Starting with an off-the-shelf Nike + iPod transmitter [top], I removed and modified the circuit board [second from top]. I constructed a receiver from an Arduino Pro Mini microcontroller and a Nordic radio chip [second from bottom]. Then I repackaged the transmitter to make it easy to replace its battery and switch it on and off [bottom].
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Python for Microcontrollers – Adafruit Daily — Python on Microcontrollers Newsletter: A New Arduino MicroPython Package Manager, How-Tos and Much More! #CircuitPython #Python #micropython @ThePSF @Raspberry_Pi
EYE on NPI – Adafruit Daily — EYE on NPI Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey