This vest uses a ‘nixie’-like numeric display system to show the speed of the cyclist. It seems that the builders used the hall effect sensor from a bikecomputer to calculate the RPMs on an Arduino and then turn that into MPH which is displayed using triacs (im kinda guessing here)
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.
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