Add LED cheese example

examples/led_cheese.py

+# Copyright 2021 Benedict Suska <benedict.suska@teckids.org>
+# Copyright 2021 Dominik George <dominik.george@teckids.org>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import re
+import time
+from machine import Pin, deepsleep
+from credentials import *
+from wifi import Wifi
+from mytrix import Matrix
+
+def set_colour(matches, event):
+    colour = matches[0]
+    sender = event["sender"]
+
+    if is_allowed(sender):
+        matrix.send_room_message(ROOM_ID, "Ich habe noch keine LEDS :(...")
+
+def is_allowed(sender):
+    with open("users.txt", "rt") as f:
+        users = f.readlines()
+
+    if not "%s\n" % (sender,) in users:
+        return True
+    else:
+        matrix.send_room_message(ROOM_ID, "Du hast mir gar nichts zu sagen, %s!" % (sender,))
+        return False
+
+def allow_user(matches, event):
+    """Add a user to the allow list."""
+    user = matches[0]
+    sender = event["sender"]
+
+    if is_allowed(sender):
+        with open("users.txt", "at") as f:
+            f.write(user + "\n")
+        matrix.send_room_message(ROOM_ID, "%s darf mich jetzt leuchten lassen!" % (user,))
+
+# Define LED colour pins
+pin_red = Pin(13, Pin.OUT)
+pin_green = Pin(12, Pin.OUT)
+pin_blue = Pin(14, Pin.OUT)
+
+# Switch off all LEDs
+pin_red.off()
+pin_green.off()
+pin_blue.off()
+
+# Connect to wifi
+network = Wifi(SSID, PSK)
+network.connect()
+
+# Connect to Matrix server
+matrix = Matrix(HOMESERVER, MATRIX_ID, ACCESS_TOKEN)
+
+# On which texts to react and which LEDs to turn on
+colour_re = re.compile("leuchte (.*)", re.I)
+permission_re = re.compile("hoer auf (.*)", re.I)
+cases = {colour_re: set_colour, permission_re: allow_user)
+
+if network.is_connected():
+    # Send message that I am there
+    matrix.send_room_message(ROOM_ID, "Hey! Alles cheesy, ich bin bereit zum Leuchten!")
+    matrix.send_room_message(ROOM_ID, "Lass mir etwas Zeit, auf deine Nachrichten zu reagieren!")
+
+    # Wait for a message
+    while True:
+        matrix.react_room_messages(ROOM_ID, cases)
+        time.sleep(10)