Here’s a handy guild on how to build your own DIY Resistor Substitution Decade Box. I had seen several people online building their own, but instructions weren’t very clear. Hopefully these 50 or so pictures will help. First step – hop onto ebay, and pick up some switches. You can find them by searching for “decimal thumbwheel switch” – I think I only paid $5 for 10 of them including shipping (from china). Order up some extras – they can be used for all sorts of things – and a fun part to keep around.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.