Arduino nano input of analog pin is always 1

Other Hardware General Electronics
25

Before I posted reply #16, I did a little test to verify that what I was saying was correct.

I modified gonanf_2's code to print out the value of 'R', as well as a message to say ', R == HIGH' if the condition (R == HIGH) was met.

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(A0, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:

  int R = analogRead(A0);
  Serial.print(R);
  Serial.print("");
  if (R == HIGH) {
    Serial.print(", R == HIGH");
  }
  Serial.println();
  delay(10);
}

and here are the results:

image
image712×690 25.2 KB

The message ', R == HIGH' is only printed when R = 1.

I won't bother showing the other 970 or so values of R that don't print the message ', R == HIGH'.

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