Connecting the ground to both the left connector pads on the switch and shorting them together "presses" the button. I just want to make sure the hookup i have drawn there is the way it should be connected to that relay board?
So when i apply 5v to the pin 1 on the relay board (Arduino Digital pin 3 goes high) it will close the circuit in relay 1 which will act as if i "pressed" the button?
Just as you had it but don't connect the ground.
Essentially your push button is shorting out the relay contacts which I gather is what you want.
Be careful about the current as normally relay contacts can handle more than push buttons so you need a button that can handle the current you are expecting the relay to switch.
Grumpy_Mike:
Essentially your push button is shorting out the relay contacts which I gather is what you want.
If I understood correctly, it's the other way round - the relay is shorting out the switch contacts to allow the Arduino to simulate the button being pressed.
i saw this module but all the documentation i can find tells not much.
What i want to know is if i open the jumper and feed it with a supply if
both sides are really isolated.
Or is the Arduino ground always connected to the relay side?