First Commit

i2c_test/i2c_test.ino

@@ -0,0 +1,38 @@
+#include <Wire.h>
+
+void setup()
+{
+  Serial.begin (57600);  
+  Wire.begin ();   // sda= GPIO_21 /scl= GPIO_22
+}
+
+void Scanner ()
+{
+  Serial.println ();
+  Serial.println ("I2C scanner. Scanning ...");
+  byte count = 0;
+
+  Wire.begin();
+  for (byte i = 8; i < 120; i++)
+  {
+    Wire.beginTransmission (i);          // Begin I2C transmission Address (i)
+    if (Wire.endTransmission () == 0)  // Receive 0 = success (ACK response) 
+    {
+      Serial.print ("Found address: ");
+      Serial.print (i, DEC);
+      Serial.print (" (0x");
+      Serial.print (i, HEX);     // PCF8574 7 bit address
+      Serial.println (")");
+      count++;
+    }
+  }
+  Serial.print ("Found ");      
+  Serial.print (count, DEC);        // numbers of devices
+  Serial.println (" device(s).");
+}
+
+void loop()
+{
+  Scanner ();
+  delay (10000);
+}