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BLANTERWISDOM101

I2C address scanner arduino

Wednesday, November 8, 2017




   #include <Wire.h>


    void setup()
    {
    Wire.begin();
    Serial.begin(9600);
    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);
    error = Wire.endTransmission();
    if (error == 0)
    {
    Serial.print("I2C device found at address 0x");
    if (address<16)
    Serial.print("0");
    Serial.print(address,HEX);
    Serial.println(" !");
    nDevices++;
    }
    else if (error==4)
    {
    Serial.print("Unknow error at address 0x");
    if (address<16)
    Serial.print("0");
    Serial.println(address,HEX);
    }
    }
    if (nDevices == 0)
    Serial.println("No I2C devices found\n");
    else
    Serial.println("done\n");
    delay(5000); // wait 5 seconds for next scan
    }


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