1 files changed, 56 insertions, 0 deletions
diff --git a/echtgeld.py b/echtgeld.py
new file mode 100644
index 0000000..8e23124
--- /dev/null
+++ b/echtgeld.py
@@ -0,0 +1,56 @@
+import threading
+import RPi.GPIO as g
+
+INHIBIT_PIN=40
+MONEY_PIN=38
+AMOUNT_PER_PULSE=5
+TIMEOUT = 30
+
+g.setmode(g.BOARD)
+
+g.setup(INHIBIT_PIN, g.OUT)
+g.output(INHIBIT_PIN, True)
+
+g.setup(MONEY_PIN, g.IN, pull_up_down = g.PUD_UP)
+
+
+class MoneyTransaction:
+	def __init__(self, end_callback, add_money_callback) -> None:
+		self.end_callback = end_callback
+		self.add_money_callback = add_money_callback
+		self.lock = threading.Lock()
+		self.lock.acquire_lock(blocking=True)
+		self.timer = None
+		self.timer_lock = threading.Lock()
+	
+	def __end_callback(self, _ = None):
+		print("End Callback")
+		self.end_callback()
+		g.output(INHIBIT_PIN, True) # Disable Bill Acceptor
+		try:
+			g.remove_event_detect(MONEY_PIN)
+		except Exception:
+			pass
+		with self.timer_lock:
+			if self.timer is not None:
+				self.timer.cancel()
+			self.timer = None
+		self.lock.release_lock()
+		
+	def __add_money_callback(self, _ = None):
+		with self.timer_lock:
+			if self.timer is not None:
+				self.timer.cancel()
+			self.timer = threading.Timer(TIMEOUT, self.__end_callback) # create Timeout
+			self.timer.start()
+		self.add_money_callback(AMOUNT_PER_PULSE)
+	
+	def start(self):
+		print("Start Transaction")
+		g.output(INHIBIT_PIN, False) # Enable Bill Acceptor
+		with self.timer_lock:
+			self.timer = threading.Timer(TIMEOUT, self.__end_callback) # create Timeout
+			self.timer.start()
+		g.add_event_detect(MONEY_PIN, g.FALLING, callback = self.__add_money_callback, bouncetime=130)
+	def stop(self):
+		self.__end_callback()