male jumper wires from crossing each other and creating a short circuit. One idea is to use alternating male and female pins on alternating sides with male to female color coded jumper wires (red=+VCC, green=signal, black = GND). There is no kanban mechanism to prevent miswiring, so the user must be careful when connecting DIY bits.
The connection method I currently use between bits involves 3 header pins on both the left and right sides and female to female jumper wires.
#LITTLE BITS CODING FREE#
I volunteer for the Fresh Air Fund, and my hope is that I can learn enough to offer a free afternoon workshop this summer for the children who visit my town just 45 minutes north of NYC. * Added since initial publication: light trigger* I change the original circuits based on parts availability and my own preferences and ability. Let's make DIY littleBits! For original circuits, visit
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