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I2C_DETECT/I2C_DETECT.ino

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+// --------------------------------------
+// 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
+//
+
+#include <Wire.h>
+
+
+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 <= 127; 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(500);           // wait 8 seconds for next scan
+}