led switch

led_switch2.py

+#!/usr/bin/python3
+
+import RPi.GPIO as GPIO
+import time, sys 
+
+# use pin numbers
+GPIO.setmode(GPIO.BOARD)
+
+# use pin 12 for output (=GPIO18)
+GPIO.setup(12, GPIO.OUT)
+ledOn = False
+GPIO.output(12, ledOn)
+
+# use pin 22 for input (=GPIO25)
+GPIO.setup(22, GPIO.IN)
+
+# callback function to switch LED output
+def switch_led(pin):
+    global ledOn
+    ledOn = not ledOn # switch
+    # write to pin 12
+    GPIO.output(12, ledOn)
+    return
+
+# detect the event of rising signal level at pin 22
+GPIO.add_event_detect(22, GPIO.RISING, bouncetime=200)
+# in case of an event switch LED output using
+#the callback function switch_led(pin)
+GPIO.add_event_callback(22, switch_led)
+
+try:
+    while True:
+        time.sleep(1)
+# interrupt using <Ctrl>+<c>
+except KeyboardInterrupt:
+    # release used pins and return
+    GPIO.cleanup()
+    sys.exit()