Sunday, 7 June 2015

Refrigerator Light-activated open door Alarm

13:18  Telli k  No comments

This audible / visual alarm circuit will start a short time after light hits the LDR (light dependant resistor) . If the alarm is inside the refrigerator, it will be triggered by external light (when door is open) and by the internal lamp. It is a very common habit to leave the refrigerator door ope...
By: simpletronic

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from Instructables: exploring - technology - robots http://ift.tt/1Inw3PX

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