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Description: The ATMega32U4 is Atmel’s low-power 8-bit AVR RISC-based microcontroller featuring 32KB self-programming flash program memory, 2.5KB SRAM, 1KB EEPROM, USB 2.0 full-speed/low speed device, 12-channel 10-bit A/D-converter, and JTAG interface for on-chip-debug.
This is the same controller that’s used on the Pro Micro and Fio v3.
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I used this part on a “poor mans Thermal Imager” I am working on. If you set it up it works pretty good. The embedded USB needs an extra driver but the arduino IDE handles that.
Also if your using a separate Terminal program (I rolled my own in VB.net) make sure to enable DTR to receive data (DTR.enable = True)