I believe the ESP8266 A>D is used for RSSI readings from the RF stage when Scan AP mode is operative! and ReadVCC.
Dans
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hwiguna wrote:@tytower,
Let me see if I could shed some light on the ESP's ADC pin.
1) The Arduino reports a range of 0 to 1023 to correspond with 0V to 5V. The ESP reports 0-1023 to correspond with 0V to 3.3V. This is just the way the chip was designed, no way to change it.
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