AM2322 - Projekte

// --------------------------------------

    // i2c_scanner

    //

    // Version 1

    //    This program (or code that looks like it)

    //    can be found in many places.

    //    For example on the Arduino.cc forum.

    //    The original author is not know.

    // Version 2, Juni 2012, Using Arduino 1.0.1

    //     Adapted to be as simple as possible by Arduino.cc user Krodal

    // Version 3, Feb 26  2013

    //    V3 by louarnold

    // Version 4, March 3, 2013, Using Arduino 1.0.3

    //    by Arduino.cc user Krodal.

    //    Changes by louarnold removed.

    //    Scanning addresses changed from 0...127 to 1...119,

    //    according to the i2c scanner by Nick Gammon

    //    http://www.gammon.com.au/forum/?id=10896

    // Version 5, March 28, 2013

    //    As version 4, but address scans now to 127.

    //    A sensor seems to use address 120.

    // Version 6, November 27, 2015.

    //    Added waiting for the Leonardo serial communication.

    //

    //

    // This sketch tests the standard 7-bit addresses

    // Devices with higher bit address might not be seen properly.

    //

    #include <Wire.h>

    void setup()

    {

      Wire.begin();

      Serial.begin(9600);

      while (!Serial);             // Leonardo: wait for serial monitor

      Serial.println("\nI2C Scanner");

    }

    void loop()

    {

      byte error, address;

      int nDevices;

      Serial.println("Scanning...");

      nDevices = 0;

      for(address = 1; address < 127; address++ )

      {

        // The i2c_scanner uses the return value of

        // the Write.endTransmisstion to see if

        // a device did acknowledge to the address.

        Wire.beginTransmission(address);

        delay(1);

        error = Wire.endTransmission();

        if (error == 0)

        {

          Serial.print("I2C device found at address 0x");

          if (address<16)

            Serial.print("0");

          Serial.println(address,HEX);

          Serial.println(address);

          Serial.println("  !");

          nDevices++;

        }

        else if (error==4)

        {

          Serial.print("Unknown error at address 0x");

          if (address<16)

            Serial.print("0");

          Serial.println(address,HEX);

        }

        delay(2);

      }

      if (nDevices == 0)

        Serial.println("No I2C devices found\n");

      else

        Serial.println("done\n");

      delay(5000);           // wait 5 seconds for next scan

    }