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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()
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