Add 'traffic_lights.py'

traffic_lights.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+
+from gpiozero import TrafficLights, Button, PWMOutputDevice
+from time import sleep
+
+
+def main():
+    lights = TrafficLights(14, 15, 18)
+    lights.off()
+    lights.green.on()
+    pedestrian_button = Button(23)
+    buzzer = PWMOutputDevice(12)
+    buzzer.frequency = 444
+    buzzer.value = 0.5
+    buzzer.off()
+    while True:
+        pedestrian_button.wait_for_press()
+        pedestrian_call(lights, buzzer)
+
+
+def pedestrian_call(lights, buzzer):
+    buzz(buzzer, 1)
+    sleep(3)
+    lights.green.off()
+    lights.amber.on()
+    sleep(4)
+    lights.amber.off()
+    lights.red.on()
+    buzz(buzzer, 2)
+    sleep(5)
+    buzz(buzzer, 3)
+    sleep(3)
+    lights.red.off()
+    lights.green.on()
+
+
+def buzz(buzzer, n=1):
+    for i in range(n):
+        buzzer.value = 0.5
+        sleep(0.1)
+        buzzer.off()
+        sleep(0.1)
+
+if __name__ == "__main__":
+    main()