refined button handler

Moped/moped.py

@@ -10,11 +10,19 @@ greenLed = 18
 
 buttonPin = 27
 
-sleepTime = 0.25
+sleepTimes = [1, 0.5, 0.25, 0.125]
+sleepTimeIndex = 0
 
 def buttonHandler(channel):
+    global sleepTimeIndex
     print 'button pushed'
+    sleepTimeIndex = (sleepTimeIndex + 1) % len(sleepTimes)
 
+def setLeds(yellow, red, green):
+    GPIO.output(yellowLed, yellow)
+    GPIO.output(redLed, red)
+    GPIO.output(greenLed, green)
+    
 try:
     GPIO.setmode(GPIO.BCM)
     GPIO.setup(yellowLed, GPIO.OUT)
@@ -26,21 +34,12 @@ try:
     GPIO.add_event_detect(buttonPin, GPIO.FALLING, callback=buttonHandler, bouncetime=1000)    
 
     while True:
-        GPIO.output(yellowLed, 1)
-        GPIO.output(redLed, 0)
-        GPIO.output(greenLed, 0)
-        sleep(sleepTime)
-        GPIO.output(yellowLed, 0)
-        GPIO.output(redLed, 1)
-        GPIO.output(greenLed, 0)
-        sleep(sleepTime)
-        GPIO.output(yellowLed, 0)
-        GPIO.output(redLed, 0)
-        GPIO.output(greenLed, 1)
-        sleep(sleepTime)
-except KeyboardInterrupt:
-    GPIO.output(yellowLed, 0)
-    GPIO.output(redLed, 0)
-    GPIO.output(greenLed, 0)
+        setLeds(1, 0, 0)
+        sleep(sleepTimes[sleepTimeIndex])
+        setLeds(0, 1, 0)
+        sleep(sleepTimes[sleepTimeIndex])
+        setLeds(0, 0, 1)
+        sleep(sleepTimes[sleepTimeIndex])
 finally:
+    setLeds(0, 0, 0)
     GPIO.cleanup()