Hi,
I've been playing around with my fish tank and I'm trying to build a circuit to do a simple job - and I'm completely stuck!
I want to put a 3 wire SPDT float switch in the tank and use that to control the water change.
I have 2 pumps (one inlet one outlet) which I need to control.
I will control this circuit using a timer.
What needs to happen is as follows:
Power is applied to the circuit; it starts the outlet pump
Once the float switch gets low enough, it will stop the outlet pump and start the inlet pump
Once the float switch is high enough, it will stop the inlet pump - but crucially NOT start the outlet pump again.
Then the power will be disconnected. Next time the power is recconected - the whole process starts again.
Any ideas?
I'm thinking relays... but I can't work out how to do this - it's maddening me! I don't want to use any PIC's or anything like that... just want to use mains rated components.
Please help me!
I've been playing around with my fish tank and I'm trying to build a circuit to do a simple job - and I'm completely stuck!
I want to put a 3 wire SPDT float switch in the tank and use that to control the water change.
I have 2 pumps (one inlet one outlet) which I need to control.
I will control this circuit using a timer.
What needs to happen is as follows:
Power is applied to the circuit; it starts the outlet pump
Once the float switch gets low enough, it will stop the outlet pump and start the inlet pump
Once the float switch is high enough, it will stop the inlet pump - but crucially NOT start the outlet pump again.
Then the power will be disconnected. Next time the power is recconected - the whole process starts again.
Any ideas?
I'm thinking relays... but I can't work out how to do this - it's maddening me! I don't want to use any PIC's or anything like that... just want to use mains rated components.
Please help me!