Read more than one analog voltage with the ESP8266 using the I2C MCP3021 ADC converter breakout board.
ADC Board:
https://www.tindie.com/products/AllAb...
GitHub Repository:
https://github.com/AllAboutEE/ESP8266...
Software Libraries:
https://github.com/AllAboutEE/ESP8266...
How To Flash NodeMCU to ESP8266:
• ESP8266 How To Flash NodeMcu Firmware