This mini WiFi board has 16 MB flash, external antenna connector and built-in ceramic antenna based on ESP8266EX. Features 11 digital input/output pins Interrupt/pwm/I²C/one-wire 1 analog input (3.2 V max input) 16 MB Flash External antenna connector Built-in ceramic antenna CP2104 USB-TO-UART IC Specifications Operating Voltage 3.3 V Digital I/O Pins 11 Analog Input Pins 1 (3.2 V max) Clock Speed 80/160 MHz Flash 16 MB Size 34.2 x 25.6 mm Weight 3 g Pin Configuration Pin Function ESP8266 Pin RX RXD RXD A0 Analog input, max 3.2 V A0 D0 IO GPIO16 D1 IO, SCL GPIO5 D2 IO, SDA GPIO4 D3 IO, 10k Pull-up GPIO0 D4 IO, 10k Pull-up, BUILTIN_LED GPIO2 D5 IO, SCK GPIO14 D6 IO, MISO GPIO12 D7 IO, MOSI GPIO13 D8 IO, 10k Pull-down, SS GPIO15 G Ground GND 5V 5 V - 3V3 3.3 V 3.3 V RST Reset RST Included 1x WeMos D1 mini Pro (based on ESP8266EX) 2x Pin header (short) 2x Female connector strip (short) 2x Female connector strip (long)

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