About the article

Post-box Monitor

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).
Downloading of this magazine article is reserved for Elektor Members only.
Already a member? click here to log in.
Loading comments...