diff --git a/gpiozero/__init__.py b/gpiozero/__init__.py
new file mode 100644
index 0000000..d1aa32c
--- /dev/null
+++ b/gpiozero/__init__.py
@@ -0,0 +1,20 @@
+from __future__ import absolute_import
+from RPi import GPIO
+
+GPIO.setmode(GPIO.BCM)
+GPIO.setwarnings(False)
+
+from .input_devices import (
+    InputDeviceError,
+    InputDevice,
+    Button,
+    MotionSensor,
+    LightSensor,
+    TemperatureSensor,
+)
+from .output_devices import (
+    OutputDevice,
+    LED,
+    Buzzer,
+    Motor,
+)
diff --git a/gpiozero/input_devices.py b/gpiozero/input_devices.py
new file mode 100644
index 0000000..68f8738
--- /dev/null
+++ b/gpiozero/input_devices.py
@@ -0,0 +1,94 @@
+from RPi import GPIO
+from w1thermsensor import W1ThermSensor
+
+
+class InputDevice(object):
+    def __init__(self, pin=None):
+        if pin is None:
+            raise InputDeviceError('No GPIO pin number given')
+
+        self.pin = pin
+        self._pull = GPIO.PUD_UP
+        self._edge = GPIO.FALLING
+        self._active_state = 0
+        self._inactive_state = 1
+        GPIO.setup(pin, GPIO.IN, self._pull)
+
+    @property
+    def is_active(self):
+        return GPIO.input(self.pin) == self._active_state
+
+    def wait_for_input(self):
+        GPIO.wait_for_edge(self.pin, self._edge)
+
+    def add_callback(self, callback=None, bouncetime=1000):
+        if callback is None:
+            raise InputDeviceError('No callback function given')
+
+        GPIO.add_event_detect(self.pin, self._edge, callback, bouncetime)
+
+    def remove_callback(self):
+        GPIO.remove_event_detect(self.pin)
+
+
+class Button(InputDevice):
+    pass
+
+
+class MotionSensor(InputDevice):
+    def _is_active_with_pause(self):
+        sleep(0.1)
+        return self.is_active
+
+    @property
+    def motion_detected(self):
+        n = 20
+        return sum(self._is_active_with_pause() for i in range(n)) > n/2
+
+
+class LightSensor(object):
+    def __init__(self, pin=None, darkness_level=0.01):
+        if pin is None:
+            raise InputDeviceError('No GPIO pin number given')
+
+        self.pin = pin
+        self.darkness_level = darkness_level
+
+    @property
+    def value(self):
+        return self._get_average_light_level(5)
+
+    def _get_light_level(self):
+        time_taken = self._time_charging_light_capacitor()
+        value = 100 * time_taken / self.darkness_level
+        return 100 - value
+
+    def _time_charging_light_capacitor(self):
+        GPIO.setup(self.pin, GPIO.OUT)
+        GPIO.output(self.pin, GPIO.LOW)
+        sleep(0.1)
+        GPIO.setup(self.pin, GPIO.IN)
+        start_time = time()
+        end_time = time()
+        while (
+            GPIO.input(self.pin) == GPIO.LOW and
+            time() - start_time < self.darkness_level
+        ):
+            end_time = time()
+        time_taken = end_time - start_time
+        return min(time_taken, self.darkness_level)
+
+    def _get_average_light_level(self, num):
+        values = [self._get_light_level() for n in range(num)]
+        average_value = sum(values) / len(values)
+        return average_value
+
+
+class TemperatureSensor(W1ThermSensor):
+    @property
+    def value(self):
+        return self.get_temperature()
+
+
+class InputDeviceError(Exception):
+    pass
diff --git a/gpiozero/output_devices.py b/gpiozero/output_devices.py
new file mode 100644
index 0000000..6129423
--- /dev/null
+++ b/gpiozero/output_devices.py
@@ -0,0 +1,25 @@
+from RPi import GPIO
+
+
+class OutputDevice(object):
+    def __init__(self, pin):
+        self.pin = pin
+        GPIO.setup(pin, GPIO.OUT)
+
+    def on(self):
+        GPIO.output(self.pin, True)
+
+    def off(self):
+        GPIO.output(self.pin, False)
+
+
+class LED(OutputDevice):
+    pass
+
+
+class Buzzer(OutputDevice):
+    pass
+
+
+class Motor(OutputDevice):
+    pass