Add basic version of code

examples/my_hat.py

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+from gpio_components import LED, Buzzer, Button
+from time import sleep
+
+
+class MyHat(object):
+    def __init__(self):
+        self.red = LED(9)
+        self.yellow = LED(10)
+        self.green = LED(11)
+        self.buzzer = Buzzer(14)
+        self.button = Button(15)
+
+        self.leds = [self.red, self.yellow, self.green]
+        self.outputs = self.leds + [self.buzzer]
+
+    def all_on(self):
+        for device in self.outputs:
+            device.on()
+
+    def all_off(self):
+        for device in self.outputs:
+            device.off()
+
+
+if __name__ == '__main__':
+    hat = MyHat()
+
+    while True:
+        if hat.button.is_pressed():
+            hat.all_on()
+        else:
+            hat.all_off()

gpio_components/input_devices.py

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+from RPi import GPIO
+
+
+GPIO.setmode(GPIO.BCM)
+GPIO.setwarnings(False)
+
+
+class InputDevice(object):
+    def __init__(self, pin):
+        self.pin = pin
+        GPIO.setup(pin, GPIO.IN, GPIO.PUD_UP)
+
+    def is_pressed(self):
+        return GPIO.input(self.pin) == 0
+
+
+class Button(InputDevice):
+    pass

gpio_components/output_devices.py

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+from RPi import GPIO
+
+
+GPIO.setmode(GPIO.BCM)
+GPIO.setwarnings(False)
+
+
+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