This is the bad economy, we will find ways to better protect against identity theft, I recommend this circuit to help you. Burglar alarm systems Fridge door Alarm Beeps if you leave open the door over 20 seconds 3V battery operation, simple circuitry This circuit, enclosed into a small box, is placed in the fridge [...]
The unit was easy to test and install and has a range of about 100 feet. For basic testing, temporarily connect the power and ground wires and listen to internal relay clicks while pressing lock and unlock buttons on one of the remotes. To get a good range, it is important to place the antenna [...]
Beeps if you leave open the door over 20 seconds 3V battery operation, simple circuitry This circuit, enclosed into a small box, is placed in the fridge near the lamp (if any) or the opening. With the door closed the interior of the fridge is in the dark, the photo resistor R2 presents a high [...]
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