diff --git a/I2CScanner/I2CScanner.ino b/I2CScanner/I2CScanner.ino new file mode 100644 index 0000000..41ce62b --- /dev/null +++ b/I2CScanner/I2CScanner.ino @@ -0,0 +1,72 @@ +// -------------------------------------- + // i2c_scanner + // + // 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. + // + // This sketch tests the standard 7-bit addresses + // from 0 to 127. Devices with higher bit address + // might not be seen properly. + // + // Adapted to be as simple as possible by Arduino.cc user Krodal + // + // June 2012 + // Using Arduino 1.0.1 + // + // Source: https://forum.arduino.cc/t/atmel-24c256-showing-up-at-wrong-i2c-address/123760/4 + +#include + + +void setup() + { + Wire.begin(); + + Serial.begin(9600); + Serial.println("\nI2C Scanner"); + } + + +void loop() + { + byte error, address; + int nDevices; + + Serial.println("Scanning..."); + + nDevices = 0; + for(address = 0; address <= 254; 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("Unknow 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(8000); // wait 8 seconds for next scan + }