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Adafruit Feather 32u4 Bluefruit LE has an Atmega32u4 (same as Arduino), LiPoly charger and BTLE built in for $30. I'm cheap, so soon I'm going to have a go at
by brokenmachine 10y ago
Adafruit Feather 32u4 Bluefruit LE has an Atmega32u4 (same as Arduino), LiPoly charger and BTLE built in for $30.
I'm cheap, so soon I'm going to have a go at reflashing a $3 HC06 module with the RN-42 firmware [1], and using that with a $3 Arduino Pro Micro and a $1 TP4056 Charger board for the same capabilities but messier. I always learn more by messing around though.
[1] https://mitxela.com/projects/bluetooth_hid_gamepad https://mitxela.com/projects/bluetooth_hid_gamepad