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@@ -0,0 +1,119 @@
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+import time
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+import datetime
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+import smtplib
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+import math
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+from email.mime.text import MIMEText
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+from datetime import datetime
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+
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+from microstacknode.hardware.accelerometer.mma8452q import MMA8452Q
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+
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+
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+EMAIL_USERNAME = 'noreply@ianonavy.com'
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+EMAIL_PASSWORD = 'S2PENjQbO6=cHgchw@CXs.bJ'
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+RECIPIENT_EMAILS = [
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+ 'ianonavy@gmail.com', 'dmurvihill@gmail.com',
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+ '5038304363@tmomail.net'
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+]
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+ALERT_EMAIL_TEXT = """Hi,
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+
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+Your laundry is done. Or maybe your roomate's. I don't know.
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+
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+Regretfully,
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+Ianonavy Bot
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+"""
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+G_RANGE = 2
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+INTERVAL = 0.005 # seconds
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+WINDOW_SIZE = 40 # intervals
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+THRESHOLD = 0.003 # G's
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+MAX_EMAIL_FREQUENCY = 60 # seconds
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+
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+
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+def average(s):
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+ return sum(s) * 1.0 / len(s)
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+
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+
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+def stdev(s):
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+ if not s:
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+ return 0
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+ avg = average(list(s))
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+ variance = map(lambda x: (x - avg) ** 2, s)
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+ return math.sqrt(average(list(variance)))
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+
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+
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+def notify_user(recipient_email_address):
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+ print("Alerting " + recipient_email_address)
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+
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+ msg = MIMEText(ALERT_EMAIL_TEXT)
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+
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+ # me == the sender's email address
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+ # you == the recipient's email address
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+ msg['Subject'] = 'Laundry Finished'
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+ msg['From'] = 'pi@localhost'
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+ msg['To'] = recipient_email_address
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+
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+ # Send the message via our own SMTP server.
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+ username = EMAIL_USERNAME
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+ password = EMAIL_PASSWORD
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+ server = smtplib.SMTP('smtp.gmail.com:587')
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+ server.starttls()
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+ server.login(username, password)
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+ server.send_message(msg)
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+ server.quit()
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+
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+
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+def enqueue(sliding_window, item):
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+ if len(sliding_window) == WINDOW_SIZE:
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+ sliding_window.pop(0)
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+ sliding_window.append(item)
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+
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+
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+def amplitude_stdev(sliding_window):
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+ standard_deviations = {}
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+ for key in ('x', 'y', 'z'):
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+ values = [instance[key] for instance in sliding_window]
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+ standard_deviations[key] = stdev(values)
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+ return standard_deviations
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+
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+
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+def send_emails(last_email_sent_at):
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+ print((datetime.now() - last_email_sent_at).seconds) # for debugging
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+ # limit frequency of emails
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+ if (datetime.now() - last_email_sent_at).seconds > MAX_EMAIL_FREQUENCY:
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+ [notify_user(email) for email in RECIPIENT_EMAILS]
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+ return datetime.now()
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+ return last_email_sent_at
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+
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+
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+def main():
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+ with MMA8452Q() as accelerometer:
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+ # Configure accelerometer
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+ accelerometer.standby()
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+ accelerometer.set_g_range(G_RANGE)
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+ accelerometer.activate()
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+
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+ # Settle
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+ time.sleep(INTERVAL)
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+
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+ sliding_window = []
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+ dryer_state = 'off'
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+ last_email_sent_at = datetime(1970, 1, 1, 0, 0, 0)
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+
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+ while True:
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+ g_values = accelerometer.get_xyz()
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+ enqueue(sliding_window, g_values)
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+ sliding_stdev = amplitude_stdev(sliding_window)
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+ print(sliding_stdev, dryer_state) # for debugging
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+ # don't send emails right at the beginning
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+ if g_values:
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+ if sliding_stdev['x'] < THRESHOLD:
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+ if dryer_state == 'on':
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+ last_email_sent_at = send_emails(last_email_sent_at)
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+ dryer_state = 'off'
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+ else:
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+ dryer_state = 'on'
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+
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+ time.sleep(INTERVAL)
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+
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+
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+if __name__ == '__main__':
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+ main()
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