Merge pull request #121 from bennuttall/patch-3

Use GPIO Zero for Traffic HAT

src/en/overlay/traffic-hat.md

@@ -50,19 +50,26 @@ pin:
 ###A quick and easy way to learn the basics of GPIO on a budget. All in a nice HAT.
 
 ```python
-import RPi.GPIO as IO
+from gpiozero import TrafficHat
 from time import sleep
+from signal import pause
 
-IO.setmode(IO.BCM)
+hat = TrafficHat()
 
-#Lights
-IO.setup(22,IO.OUT)
-IO.setup(23,IO.OUT)
-IO.setup(24,IO.OUT)
+# control components individually
+hat.lights.green.on()
+sleep(1)
+hat.lights.amber.on()
+sleep(1)
+hat.lights.red.on()
+sleep(1)
+hat.buzzer.on()
+sleep(1)
+hat.off()  # turn everything off
 
-#Buzzer
-IO.setup(5,IO.OUT)
+# set up events on button press/release
+hat.button.when_pressed = hat.lights.blink
+hat.button.when_released = hat.lights.off
 
-#Button
-IO.setup(25,IO.IN,pull_up_down=IO.PUD_UP)
+pause()
 ```