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I2C Scanner

This very simple sketch scans the I2C-bus for devices. If a device is found, it is reported to the Arduino serial monitor.

Code

 

#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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