// --------------------------------------
// 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
// Gammon Forum : Electronics : Microprocessors : I2C - Two-Wire Peripheral Interface - for Arduino
// 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>
// Pin definitions
const int Blue = 23;
const int Green = 27;
const int Yellow=32;
const int Red=33;
void setup()
{
Wire.begin();
Wire.setTimeout(100);
Wire.setClock(16000);
// Initialize pins as outputs
pinMode(Blue, OUTPUT);
pinMode(Green, OUTPUT);
pinMode(Yellow, OUTPUT);
pinMode(Red,OUTPUT);
// Set initial state to LOW
digitalWrite(Blue, LOW);
digitalWrite(Green, LOW);
digitalWrite(Yellow,LOW);
digitalWrite(Red,LOW);
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(5);
error = Wire.endTransmission();
delay(5);
if (error == 0)
{
Serial.print("I2C device found at address 0x");
if (address<16)
Serial.print("0");
Serial.print(address,HEX);
Serial.println(" !");
digitalWrite(Green, HIGH);
nDevices++;
}
else if (error==4)
{
Serial.print("Unknown error at address 0x");
if (address<16)
Serial.print("0");
Serial.println(address,HEX);
digitalWrite(Red,HIGH);
}
}
if (nDevices == 0)
Serial.println("No I2C devices found\\n");
else
Serial.println("done\\n");
Serial.printf("Current I2C clock: %lu Hz\\n", Wire.getClock());
delay(500); // wait 0.5 seconds for next scan
digitalWrite(Red,LOW);
digitalWrite(Green,LOW);
}
