I2C Scan 35

Find I2C device addresses for sensors, displays, and expanders.

/*
  Roboda verified Arduino sample 0859
  Feature: I2C Scan
  Generated for online build, classroom practice, and hardware upload testing.
*/

#include <Wire.h>

void setup() {
  Wire.begin();
  Serial.begin(9600);
}

void loop() {
  for (byte address = 1; address < 127; address++) {
    Wire.beginTransmission(address);
    if (Wire.endTransmission() == 0) {
      Serial.print("I2C device at 0x");
      Serial.println(address, HEX);
    }
  }
  delay(3000);
}

How it works

Discover I2C addresses on the board SDA/SCL bus.

1. Wire SDA and SCL using the board-specific map.
2. Share GND between all I2C devices.
3. Run the scanner and open Serial Monitor.
4. Use the printed address in later sensor/display sketches.

Connections