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| 1 | +// -------------------------------------- |
| 2 | +// i2c_scanner |
| 3 | +// |
| 4 | +// Version 1 |
| 5 | +// This program (or code that looks like it) |
| 6 | +// can be found in many places. |
| 7 | +// For example on the Arduino.cc forum. |
| 8 | +// The original author is not know. |
| 9 | +// Version 2, Juni 2012, Using Arduino 1.0.1 |
| 10 | +// Adapted to be as simple as possible by Arduino.cc user Krodal |
| 11 | +// Version 3, Feb 26 2013 |
| 12 | +// V3 by louarnold |
| 13 | +// Version 4, March 3, 2013, Using Arduino 1.0.3 |
| 14 | +// by Arduino.cc user Krodal. |
| 15 | +// Changes by louarnold removed. |
| 16 | +// Scanning addresses changed from 0...127 to 1...119, |
| 17 | +// according to the i2c scanner by Nick Gammon |
| 18 | +// https://www.gammon.com.au/forum/?id=10896 |
| 19 | +// Version 5, March 28, 2013 |
| 20 | +// As version 4, but address scans now to 127. |
| 21 | +// A sensor seems to use address 120. |
| 22 | +// Version 6, November 27, 2015. |
| 23 | +// Added waiting for the Leonardo serial communication. |
| 24 | +// |
| 25 | +// |
| 26 | +// This sketch tests the standard 7-bit addresses |
| 27 | +// Devices with higher bit address might not be seen properly. |
| 28 | +// |
| 29 | + |
| 30 | +#include <Wire.h> |
| 31 | + |
| 32 | +void setup() { |
| 33 | + Wire.begin(); |
| 34 | + |
| 35 | + Serial.begin(9600); |
| 36 | + while (!Serial); // Leonardo: wait for serial monitor |
| 37 | + Serial.println("\nI2C Scanner"); |
| 38 | +} |
| 39 | + |
| 40 | +void loop() { |
| 41 | + int nDevices = 0; |
| 42 | + |
| 43 | + Serial.println("Scanning..."); |
| 44 | + |
| 45 | + for (byte address = 1; address < 127; ++address) { |
| 46 | + // The i2c_scanner uses the return value of |
| 47 | + // the Write.endTransmisstion to see if |
| 48 | + // a device did acknowledge to the address. |
| 49 | + Wire.beginTransmission(address); |
| 50 | + byte error = Wire.endTransmission(); |
| 51 | + |
| 52 | + if (error == 0) { |
| 53 | + Serial.print("I2C device found at address 0x"); |
| 54 | + if (address < 16) { |
| 55 | + Serial.print("0"); |
| 56 | + } |
| 57 | + Serial.print(address, HEX); |
| 58 | + Serial.println(" !"); |
| 59 | + |
| 60 | + ++nDevices; |
| 61 | + } else if (error == 4) { |
| 62 | + Serial.print("Unknown error at address 0x"); |
| 63 | + if (address < 16) { |
| 64 | + Serial.print("0"); |
| 65 | + } |
| 66 | + Serial.println(address, HEX); |
| 67 | + } |
| 68 | + } |
| 69 | + if (nDevices == 0) { |
| 70 | + Serial.println("No I2C devices found\n"); |
| 71 | + } else { |
| 72 | + Serial.println("done\n"); |
| 73 | + } |
| 74 | + delay(5000); // Wait 5 seconds for next scan |
| 75 | +} |
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