Nodemcu V0.8 Specs ESP8266 with 4MB flash memory, ceramic antenna Pinout 1 2 ADC IO16 RSV IO5 RSV IO4 RSV IO0 RSV IO2 RSV 3.3V RSV GND GND IO14 3.3V IO12 GND IO13 3.3V IO15 EN RX RST TX GND GND 5V 3.3V