December 2015
A router and modem at a remote location periodically lock up, requiring a reset by unplugging to restart. Is there a simple circuit I could use to drop a relay out for about 30 seconds, every 24 hours? The relay contacts would be wired to drop out the power circuit to the devices. That way, when it does lock up, at least it would be reset again within a day.
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Get an inexpensive 24 hour timer and adjust it so it is on for as much of the 24 hours as you can. If that provides a short enough off time, you are done. If not, you can do the following. Make a 555 monostable timer circuit to energize a relay for about 30 sec. Circuits to trigger a relay using a 555 can be found in many places. Power the 555 circuit using a (surplus) wall cube plugged into your 24 hr timer.
Power your equipment through the relay contacts (but not through the timer) so that when the relay is in the de-energized state, your equipment is on. When the 24 hour timer turns on, the 555 timer will go high for about 30s, energizing the relay which turns off your equipment for a short time.
You may not have resolution down to 30 seconds, but a simple light switch timer would do the job. Set it to switch power off in the middle of the night or at a time of minimal use.
You could use this timer designed for resetting a router on a timed schedule! It is a plug in timer! www.amazon.com/NetReset-NR-1000US-Automated-Cycler-Routers/dp/B00HUEU9H8
You can try this particular timer from Amazon www.amazon.com/Digital-Programmable-Socket-switch-Energy-Saving/dp/B00WHPNON6/ref=zg_bs_495340_1 Or, Google for household lamp timer, there are many available.
