Device identification and simple command listening (not tested yet)

OneWireIO.ino

@@ -1,7 +1,62 @@
-void setup() {
+#include "OWSlave.h"
 
+#define LEDPin    13
+#define OWPin     2
+#define InterruptNumber 0 // Must correspond to the OWPin to correctly detect state changes. On Arduino Uno, interrupt 0 is for digital pin 2
+
+unsigned char rom[8] = {0xE2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00};
+
+volatile long prevInt    = 0;      // Previous Interrupt micros
+volatile boolean owReset = false;
+
+OWSlave oneWire(OWPin); 
+
+void setup()
+{
+    pinMode(LEDPin, OUTPUT); 
+    pinMode(OWPin, INPUT);
+
+    digitalWrite(LEDPin, LOW);
+
+    attachInterrupt(InterruptNumber,onewireInterrupt,CHANGE);
+    
+    oneWire.setRom(rom);
 }
 
-void loop() {
+void loop()
+{
+    if (owReset) owHandler();
+}
 
-}
+void owHandler(void)
+{
+    detachInterrupt(InterruptNumber);
+    owReset=false;
+    
+    if (oneWire.presence()) {
+        if (oneWire.recvAndProcessCmd()) {
+            uint8_t cmd = oneWire.recv();
+            if (cmd == 0x44) {
+                digitalWrite(LEDPin, HIGH);
+            }
+            if (cmd == 0xBE) {
+                for( int i = 0; i < 9; i++) {
+                    oneWire.send((byte)0);
+                }
+            }
+        }
+    }
+    attachInterrupt(InterruptNumber,onewireInterrupt,CHANGE);
+}
+
+void onewireInterrupt(void)
+{
+    volatile long lastMicros = micros() - prevInt;
+    prevInt = micros();
+    if (lastMicros >= 410 && lastMicros <= 550)
+    {
+        //  OneWire Reset Detected
+        owReset=true;
+    }
+}
+