i2c-scanner.cpp

// --------------------------------------
// i2c_scanner
//
// http://playground.arduino.cc/Main/I2cScanner
//
// 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.
//
//
// This sketch tests the standard 7-bit addresses
// Devices with higher bit address might not be seen properly.
//

#include "Particle.h"

void setup()
{
	Wire.begin();

	Serial.begin(9600);
	delay(10000);
	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
}