Adafruit’s Gemma, a very nice platform a little over an inch in diameter, is ideal for small and wearable projects. The device is inexpensive and based on the ATTINY85 microcontroller. Adafruit has, once again, done an excellent job of designing a cool tool for the electronics hobbyist.
Small as this is, I found myself wanting to shrink the electronics footprint of a wearable circuit even more. I didn’t have a need for some of the Gemma extras such as USB connector or JST for LiPo battery. So, I decided to experiment a little to get a wearable circuit to the bare essentials.
I already had in my toolkit the Adafruit USBtinyISP programmer, and the Evil Mad Scientist ’2313 Target Board with ZIF socket. This board has a simple jumper modification to allow it to be used with ATTINY45/85.
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