bubsterboo

The solid state relay I used has an integrated optocoupler. The driver end is an LED like an optocoupler. Looks like a similar part, I believe mine has a mosfet on the switch side, but I'm sure either work for this application! https://www.mouser.ca/ProductDetail/Omron-Electronics/G3VM-61A1?qs=FGnoE8EzQwuo0pqKalkj6w%3D%3D Interstingly. I first started this project like Linus, thinking I could just use a relay on the wires going to the wall unit. I quickly learnt that's not the case. So I thought "Oh this must be some clever serial 2 wire w/ power protocol then, no worries, i'll use the ESPs UART and send the bytes needed". After hooking it up to an osciloscope and learning what it's doing. It is a serial protocol over the 2 wires, It's not actually wireless like Linus was told. But it uses Liftmaster's "Security+ 2.0" protocol which has a rotating code. So it's rediculously complicated crypto for a internal wired switch!!! This seems totally overkill and made me pretty frustrated, which led me to this solution.

Hey Linus, I went through a pretty similar adventure. With a Chamberlain garage door opener in the lower mainland. I ultimately opted for a Relay style approach in a similar way: https://imgur.com/a/GGhkcT2 But I put a Solid State Relay on the board quite close to the button. I also used physical reed switches on the door to know when the door is fully opened or closed. The button and 2 reed swtiches were wired up to an ESP32 PoE. I chose to wire it to ethernet instead of using Wifi. Its programmed with EspHome: https://esphome.io/components/cover/index.html This works natively in Home Assistant, knows when it's open or closed. And unlike the MyQ service it doesn't require an internet connection. You'll find on the homeassistant subreddit that the MyQ integration is quite popular (likely because people arn't left with much of a choice). But it often goes down because its a cloud service and MyQ will often change their API without notice breaking the homeassistant integration. So you'll eventually findout that MyQ doesn't always work either! I have been using this esphome solution for about a year and half now and its been rock solid.

Hello, I have a house in the lower mainland and would like to get the same style of mini split air con installed. Is Brian's contact info available anywhere?. Is he interested in doing another installation as a contractor? Edit: Brian's a cool guy and got back to me via pm. Cheers, bub.