What is the lowest voltage that a microcontroller can successfully read on the analog pin?

Published: 20/09/2019
What is the lowest voltage that a microcontroller can successfully read on the analog pin?
Source: ELECTRONICS.STACKEXCHANGE.COM

I'm testing the Seeeduino v4.2 board with the ADCInOutSerial code in the Arduino IDE and the lowest voltage the board can read is 18 mV , showing an equivalent ADC of 4 on the serial monitor. The chip that the board uses is the ATmega328P . It works on a 5 V power supply and has a 10-bit ADC (1024 levels), so the voltage that I calculated for an ADC level of 1 is, 5/1024 = x/1, where x

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