IoT Tutorial for ESP8266
Increase Analog Pins for NodeMCU using 16-Channel Analog Multiplexer Module – A blog about DIY solar and arduino projects
Increase the Number of Analog Inputs with an Analog Multiplexer
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Reference — ESP8266 Arduino Core 3.1.1-21-g32323e55 documentation
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ESP8266 ADC - Read Analog Values with Arduino IDE, MicroPython and Lua | Random Nerd Tutorials
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Increase the Number of Analog Inputs with an Analog Multiplexer
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NodeMCU ESP8266 Vs. Arduino UNO Board - Makerguides.com
ESP8266 ADC - Multiple Analog Sensors : 3 Steps - Instructables
NodeMCU v2 and v2.1 high resolution pinout and specs – Renzo Mischianti
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