jasonblewis · September 15, 2018 23:08 · Sep 15, 2018
diff --git a/switchdebounce.py b/switchdebounce.py
@@ -0,0 +1,68 @@
+import machine
+from machine import Timer
+# see listing one
+# https://www.embedded.com/electronics-blogs/break-points/4024981/My-favorite-software-debouncers
+
+np = machine.Neopixel(15,8,machine.Neopixel.TYPE_RGB)
+
+button = machine.Pin(34,machine.Pin.IN)
+
+check_msec = 20
+press_msec = 10
+release_msec = 100
+count = release_msec / check_msec
+
+RawKeyPressed = False
+DebouncedKeyPress = False
+
+key_changed = False
+key_changed = False
+
+def key_pressed_cb(kc, kp):
+    print("key changed: ", kc)
+    print" key pressed: ", kp
+
+
+def tcb(timer):
+    global check_msec
+    global RawKeyPressed
+    global DebouncedKeyPress
+    global count
+    global key_pressed
+    global key_changed
+    global button
+
+    key_changed = False;
+    key_pressed = DebouncedKeyPress
+    RawState = button.value()
+    if (RawState):
+        #set the timer which will allow a c hange from the current state.
+        if (DebouncedKeyPress):
+            count = release_msec / check_msec
+        else:
+            count = press_msec / check_msec
+    else:
+        # key has changed - wait for new state to become stable
+        count -= 1
+        if (count == 0):
+            # timer expired - accept the change.
+            DebouncedKeyPress = RawState
+            key_changed = True
+            key_pressed = DebouncedKeyPress
+            key_pressed_cb(key_changed,key_pressed)
+            # and reset the timer
+            if (DebouncedKeyPress):
+                count = release_msec / check_msec
+            else:
+                count = press_msec / check_msec
+
+
+
+
+
+
+t1 = machine.Timer(2)
+t1.init(period=check_msec, mode=t1.PERIODIC,callback=tcb)
+
+while True:
+    print("key pressed: ", key_pressed)