So my Problem is that i have to run a Pump both ways (two relays) is there any module wich can do both ? it runs with one relay when i need it but now i need it to run in the opposite direction too.
Any two channel relay module like this will work
https://www.amazon.com/SunFounder-Channel-Optocoupler-Expansion-Raspberry/dp/B00E0NTPP4?th=1
Describe you pump. Is it powered by DC or AC. Switching direction on a DC pump is easy, as noted in jim-p posting. BUT!!!! Is your pump designed to work in two directions?
Its a dc pump it can run both directions already tested that
ok i´m going to get one and try to get it working
OK the pump is DC so what voltage and what current?
How did you want to do this? Can be as simple as a DPDT switch, using an H bridge or using a pair of relays. Much of this depends on your pumps voltage and current demand.
Ron
If going the relay route, check the DC current rating (which is usually just a small fraction of the AC voltage rating).
Also you may want to add a flyback diode on the motor to lessen the load on the relay contacts, which in case of a reversible motor amounts to a bridge rectifier.
If you're using a motor driver (H-bridge) you don't need this.
If you are pumping liquid, remember to STOP the pump before reversing directions. Otherwise you will break the pump impeller.
i want to use 2 relays the pump is running 8-12V DC (350mA at 12volts) i dont know what a DPDT switch is.
already in the Programm
i dont know what a flyback diode is, and what is a (H-bridge) driver ?
All those terms you can easily find on Google... if you don't understand part of it or how to apply it to your pump, do ask.
Just for future reference a DPDT Switch is a common Double Pole Double Throw switch in switch speak. The idea be it a switch, relays or an H Bridge is to simply reverse supply power to the motor. Using a DPDT switch and applying it in schematic it would look like this:
Paul provided an example using a few relays.
Ron
Flyback diodes are D1 and D2 in this drawing, they suppress the "kickback" spike from inductive loads.
@Patrick_2
Turn on one relay to make it go one way
Turn on the other relay to make it go the other way.
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