Shelly Uni - 12 volts in, 7 Volts out

qmatthew

Hi,

I am using a uni to control a front gate with a dry contact. The gate works fine when a regular manual switch is connected. When I connect the uni up to it and switch it via the app the gate just buzzes but does not always open. The gate is on its own power source from the shelly and has 12 volts coming in...yet when measuring the power going into the gate it is showing about 7 volts. The power 12v has the positive to the gate, and the negative traverses the shelly uni .. so the shelly is switching ..just doesn't seem to be getting the voltage through to open the gate.

Does anyone have any thoughts on why the voltage is dropping ?

Appreciate your help and thank you in advance.

Loetauge

The voltage drops at the semiconductor switch, which may only switch 100mA. Use a small relay to control the gate. think of the diode in parallel with the relay.

qmatthew · viber_image_2022-09-19_08-58-30-998.png

Thanks for the reply - appreciated.

So I'm basing my wiring on this diagram from another thread in this forum (attached).

For the relay - is this the sort of thing I would be after assuming the correct voltage and amp between the relay and the gate?

Ebay Relay Link - https://www.ebay.com.au/itm/1953542265…&frcectupt=true

Thanks again - appreciate your help !

Loetauge

I think the button is normally open, the relay is then also normally open and is connected in parallel to the button. So the scheme is not correct yet.

2 wires from the relay to the button and voltage to the UNI to switch the finder relay. The finder relay must not have more than 100mA current consumption.

qmatthew

Thanks again.

For the relay - is this the sort of thing I would be after assuming the correct voltage and amp between the relay and the gate?

Ebay Relay Link - https://www.ebay.com.au/itm/19…R_a2u63qYA&frcectupt=true

Shelly Uni - 12 volts in, 7 Volts out

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