Arducam ESP8266 UNO Board and OV2640 Mini Module Camera Shield Compatible with Arduino UNO R3 ESP8266 UNO based Arduino board for Arducam mini camera modules while keeping the same form of factors and pinout as the standard Arduino UNO R3 board Build in ESP8266-12E Module Interface specially designed for Arducam mini module camera shield, and OV2640 Arducam Mini Module Camera Shield is included 11 digital input/output pins, IO ports are 3.3V tolerant 1 analog input(3.2V max input)