I needed to writ a rule to send some sort of notification if my kids leave our freezer open - I found some other articles but think my solution is simpler and easier to understand. While most refrigerator door alarms are designed to be compatible with various fridge models, it’s always best to check the product specifications or consult the manufacturer to ensure compatibility with your specific refrigerator.

I have an item which is type contact named StudyFreezerDoorSensor_OpenClose from a sensor thing on the freezer door (mine is a Xiaomi window sensor controlled through deconz zigbee adapter but any contact will do) that has the two states OPEN or CLOSED. Overall, this freezer door alarm is a reliable solution to safeguard your belongings and ensure the proper functioning of your refrigeration unit. With four modes to choose from, including General Alarm, Constant Alarm, Time Delay, and Doorbell, this alarm system is versatile and easy to use. Delay Function: Alarms with a delay function give you a grace period to retrieve items from the fridge before the alert activates. It sends text notifications to your phone, allowing you to easily monitor whether the door is open or closed.Magnetic Attachment: Magnetic attachment is a convenient option that allows for easy removal and repositioning. The WSDCAM Refrigerator Door Alarm is a compact and easy-to-use device that helps you keep track of your freezer and fridge door status. In our quest to find the most reliable and efficient refrigerator door alarm systems for 2023, we have carefully reviewed and tested numerous options. With its easy installation and long-lasting battery life, this alarm effectively alerts you if your freezer or fridge door is left open.

You will need the Ultimate Lithium Chrome 2032 batteries mind, as regular 2032 batteries seem to fail with the cold temperatures of a freezer. Delay Function: Wireless freezer alarm goes off if the freezer door stays open for 3/15/30/60 seconds, you can easily to set the delay time as your need. I prepared first with header male pins and made shield like thing on Arduino which will be easy to place on the arduino.

However, caution must be exercised to avoid accidentally triggering an extremely loud instant alarm. What’s important here is that if the refrigerator continues to work under this condition, it would reduce the compressor’s lifespan and cause it to malfunction. The secret is in the state of the StudyFreezerDoorTimer - it only triggers the alarm notification when it goes from OPEN to ALARM, but not CLOSED to ALARM, the expire timer sets a third state which I dont care waht it is only what it transitioned from - so it always shows the state as ALARM but that doesnt really matter. Plug-in: Some alarms can be directly plugged into a power source, eliminating the need for batteries. These 4 or 5-star reviews represent the opinions of the individuals who posted them and do not reflect the views of Etsy.