I2C device scanner

In case you do not know exactly the address of I2C driver, you can use I2C_scanner to detect the address of device connected to SDA and SCL


/*
 * I2C address scanner
 */
 
#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);
 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("Unknown 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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