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This is a fork of the ArduinoISP sample project to support using the common Pro Micro 32u4 boards (like this from SparkFun) as an ISP programmer. Compile this and download to a Pro Micro with 32u4 ...
This project implements an Atmel In System Programmer (ISP) programmer using only a low cost (≈$5-$17) Pro Micro (Sparkfun DEV-12640 or equivalent clone) (or Leonardo) module with an ATMega32U4 ...