if you have a garage door you like to open using you mobile phone. Easiest option is using Shelly 1. It has dry contact relay meaning supplied power will not exposed to any voltage. It works as on/off switch. We will discuss 2 options today.
Option 1: Get AC power from main
We will need an Ac plug & Double adapter (if connection point not available)
Option 2: Get DC volt from exposed output
How to identify the connection for the switch?
Go through the product manual and identify the contact points for push switch or dry contact points. Following example we can use Pin 1 & 2 for our Shelly dry contact relay.
Shelly Apps settings
Go to app settings and activate Auto off after 1 sec. This will make sure the button is activated for 1 sec only.