diff --git a/README.md b/README.md
index 8c4ac1b..75f2300 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,29 @@
-# PIR Sensor
+# PIR Sensor (Interface to ESP8266)
 
 * Schematic
   + ![](./Pirschematic.png)
 * [Datasheet](./BISS0001-SilvanChip.pdf)
-* [ESP8266](./esp8266.md)
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+* [ESP8266](./esp8266.md)
+  + GPIO12 : PIR Out
+  + VCC    : 3.3 / 5V
+  + GND    : GND
+
+* Sample Arduino Code
+  ```arduino
+  int inPin = 12;
+
+  void setup() {
+    // put your setup code here, to run once:
+    Serial.begin(9600);
+
+    pinMode(inPin, INPUT);
+  }
+
+  void loop() {
+    // put your main code here, to run repeatedly:
+    int val = digitalRead(inPin);
+    Serial.print("*Detected = "); Serial.println(val);
+
+    Sleep(500);
+  }
+  ```
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