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Post-box Monitor

Based on a Labs project | October 2011 | Find it here
In its basic version, the circuit in question remembers if the postman has been (it doesn’t actually detect the postman, but any kind of post slipped into the post-box by lifting the flap protecting the opening) and can indicate this ‘event’ visually (an LED) or audibly (buzzer or vocal alarm based on the ISD25xx).
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