Browse Source

Add I2C device scanner

master
Starbeamrainbowlabs 4 years ago
parent
commit
fd6fa2fe44
  1. 81
      I2cScanner/I2cScanner.ino

81
I2cScanner/I2cScanner.ino

@ -0,0 +1,81 @@
/* --------------------------------------
* 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("\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
}
Loading…
Cancel
Save