75 lines
1.8 KiB
C++
75 lines
1.8 KiB
C++
// --------------------------------------
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// i2c_scanner
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//
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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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//
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// This sketch tests the standard 7-bit addresses
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// from 0 to 127. Devices with higher bit address
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// might not be seen properly.
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//
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// Adapted to be as simple as possible by Arduino.cc user Krodal
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//
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// June 2012
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// Using Arduino 1.0.1
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//
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// Source: https://forum.arduino.cc/t/atmel-24c256-showing-up-at-wrong-i2c-address/123760/4
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// Better code but not working for me:
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// https://create.arduino.cc/projecthub/sainisagar7294/how-to-find-i2c-address-using-arduino-a24f72
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// https://stackoverflow.com/questions/57978198/can-an-i2c-eeprom-have-two-addresses
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#include <Wire.h>
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void setup()
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{
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Wire.begin();
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Serial.begin(9600);
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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 = 0; address <= 254; 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("Unknow 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(8000); // wait 8 seconds for next scan
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}
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