ESP8266 NodeMCU Pin Diagram: https://github.com/thehookup/Wireless_MQTT_Doorbell/blob/master/GPIO_Limitations_ESP8266_NodeMCU.jpg

ESP32 NodeMCU Pin Diagram: https://github.com/thehookup/ESP32_Ceiling_Light/blob/master/GPIO_Limitations_ESP32_NodeMCU.jpg

The ESP32 Pins Outputting a PWM signal at startup that had duty cycles low enough that they didn't trigger the relay were: P14, P5, P0, P15, P8, P7, and P6.

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

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