Refresh of ALL Demos in prep for 2.20 release

Demo_Pi_LEDs.py

@@ -0,0 +1,59 @@
+import PySimpleGUI as g
+
+# GUI for switching an LED on and off to GPIO14
+
+# GPIO and time library:
+import RPi.GPIO as GPIO
+import time
+
+# determine that GPIO numbers are used:
+GPIO.setmode(GPIO.BCM)
+GPIO.setup(14, GPIO.OUT)
+
+def SwitchLED():
+    varLEDStatus = GPIO.input(14)
+
+    if varLEDStatus == 0:
+        GPIO.output(14, GPIO.HIGH)
+        return "LED is switched ON"
+    else:
+        GPIO.output(14, GPIO.LOW)
+        return "LED is switched OFF"
+
+
+def FlashLED():
+    for i in range(5):
+        GPIO.output(14, GPIO.HIGH)
+        time.sleep(0.5)
+        GPIO.output(14, GPIO.LOW)
+        time.sleep(0.5)
+
+results_elem = g.T('', size=(30,1))
+
+layout = [[g.T('Raspberry Pi LEDs')],
+           [results_elem],
+           [g.ReadFormButton('Switch LED')],
+           [g.ReadFormButton('Flash LED')],
+           [g.ReadFormButton('Show slider value')],
+           [g.Slider(range=(0, 100), default_value=0, orientation='h', size=(40,20), key='slider')],
+           [g.Exit()]
+          ]
+
+form = g.FlexForm('Raspberry Pi GUI')
+form.Layout(layout)
+
+while True:
+    button, values = form.Read()
+    if button is None:
+        break
+    if button is 'Switch LED':
+        results_elem.Update(SwitchLED())
+    elif button is 'Flash LED':
+        results_elem.Update('LED is Flashing')
+        form.ReadNonBlocking()
+        FlashLED()
+        results_elem.Update('')
+    elif button is 'Show slider value':
+        results_elem.Update('Slider = %s'%values['slider'])
+
+g.MsgBox('Done... exiting')