Digitally programmable, custom automatic fish feeder for my tilapia
tank in my aquaponics system.
DC 12V LED Display Digital Delay Timer Control Switch Module
http://www.ebay.com/itm/DC-12V-LED-Display-Digital-Delay-Timer-Control-Switch-Module-PLC-Home-Automation-/310780966447?pt=LH_DefaultDomain_0&hash=item485bfd362f
AC 110V Digital LCD Power Programmable Timer Time Switch
http://www.ebay.com/itm/AC-110V-Digital-LCD-Power-Programmable-Timer-Time-switch-Relay-16A-/131196361423?pt=LH_DefaultDomain_0&hash=item1e8be99acf
A 12-volt timer switch would be better. Then you can use the backup batter to power the timer.
