I want to make one of my ADT sensors visible in Smartthings and also keep it in ADT. I was thinking that the Konnected Interface Board might make this easier to do. But I didn’t want to invest in the full blown Konnected Interface Kit that handles 6 inputs. So the normal Konnected solution is more than my budget. Or is there any easy way to do this cheaply, say for ~$30? I could easily connect an ADT sensor to ST by disconnecting it from ADT (or any alarm system), but having it work in both the alarm system and ST is what I want to accomplish at a low cost.
Ok, there’s cheap, and then there’s, um, makers. LOL! 
Sure, if it’s only one sensor you can connect it to anything you can cobble together that will be recognized as a detectable device in smartthings, and you might be able to save some money that way.
I would look into ST_anything using an arduino and an ESP 8266 as one possible do it yourself option. (The topic title is a clickable link)
@ogiewon might have some more thoughts.
If you want to go even simpler, look for some physical event that occurs when your ADT system is triggered, whether it’s a light coming on or an LED changing color or a sound and then just find a sensor that can recognize that.
For example, here’s a sensor designed to trigger when a small indicator LED changes:
But there are lots of other devices you can use depending on the exact details of what changes in the physical environment. 
My answers to my own question:
- My door sensor is wired to the ADT alarm panel. If I wanted to have it work wit ADT and display in SmartThings (ST) the following steps would provide a solution. 1. Disconnect the door sensor wires from the ADT panel and connect it to a wireless contact sensor that is connected to SmartThings. For my wireless sensor I am using a door sensor that I removed the reed switch from and connecting to where the reed switch was. 2. Connect a SmartThings compatible switch that is wired into where I previously removed the wired door sensor from the panel and using the EOL resistor that was located at the panel. 3. A SmartThings automation would be used to activate the new alarm panel switch appropriately when the new wireless contact sensor is open or closed. ESTIMATED COST: With a sensor and switch and terminal block and buck voltage converter to replace batteries this comes in at about $40 CND from AliExpress or Banggood. I could also use a Mimolite which I think I paid about $70 for, this has the dry inputs and dry outputs in the same package.
- The most elegant solution is to use Konnected with the Interface Board which I may eventually do unless a better idea comes along. Refer to the attached information from Reddit:
[https://www.reddit.com/r/SmartThings/comments/6r6e60/hook_up_your_wired_alarm_system_to_smartthings/]. It is possible to flash Konnected to a NodeMCU esp8266 but it seems that nobody has got this to work with Konnected’s interface board.
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