Help with Ph sensor pin abbreviations

Using Arduino Sensors
9

Do you mean this:-

// pHRead.ino

// Constants:-
const byte pHpin = A0;    // Connect the sensor's Po output to analogue pin 0.

// Variables:-
float Po;

void setup()
{
    Serial.begin(115200);
}

void loop()
{
    Po = 1023 - analogRead(pHpin);  // Read and reverse the analogue input value from the pH sensor.
    Po = map(Po, 0, 1023, 0, 14);   // Map the '0 to 1023' result to '0 to 14'.
    Serial.println(Po);             // Print the result in the serial monitor.
    delay(1000);                    // Take 1 reading per second.
}

Reverses the analog pin input reading from '1023 to 0' to '0 to 1023', maps it between 0 and 14, then prints it to the serial monitor.
An input of 511 is neutral and will return 7.

Edit: I should add that when writing this I was assuming that the range of the pH sensor is 14. I'm fairly sure that's right.
(And I made a silly mistake at first, but all fixed now. :slight_smile: )