Raspberry Pi Fridge Minder: receive an email when the door is opened
I decided to see what other kinds of Fridge Minder project can be made from the MonkMakes Raspberry Pi Electronics Starter Kit, that I designed.
The kit comes with project cards and a link to download the accompanying Python scripts. And Fridge Minder projects already include a light meter and email notifier, so I decided to combine these two projects into one and make something that will send an email whenever the fridge door is opened.
BTW. A big thank you to Fritzing for a great design tool.
The photoresistor needs to be inside the fridge, so we can use two of the male to female jumper leads. This will of course also provide us with proof to the eternal question of whether the light really goes off when you close the fridge door.
You can see the completed breadboard and Pi below.
# fridge.py
import RPi.GPIO as GPIO
import time, math
import smtplib, time
SMTP_SERVER = 'smtp.gmail.com'
SMTP_PORT = 587
GPIO.setmode(GPIO.BCM)
a_pin = 18
b_pin = 23
led_pin = 24
GPIO.setup(led_pin, GPIO.OUT)
GPIO.output(led_pin, False)
def discharge():
GPIO.setup(a_pin, GPIO.IN)
GPIO.setup(b_pin, GPIO.OUT)
GPIO.output(b_pin, False)
time.sleep(0.01)
def charge_time():
GPIO.setup(b_pin, GPIO.IN)
GPIO.setup(a_pin, GPIO.OUT)
GPIO.output(a_pin, True)
t1 = time.time()
t2 = t1
while GPIO.input(b_pin) == 0:
t2 = time.time()
if (t2 - t1) > 1.0:
return 0
return (t2 - t1) * 1000000
def analog_read():
discharge()
return charge_time()
def send_email(username, password, recipient, subject, text):
print(username, password, recipient, subject, text)
smtpserver = smtplib.SMTP(SMTP_SERVER, SMTP_PORT)
smtpserver.ehlo()
smtpserver.starttls()
smtpserver.ehlo
smtpserver.login(username, password)
header = 'To:' + recipient + '\n' + 'From: ' + username
header = header + '\n' + 'Subject:' + subject + '\n'
msg = header + '\n' + text + ' \n\n'
smtpserver.sendmail(username, recipient, msg)
smtpserver.close()
username = raw_input("Sending gmail address? ")
password = raw_input("Sending gmail password? ")
recipient = raw_input("Send email to? ")
subject = "FRIDGE VIOLATION"
message = "Someone just opened the fridge door!"
while True:
reading = analog_read()
if reading > 0: #dark so timeout
GPIO.output(led_pin, True)
send_email(username, password, recipient, subject, message)
time.sleep(120)
GPIO.output(led_pin, False)
time.sleep(0.1)
sudo python fridge.py
$ sudo python fridge.py Sending gmail address? myname@gmail.com Sending gmail password? jkshdgfkayig Send email to? youremail@somemail.com
