81 lines
1.9 KiB
C++
81 lines
1.9 KiB
C++
/* --------------------------------------
|
|
* 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
|
|
*
|
|
* 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>
|
|
|
|
|
|
void setup()
|
|
{
|
|
Wire.begin();
|
|
|
|
Serial.begin(9600);
|
|
while (!Serial); // Leonardo: wait for serial monitor
|
|
Serial.println("\r\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
|
|
}
|