Relays [220V]

[Rihards Veips]

 I am working on a project at my school for a lighting show in my
city in November.
I will probably be using an Arduino and build something similar to a LED
cube but it will be a transistor cube that will be turning on relays. The
relays will turn on 220V 7W LED lamps, but I don't know what kind of relays I
need. Can anyone help me please?

[electronics man]

AC or DC

[Rihards Veips]

AC

This is the electronics store I buy things from (Relays): https://www.elfa.se/elfa3~en_en/elfa/init.do?toc=18721&name=Relays
Not sure if the link will work...

[madires]

Ok, so you want to switch 220V AC. Will each relay switch a single 7W light or multiple in parallel? That way we determine which load the relay has to support. The relay type will be a SPST (Single Pole Single Throw). The next point is the driving voltage, typically 5V, 6V, 12V or 24V. Please choose one based on your power supply.

[Rihards Veips]

Each relay will switch on 1 light.
Driving voltage: 5V

[electronics man]

It's very easy to find a relay with your specs

[Rihards Veips]

Yes, but I don't know if the relays I found are not too powerful(higher price) and I don't really know what kind of relays I need - Solid state or signal ect..

[madires]

Please look for power relays. Since you switch just 7W any relay supporting >=1A should be fine, like https://www.elfa.se/elfa3~en_en/elfa/init.do?item=10-573-78&toc=18836.

[Rihards Veips]

ok thank you