AnalogMillivolts.ino

Prints the voltage on every analog pin, in millivolts, once a second, and the full scale of each pin at start-up.

A0-A2 (RP2040 ADC) read 0-3300 mV and A3-A5 (on-board MAX11635) read 0-2048 mV; analogReadMillivolts() and analogFullScaleMillivolts() handle the difference, so the same code works on every pin.

Output

Serial Monitor at 115200 baud, for example:

A0 1650 mV   A1 3 mV   A2 0 mV   A3 1024 mV   A4 0 mV   A5 0 mV

// Prints the voltage on every analog pin, in millivolts, once a second.
// A0-A2 (RP2040 ADC) read 0-3300 mV and A3-A5 (on-board MAX11635) read
// 0-2048 mV; analogReadMillivolts() handles the difference, so the same code
// works on every pin.
 
const pin_size_t PINS[] = {A0, A1, A2, A3, A4, A5};
const char* const NAMES[] = {"A0", "A1", "A2", "A3", "A4", "A5"};
 
void setup() {
    Serial.begin(115200);
    while (!Serial) {}
 
    Serial.println("Full scale of each pin:");
    for (int i = 0; i < 6; i++) {
        Serial.print(NAMES[i]);
        Serial.print(": ");
        Serial.print(analogFullScaleMillivolts(PINS[i]));
        Serial.println(" mV");
    }
}
 
void loop() {
    for (int i = 0; i < 6; i++) {
        Serial.print(NAMES[i]);
        Serial.print(" ");
        Serial.print(analogReadMillivolts(PINS[i]));
        Serial.print(" mV   ");
    }
    Serial.println();
    delay(1000);
}