The circuit in Figure 1 is a simpler and safer device than a similar one I recently read about (Reference 1). A few years ago, I built the circuit that this Design Idea describes, and the gadget still ...

Use this refrigerator alarm circuit to prevent leaving the fridge door open by sending out an alarm signal every time the door is left open for some time. The sensor of the alarm is an LDR. After a ...

For anyone who gets a late-night craving for anything out of the refrigerator and needs some help in the willpower department, [Claudio] may have the project for you. He has just finished work on a ...

Not properly closing a refrigerator door will no doubt invite huge electricity bills. This gadget is an alert device that beeps if you leave the refrigerator door open for more than 20 seconds. When ...

I never thought of this before…and I must say that I’m impressed! This Reddit user came up with a pretty amazing idea to make sure her partner closed their refrigerator…check it out in the story below ...

A previous Idea for Design, “Alarm Sounds When Refrigerator Door Remains Open Too Long,” draws power for its operation by modifying the refrigerator bulb wiring. This may not be acceptable, ...