| #include <Arduino.h> |
| // -------------------------------------- |
| // 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 known. |
| // 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 |
| // https://www.gammon.com.au/forum/?id=10896 |
| // 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(); |
| void loop(); |
| void setup() { |
| Wire.begin(); |
| |
| Serial.begin(1152000); |
| while (!Serial); // Leonardo: wait for Serial Monitor |
| Serial.println("\nI2C Scanner"); |
| } |
| |
| void loop() { |
| int nDevices = 0; |
| |
| Serial.println("Scanning..."); |
| |
| for (byte address = 1; address < 32; ++address) { |
| // The i2c_scanner uses the return value of |
| // the Wire.endTransmission to see if |
| // a device did acknowledge to the address. |
| Wire.beginTransmission(address); |
| byte 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); |
| } else { |
| Serial.print("No I2C device found 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 |
| } |
| |