diff --git a/README.md b/README.md
index 078fe34..a9daedb 100644
--- a/README.md
+++ b/README.md
@@ -7,3 +7,4 @@ Abstraction classes for everyday GPIO components, based on RPi.GPIO
 - LED
 - Buzzer
 - Button
+- MotionSensor
diff --git a/gpio_components/input_devices.py b/gpio_components/input_devices.py
index 3155a4a..40a31b2 100644
--- a/gpio_components/input_devices.py
+++ b/gpio_components/input_devices.py
@@ -37,5 +37,15 @@ class Button(InputDevice):
     pass
 
 
+class MotionSensor(InputDevice):
+    def _is_active_with_pause(self):
+        sleep(0.1)
+        return self.is_active()
+
+    def motion_detected(self):
+        n = 20
+        return sum(self._is_active_with_pause() for i in range(n)) > n/2
+
+
 class InputDeviceError(Exception):
     pass