Use this forum to chat about hardware specific topics for the ESP8266 (peripherals, memory, clocks, JTAG, programming)

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By latki8
#71962 Just following the conversation, if its of any interest I only have one esp8266 so not a great sample, but I found the ADC pin to be very linear in its response along with an offset voltage. My sample follows this formula: adc = 0.973 * mV - 82, ie: its 0 until 82mv and then linear until 1024 at 1136mv upwards. I use SPI or I2C ADC chips usually. A document marked 'confidential' referenced by someone earlier states that the IO pins are protected against over-voltage but i've not tried increasing the voltage on ADC above 1.2v.