Analog Sensor Read 21

Sample potentiometers, light sensors, thermistors, and analog robot signals.

/*
  Roboda verified Arduino sample 0503
  Feature: Analog Sensor Read
  Generated for online build, classroom practice, and hardware upload testing.
*/

const byte sensorPin = A2;
const int threshold = 540;

void setup() {
  Serial.begin(9600);
  pinMode(13, OUTPUT);
}

void loop() {
  int value = analogRead(sensorPin);
  digitalWrite(13, value > threshold ? HIGH : LOW);
  Serial.print("analog=");
  Serial.println(value);
  delay(360);
}

How it works

Read a variable analog voltage and compare it with a threshold.

1. Connect the sensor output to the listed analog pin.
2. Connect sensor VCC and GND to the board.
3. Open Serial Monitor to see raw 0-1023 values on AVR boards.
4. Adjust threshold for your sensor range.

Connections