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Fridge Alarm with Delay
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CodeDalek
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Fridge Alarm with Delay

An alarm that will emit a shrill alarm if the door is left open for more than 2 minutes.  My kids (4 and up) open the fridge in the garage that we keep soda, juice and don't shut the door or is stuck open because the box of soda jams the door. This is similar to the circuit by Forrest Mims III with the difference that the alarm would not go off until a delay.

COMMENTS

user
captainron (Jun 24, 2012)

How long could you make the delay? What type of microcontroller/ timer would you use? Could the delay be adjustable? Check out my ROV project.

user
CodeDalek (Jul 06, 2012)

I wanted to make this a simple project for a beginner. I even increased the number of jumpers so that there would be a minimum of point to point wires. I asked Jameco if I should create a PCB but they thought that this would increase the cost. The design is based on a 555 and a RC timer. I could design a next level design that uses a PIC10F202 processor to create a design that would allow programmability but this might move the project up from a beginner and would need a programmed part.