Thanks in advance,
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g6ejd wrote:The espressif data sheet does not give a specification but it says all inputs have a leakage current to maintain an input state of 50nA and you should expect input impedance of any ADC to be high. using 50nA and 1volt maximum input allowed yields 20Mohm which sounds about right to me.
However which ESP8266 implementation are you using because many boards like NodeMCU or WemoS D1 have input resistor diver chains to allow 0-5 inputs and effectively divide that input range down to 0-1volt for the ESP, in which case the input impedance of these boards would be much lower. The Wemos D1 mini for example has a 220K and 100K series divider giving you an input impedance of < 100Kohm.
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