Nobody wants their favorite food to get spoiled especially due to the technical problem of the fridge. A refrigerator without a latch is an inefficient AC and also an unproductive product as it doesn’t perform what it has been made for. Now, if you are struggling with the problem of a defective latch of your fridge which is not letting your fridge close properly, then here is a remedy from Dane Peterson. With the help of an Arduino, he has built an alarm that will gain your attention when the refrigerator does not latch every time it is closed.
With the help of Hall Effect sensor and a neodymium magnet attached in the alarm, which senses the refrigerator door when it is opened. The alarm starts ringing after Arduino starts counting down for more than a minute until the situation is addressed.
In order to build your own fridge alarm, you will need Arduino Uno, a non-latching and Omnipolar Hall Effect Sensor, magnet, Piezoelectric Buzzer for notification and Arduino ProtoShield. Uno is the brain of this project while Hall Effect sensor senses the magnetic field to make non-contact switches. Arduino ProtoShield makes the process of breadboarding the circuits convenient.
Further, you will need tape, wires, an LED for testing, a USB cable for uploading sketches to Arduino, longer wires for permanently installing an alarm, and a power adapter so that Arduino can run without being plugged into a computer.
As the circuitry for the fridge alarm is basic in structure, wiring it up is not a behemoth task. The architect has also sketched the wiring in Fritzing, which is an open-source electronics diagramming tool, it makes circuiting easier. The Arduino codes are available in the zip format on the website, where two third-party Arduino libraries, Bounce and Tone are included
The code is tested by moving the magnet in the range of the Hall Effect sensor, to simulate the fridge door opening. While testing LED should light up and after some time, the alarm should go off. Finally, the fridge alarm plays your favorite charts through a piezoelectric buzzer. The project is simple, as you just have to download the code, wire up the Arduino, upload the sketch to your Arduino, and test it. Get complete details from the following website.
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