I recently moved into a condo that has a 4 wire intercom system to open the front gate and front common area door. The condo association isn’t interested in upgrading the system and the damn thing annoys the hell out of me. It’s so archaic, especially since the building is new and everything else in the place is fully automated. The in-unit control is a Pacific 3404 and uses the common 4 wires and has three buttons: Talk / Listen / Door. Additionally, the building also has a DVR system that I plan to integrate into Blue Iris, but that’s a project for another day.
Ideally, I would like to leverage SmartThings to buzz people in using my iPhone as well as a MagicMirror project that I’m building. Eventually, after I hook the cameras into Blue Iris and that into ST, it would send me the notification with the camera stream or a still image of the front gate.
In any case, I’m really surprised there’s not a “smart” type upgrade for this of system because I’ve seen these same systems in so many apartment / condo complexs in every major city. Like me, not everybody can put in a Ring or something similar - especially in the common area. It’s an untapped US market. The closest thing that I’ve come across are the Nello One and Klevio - both of which are only the in the EU. Likewise, there’s tons of posts here and other forums from people looking to do the same thing.
One in particular written by Chris Whong appears to be the most promising: https://email@example.com/connecting-an-apartment-door-buzzer-to-a-smarthome-hub-4664cf6a3ce4. Unfortunately, I’m really light on the electronics knowledge, but I want to give this project a try and I’m having trouble finding the relay that he used. It’s just not manufactured anymore. I have his code on Git (https://github.com/chriswhong/mimolite-door-buzzer) and I’m ready to pull the trigger on the MIMOlite. (https://www.fortrezz.com/shop/mimo-lite).
Option 1 - I find a replacement for the RY014B. I’ve done some digging and the board was primarily used for hooking up an external signaling device like a strobe or flasher to the intercom. I did come across some possible alternatives. https://www.aiphone.com/wp-content/uploads/RELAYS.pdf . Would any of these work? Any alternatives? Cheaper?
Option 2 - I make it myself. I mean, I can solder and if given a parts list, source and some simple instructions, I probably can make the board (When I was like 10, I recall making a light pen for my Commodore 64 from a guide in PC Mag, so I do have some skills). Although it’s a very simple circuit, I just have no idea how to read schematic and translate it into parts.
I’m not 100% committed to Chris’ approach, but again, seems like the easiest provided I can find a replacement for the relay. If anybody has a better way of achieving my integration goal, I’m open to considering it. Which every approach works, I most definitely will post a guide here.