ESP8266 NodeMCU pinMode Diagram: https://github.com/thehookup/Wireless_MQTT_Doorbell/blob/master/PinModes_ESP8266_NodeMCU.jpg

ESP32 NodeMCU Pin Diagram: https://github.com/thehookup/ESP32_Ceiling_Light/blob/master/PinModes_ESP32_NodeMCU.jpg

Buy an ESP8266 NodeMCU: https://amzn.to/2K0hgjS
Buy an ESP32 NodeMCU: https://amzn.to/2JVgEvx

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