Gainfully deployed Homemade-temperature-humidity-pressure-and-light-sensor
I had a need for a contact closure sensor with a robust input. I tried a Visonic Contact sensor but adding external wires made the device generate false triggers.
So, using Iman's V1 board I added a LilyPad LED to the board facing the illumination sensor. Now the external contacts would be isolated from the board workings. Kind of a poor man's opto-isolator.
In my case the contacts being monitored are Oil Fired Boiler Lockout, indication the burner did not start and the system is shut down until manually addressed.
I modified the DH, creating a new capability named "contact" which I can monitor with HSM and a heartbeat function which currently only creates a log entry.
So far it is working great