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| 1 | + // -------------------------------------- |
| 2 | +// i2c_scanner |
| 3 | +// https://playground.arduino.cc/Main/I2cScanner |
| 4 | +// |
| 5 | +// Version 1 |
| 6 | +// This program (or code that looks like it) |
| 7 | +// can be found in many places. |
| 8 | +// For example on the Arduino.cc forum. |
| 9 | +// The original author is not know. |
| 10 | +// Version 2, Juni 2012, Using Arduino 1.0.1 |
| 11 | +// Adapted to be as simple as possible by Arduino.cc user Krodal |
| 12 | +// Version 3, Feb 26 2013 |
| 13 | +// V3 by louarnold |
| 14 | +// Version 4, March 3, 2013, Using Arduino 1.0.3 |
| 15 | +// by Arduino.cc user Krodal. |
| 16 | +// Changes by louarnold removed. |
| 17 | +// Scanning addresses changed from 0...127 to 1...119, |
| 18 | +// according to the i2c scanner by Nick Gammon |
| 19 | +// http://www.gammon.com.au/forum/?id=10896 |
| 20 | +// Version 5, March 28, 2013 |
| 21 | +// As version 4, but address scans now to 127. |
| 22 | +// A sensor seems to use address 120. |
| 23 | +// Version 6, November 27, 2015. |
| 24 | +// Added waiting for the Leonardo serial communication. |
| 25 | +// Version 6c, November 30, 2018 |
| 26 | +// Modified to plain C for use with SDuino by Michael Mayer |
| 27 | +// |
| 28 | +// |
| 29 | +// This sketch tests the standard 7-bit addresses |
| 30 | +// Devices with higher bit address might not be seen properly. |
| 31 | +// |
| 32 | + |
| 33 | +#include <Wire.h> |
| 34 | + |
| 35 | + |
| 36 | +void setup() |
| 37 | +{ |
| 38 | + Wire_begin(); |
| 39 | + |
| 40 | + Serial_begin(9600); |
| 41 | + while (!Serial); // Leonardo: wait for serial monitor |
| 42 | + Serial_println_s("\nI2C Scanner"); |
| 43 | +} |
| 44 | + |
| 45 | + |
| 46 | +void loop() |
| 47 | +{ |
| 48 | + byte error, address; |
| 49 | + int nDevices; |
| 50 | + |
| 51 | + Serial_println_s("Scanning..."); |
| 52 | + |
| 53 | + nDevices = 0; |
| 54 | + for(address = 1; address < 127; address++ ) |
| 55 | + { |
| 56 | + // The i2c_scanner uses the return value of |
| 57 | + // the Write_endTransmisstion to see if |
| 58 | + // a device did acknowledge to the address. |
| 59 | + Wire_beginTransmission(address); |
| 60 | + error = Wire_endTransmission(); |
| 61 | + |
| 62 | + if (error == 0) |
| 63 | + { |
| 64 | + Serial_print_s("I2C device found at address 0x"); |
| 65 | + if (address<16) |
| 66 | + Serial_print_s("0"); |
| 67 | + Serial_print_ub(address,HEX); |
| 68 | + Serial_println_s(" !"); |
| 69 | + |
| 70 | + nDevices++; |
| 71 | + } |
| 72 | + else if (error==4) |
| 73 | + { |
| 74 | + Serial_print_s("Unknown error at address 0x"); |
| 75 | + if (address<16) |
| 76 | + Serial_print_s("0"); |
| 77 | + Serial_println_ub(address,HEX); |
| 78 | + } |
| 79 | + } |
| 80 | + if (nDevices == 0) |
| 81 | + Serial_println_s("No I2C devices found\n"); |
| 82 | + else |
| 83 | + Serial_println_s("done\n"); |
| 84 | + |
| 85 | + delay(5000); // wait 5 seconds for next scan |
| 86 | +} |
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