Relays

Hello!
I've set out to make a thermostat with a simple threebutton user interface and two LEDs and a 2*16 LCD display for information / response.

I've got it all toghether in a way, but one thing I've compleatly forgot about:

-How do I complete or short- a 230 volt circuit, using a 0-5 volts control signal?

And what if i need to control only 12 volts, using a 0-12 volt control signal?

I have peeked around, but I've not yet had any succsess finding something that explains this in a way that I can relate to / understand.

-Alexander

take a look of this:

I've seen that diagram, and it's for DC, I'm going to use AC.

I'm guessing it's a difference?

Greetings,

There's a difference between the relay coil and the relay contacts — which is the whole point.

You can buy relays with almost any coil voltage between 5V and 240V (or more) either AC or DC. These relays are available with gold-plated contacts rated for a few milliamps to huge copper buttons rated for hundreds of amps.

Good luck!

There is a structural difference between AC and DC relays, but I don't think there's a difference in how you use them. Just buy the correct relay for your task and the tutorial should apply.