A fridge door alarm circuit using 555 timers senses the status of a fridge door being open OR close. It beeps if the fridge door is left open for too long or hasn’t been closed properly, in order to stop food from spoiling. There are lots of other implied uses to this circuit as well. A refrigerator or freezer door that is left open or ajar may cause the food contents to spoil. So today in this tutorial, I am going to show how to make a simple fridge door alarm circuit using 555 timer IC

Hardware Required

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Solder Base of Both IC’s 555 Timer

Place IC In Base

Solder All Resistors

Solder Capacitors (Ceramic & Electrolytic)

Solder Diode & LED

Solder LDR & Buzzer

Finally Solder Power Connector

Let’s Power up the Circuit

Circuit Diagram