while esp8266-adc-reading-analog-values-with-nodemcu saysPlease note that this input can only tolerate a maximum of 1.0 volts
if so, is it better to mention the later one in 8. Analog to Digital Conversion?The ESP8266 ADC pin input voltage range is 0 to 1V if you’re using the bare chip. However, most ESP8266 development boards come with an internal voltage divider, so the input range is 0 to 3.3V. So, in sumary:
-ADC Voltage range in ESP8266 development boards: 0 to 3.3V (for example: ESP8266 12-E NodeMCU Kit, WeMos D1 Mini, …)
-ADC Voltage range in ESP8266 chip: 0 to 1V (for example: ESP-07 chip, ESP-12E chip, …)