Improve debouncing (ensure falling edge)

speller.py

@@ -78,14 +78,14 @@ def send(symbol: dict):
         with open('/dev/hidg0', 'wb+') as fd:
             for i in range(0, len(symbol['scancodes']), 2):
                 scancodes = symbol['scancodes'][i] + chr(
-                    0) + symbol['scancodes'][i + 1] + 5 * chr(0)
+                    0) + symbol['scancodes'][i + 1] + 13 * chr(0)
                 fd.write(scancodes.encode())
     else:
         print(symbol['output'])
         with open('output.bin', 'ab+') as fd:
             for i in range(0, len(symbol['scancodes']), 2):
                 scancodes = symbol['scancodes'][i] + chr(
-                    0) + symbol['scancodes'][i + 1] + 5 * chr(0)
+                    0) + symbol['scancodes'][i + 1] + 13 * chr(0)
                 fd.write(scancodes.encode())
 
 
@@ -226,6 +226,7 @@ class Speller(wx.Frame):
 
 
 def falling(channel):
+    if not GPIO.input(pin):
         pub.sendMessage("listener", message="falling")
 
 
@@ -236,7 +237,7 @@ def main():
         GPIO.add_event_detect(pin,
                               GPIO.FALLING,
                               callback=falling,
-                              bouncetime=100)
+                              bouncetime=200)
     app = wx.App()
     sp = Speller(None)
     sp.Show()