66 lines
1.4 KiB
Python
66 lines
1.4 KiB
Python
#!/usr/bin/python
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import sys
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from datetime import datetime
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import time
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import RPi.GPIO as IO
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MOTOR_PIN = 19
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def timestamped(s):
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"""
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Prepends a timestamp to a string.
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"""
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return "[{:%Y-%m-%d %H:%M:%S}] {}".format(datetime.now(), s)
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def setup_pwm():
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"""
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Performs initialization for pulse width modulation.
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Returns the PWM object for the motor pin.
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"""
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IO.setwarnings(False)
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IO.setmode(IO.BCM)
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IO.setup(MOTOR_PIN, IO.OUT)
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p = IO.PWM(MOTOR_PIN, 100) # Second argument is frequency, I think
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return p
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def unlock_door(p):
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"""
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Uses PWM to turn the motor connected to the door handle.
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"""
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p.start(50)
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time.sleep(1.0)
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p.stop()
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def read_loop():
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"""
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Simple REPL skeleton for validating scanned IDs.
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"""
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# Open the log file in append mode
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log_file = open("./access.log", "a")
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log_file.write(timestamped("=== Door security initiated ===\n"))
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# Initialize the PWM pin
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pwm_pin = setup_pwm()
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# Begin the loop
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while True:
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# TODO: Read in the ID
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# TODO: Check if the ID is authorized
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authorized = False
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# If the user is not authorized, deny access
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if input not in authorized:
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s = timestamped("##### denied\n")
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log_file.write(s)
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# If the user is authorized, perform the unlock procedure
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else:
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s = timestamped("##### <Username> validated")
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log_file.write(s)
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# TODO: Play open tone
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# TODO: Run unlock procedure
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unlock_door(pwm_pin)
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if __name__ == "__main__":
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read_loop()
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