Its An Automatic Fish Feeder / Powerhead or Airpump controller
Everyday I had to turn off my aquarium's powerhead/air pump and feed manually and turn on the air again after an hour. So I found very cheap alternative to make these process fully automatic.
Step 1: What You Need?
555 timer IC
AC/DC 12v Adoptor
Receptacle for food
Step 2: How its works?
I just hang the food receptacle In the aquvarium's hood, it has small holes in the bottom which small enough to hold or struck foods inside as long as stay still without shake. and attach a dc motor in it for make vibrate some seconds to drop foods, which controller by a 555 timer ic circuit triggered on by the hacked cheap alarm clock. so alarm'll automatically trigger 555 twice a day and 555 runs motor some seconds like 10 seconds in this circuit below. Normally these kinda clocks automatically snooze alarms approximately an hour. ie it took an hour to release the connection. so we can power relay switch through this and turn off the airpumps for an hour until foods clear off
Step 3: Hack Alarm Clock
In most of these kinda clocks we can find two leads which connects when the alarm times up. if you can't find one, just open it and find where to solder and get leads. make sure remember the gear wheels which where it goes. so that you can assemble it back together.
Step 4: 555 timer
Solder the 555 timer with resister and a capacitor according to the the circuit
Step 5: Step 5
Connect Motor and attach with receptacle
facilitate to attach it in the hood
Step 6: Step 6
Connect DC 12v Adoptor the the 555 and the relay switch parallely alog with alarm clock.
connect the AC jack through the relay for powerup the pumps triggered by the electronic relay switch.which gonna disconect when times up and turns off ater an hour or less