EnviroDIY Mayfly Data Logger Board, Arduino Compatible Fully programmable microprocessor board, compatible with the Arduino IDE software Atmega 1284p processor, 128K flash memory and 16K RAM 24 digital I/O pins, and 8 analog pins, plus a 4-channel 16-bit analog-to-digital converter Realtime Clock chip, microSD card slot, Bee RF module socket, and solar battery charging capability