Tell me where to buy / how to make a DC light timer
September 8, 2013 5:06 PM Subscribe
Our chickens [!] have trouble hopping up on their roost at dusk. We have glued a keychain LED to the inside of the coop and have been turning it on every night, and then off when they are roosting. I would like to have this turn on automatically at dusk and then off again an hour later. If this were AC I would buy a timer from the dollar store. For DC do I need to build something?
posted by Acari to technology (8 answers total) 1 user marked this as a favorite
If we had a single power outlet on the outside of our house, we would plug in a trouble light and use a timer, but we don't have any outlets outside. If we wanted a DC light to turn on at dusk and stay on, I would put a solar garden stake light in/on the coop somehow.
How do I make a light turn on at dusk and then turn off in an hour or so? Solar would be best, but I have rechargeable AAs, AAAs, and 18650s. One little led run off a 3.7v cr2016[x2] is plenty bright for this operation, but if there is a sub-$20 item that I could buy, that would be good, too.
The plan that I have right now is probably stupid - modify a solar garden stake to charge a battery with a much smaller capacity so that the battery drains very quickly.
[I have just started my first teaching position, so suggestions with arduinos and 555 timers, while welcome, will be ignored for at least a few months.]