I purchased a door alarm that has one of those magnetic switches that attaches to a door and the door frame.
When I close the door, the alarm does not stay on because the magnet is activating the reed switch.
How can I modify it so the alarm stays on (for a pre-determined time or not) after the door has been shut?
I was thinking of using a 555 but not sure how to wire it up.
Thanks.
When I close the door, the alarm does not stay on because the magnet is activating the reed switch.
How can I modify it so the alarm stays on (for a pre-determined time or not) after the door has been shut?
I was thinking of using a 555 but not sure how to wire it up.
Thanks.