Re: Watch dog timer for Tiny Trak Four
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a great? idea? and good application !! cheers? Mike? ZL1BTB
On Monday 25 November 2024 at 08:02:22 GMT+13, Robert AD6XJ via groups.io <91710robert@...> wrote:
I like it! I did sort of a similar thing with my MT-AIO in my truck-- I didn't want to have to remember to turn the APRS on/off as I drove or parked and I wanted the unit at the rear of my vehicle, farthest away from my other transceivers in the cab and I didn't want to run additional wiring. My camper shell had a live full time 12Vdc line for the dome light and an intermittent 12Vdc line for the roof top (3rd) brake light. Using those two circuits, a 555 timer IC, and a relay I made a ¡Ö20 minute timer to turn on the APRS and keep it on as long as I step on the brakes at least once within the time period. It made for an easy installation and hands-free automatic turn on & off as I travel.
I can now never forget to turn it on when I go nor off when I arrive. ??
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