Using a 6v power supply to control a water pump

[vincey_cy]

Im quite new to electronics in general so I'm sorry in advance.

So I would like to control a water pump,
Specs of the water pump:
Operating Voltage: 2.5-6V
Operating Current: 130~220mA
Driving Mode: DC, Magnetic Driving

The relay I would be using is a 1 channel 5V relay.

I would like to ask with the diagram below, if use a 6v power supply instead of the 9v battery, will the system still work? Or will it damage anything?

If so, what are some things that I need to make the system work?

[jim-p]

@vincey_cy

if use a 6v power supply

6V battery like 4 AAs?

[vincey_cy]

a 6v wall adapter

[jim-p]

@vincey_cy

a 6v wall adapter.

Then a diode across the pump will protect the relay and power supply

[vincey_cy]

Okay thank you! Is that all I need?

[vincey_cy]

Also may I ask what the diode is for?

[jim-p]

To protect the relay and power supply from voltage spikes.
It's all you need.

[vincey_cy]

Alright thank you!!

[vincey_cy]

Also with this set-up, do I still a power source to power the arduino separately?

[jim-p]

Yes.
You can power the Uno with 7 to 12V connected to the barrel jack or Vin or 5V connected to to the USB connector.

[vincey_cy]

Since I only have a 9v and 6v adapter, can I use the 9v for the pump and 6v for the arduino?

[JCA34F]

6V is not high enough to power Arduino through VIN or barrel jack, needs at least 7V. Power Arduino with 9V through VIN pin or barrel jack, pump with 6V adapter.