I am software programmer and hobby farmer. While i was working on a hydroponic farming stuff, i had to use submersible pumps with timers. i dont want to buy timers that are actually tedious scheduling process. so i am making one myself.

I want to toggle 230v for ON\OFF a submersible pump(150-230V and 18W). I read that arduino may not able to supply enough input current that the relay requires. I am not sure about what transister to use to amplify the input current. I came across a circuit diagram and a relay board. help me if i still need to use transister and diode if i use this relays with arduino.

This is the 2 channel relay i am about to use and the circuit is below.

should i follow the circuit if i am using this relay ? The relay has tolerance of 250v. what if voltage fluctuates above 250v ? I am going to use a 9v battery to power arduino. Feel free to explain anything that i may have to know. Thanks for reading.