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The ESP is a 3.3v device. If your Uno is a 5v device, its A/D converter can measure and report voltages from 0 to 4.9878v (5v minus 1 LSB). If the same signal is presented to the ESP, any value above 3.29919 volts (3.3v - 1 LSB) will read as 4095, i.e., out of range. (If this isn't your issue, adding wiring diagrams of each system to your question will help ...


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The ADC is a "Successive Approximation" type ADC. It works by: Taking a snapshot of the incoming voltage in a small capacitor Generating a reference voltage Comparing the voltage in the capacitor to that reference voltage Refining the reference voltage Go back to 3 until you have the accuracy you desire. There's lots of "time" involved there: The ...


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First, let me give a couple of suggestions on the programming style. There is no point in defining your own variables for accessing the hardware registers: the avr-libc does that for you, you just have to #include <avr/io.h>. Actually, you don't have to #include anything: the Arduino IDE automatically #includes Arduino.h, which in turn #includes avr/io....


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