This PCB can program several ATTiny chips trough ISP using an Arduino Nano with the ISP program. There is not much documentation on the board, it is a straight forward design. The nice thing about this board is that it can program the ATTiny25, ATTiny45, ATTiny85, the ATTiny24,ATTiny44,ATTiny84 and the ATTiny2313 and ATTiny4313 chps. Information in using an Arduino Nano as ISP can be found here: https://forums.4fips.com/viewtopic.php?t=1080 https://elecena.pl/product/27512742/arduino-nano-as-isp-pcb 2024-12-19 https://elecena.pl/product/27512742/arduino-nano-as-isp-pcb 2025-01-16