Nodemcu V1.0 Specs ESP8266 with 4MB flash memory, ceramic antenna Pinout 1 2 ADC IO16 RSV IO5 RSV IO4 IO10 IO0 IO9 IO2 MOSI 3.3V CS GND MISO IO14 CLK IO12 GND IO13 3.3V IO15 EN RX RST TX GND GND 5V 3.3V