85 lines
2.4 KiB
Arduino
85 lines
2.4 KiB
Arduino
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// --------------------------------------
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// i2c_scanner
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//
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// Version 1
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// This program (or code that looks like it)
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// can be found in many places.
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// For example on the Arduino.cc forum.
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// The original author is not know.
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// Version 2, Juni 2012, Using Arduino 1.0.1
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// Adapted to be as simple as possible by Arduino.cc user Krodal
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// Version 3, Feb 26 2013
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// V3 by louarnold
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// Version 4, March 3, 2013, Using Arduino 1.0.3
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// by Arduino.cc user Krodal.
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// Changes by louarnold removed.
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// Scanning addresses changed from 0...127 to 1...119,
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// according to the i2c scanner by Nick Gammon
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// http://www.gammon.com.au/forum/?id=10896
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// Version 5, March 28, 2013
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// As version 4, but address scans now to 127.
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// A sensor seems to use address 120.
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// Version 6, November 27, 2015.
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// Added waiting for the Leonardo serial communication.
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//
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//
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// This sketch tests the standard 7-bit addresses
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// Devices with higher bit address might not be seen properly.
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//
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#include <Wire.h>
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void setup()
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{
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Wire.begin(D3, D4);
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Serial.begin(9600);
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while (!Serial); // Leonardo: wait for serial monitor
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Serial.println("\nI2C Scanner");
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}
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void loop()
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{
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byte error, address;
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int nDevices;
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Serial.println("Scanning...");
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nDevices = 0;
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for(address = 1; address < 127; address++ )
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{
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// The i2c_scanner uses the return value of
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// the Write.endTransmisstion to see if
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// a device did acknowledge to the address.
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Wire.beginTransmission(address);
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error = Wire.endTransmission();
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if (error == 0)
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{
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Serial.print("I2C device found at address 0x");
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if (address<16)
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Serial.print("0");
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Serial.print(address,HEX);
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Serial.println(" !");
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nDevices++;
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}
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else if (error==4)
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{
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Serial.print("Unknown error at address 0x");
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if (address<16)
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Serial.print("0");
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Serial.println(address,HEX);
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}
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}
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if (nDevices == 0)
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Serial.println("No I2C devices found\n");
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else
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Serial.println("done\n");
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delay(5000); // wait 5 seconds for next scan
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}
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