initial commit

VOTE_Keyboard/code.py

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+import board
+from digitalio import DigitalInOut, Direction, Pull
+import adafruit_dotstar as dotstar
+from adafruit_hid.keyboard import Keyboard
+from adafruit_hid.keycode import Keycode
+from adafruit_hid.keyboard_layout_us import KeyboardLayoutUS
+
+dot = dotstar.DotStar(board.APA102_SCK, board.APA102_MOSI, 1, brightness=0.2)
+dot[0] = (0, 0, 0)
+
+kbd = Keyboard()
+kbdLayout = KeyboardLayoutUS(kbd)
+state = []
+pins = {}
+buttonMap = [
+    dict(row="D4", col="D0", id=1),
+    dict(row="D4", col="D1", id=2),
+    dict(row="D4", col="D2", id=3),
+    dict(row="D3", col="D2", id=4),
+    dict(row="D3", col="D0", id=5),
+    dict(row="D3", col="D1", id=6)]
+
+# Set up row pins
+for pin in ["D4", "D3"]:
+    p = DigitalInOut(getattr(board, pin))
+    p.direction = Direction.OUTPUT
+    pins[pin] = p
+
+# Set up column pins
+for pin in ["D0", "D1", "D2"]:
+    p = DigitalInOut(getattr(board, pin))
+    p.direction = Direction.INPUT
+    p.pull = Pull.DOWN
+    pins[pin] = p
+
+buttonIDtoKeycode = {
+    1: Keycode.V,
+    2: Keycode.O,
+    3: Keycode.T,
+    4: Keycode.E,
+    5: Keycode.SPACE,
+    6: Keycode.ENTER}
+
+while True:
+	# Compare old and new state
+    oldState = state
+    newState = []
+    newBtn = None
+    for button in buttonMap:
+        r = pins[button["row"]]
+        r.value = True
+        if pins[button["col"]].value:
+            newState += [button["id"]]
+            if not button["id"] in oldState:
+                newBtn = button["id"]
+        r.value = False
+    # Press & release keys
+    for oldID in oldState:
+        if not oldID in newState:
+            kbd.release(buttonIDtoKeycode[oldID])
+            dot[0] = (0, 0, 0)
+    if newBtn:
+        kbd.press(buttonIDtoKeycode[newBtn])
+        dot[0] = (255, 0, 0)
+    state = newState