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Automatic fertilizer feeder for aquarium

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Vermes

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This useful device was made of:
  • a bottle
  • an engine from car washer
  • pressure compensated dropper
  • second relay
The time on the second relay is set on the relay for 1-99 seconds. The device is triggered by an impulse from the scalar controller (timer). It means that for example at 8p.m. The scalar controller activates the power steering, which gives an impulse to the second relay. Then the second relay activates the pump for the time set. To make the measuring of the fertilizer portion easier, the dropper was calibrated in a way, that one second of engine work means 1ml liquid given.
The housing was glued by foamed PCV.



Link to original thread (video) – Automatyczny dozownik nawozu do akwarium
 

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