diff --git a/movement_sensor/movement_sensor.ino b/movement_sensor/movement_sensor.ino
new file mode 100644
index 0000000..6870840
--- /dev/null
+++ b/movement_sensor/movement_sensor.ino
@@ -0,0 +1,32 @@
+#include <Tiny.h>
+#include <SoftwareSerial_Tiny.h>
+#include <TinyPower.h>
+
+// Pins
+#define MOVEMENT_PIN PCINT2
+#define SENDER 4
+
+ContactSensor sensor = ContactSensor(MOVEMENT_SENSOR, SENDER);
+
+volatile bool shouldSend = false;
+
+void setup() {
+
+	pinMode(MOVEMENT_PIN, INPUT_PULLUP);
+	sensor.setup();
+	TinyPower::setup();
+	PCMSK |= (1 << MOVEMENT_PIN);
+}
+
+void loop() {
+	if (shouldSend) {
+		shouldSend = false;
+		int currentState = digitalRead(MOVEMENT_PIN);
+		sensor.sendState(!currentState);
+	}
+	TinyPower::sleep();
+}
+
+ISR(PCINT0_vect) {
+	shouldSend = true;
+}