Here’s a module that should be ideal to bridge your DIY projects to your Z-Wave network..
The Fortrezz MIMOlite is an interface / bridge module, capable of converting a digital or analog voltage input and/or a Z-WaveTM RF message input to a dry contact relay output and/or a Z-WaveTM RF message output.
The MIMOlite module provides one input and one relay output (isolated dry contacts, NO-COM-NC) and is capable of Z-WaveTM input/output/control. The system includes a program switch for Z-WaveTM inclusion/exclusion and an LED for various status indications. The unit is available in both European 868.4MHz and 908.4MHz USA frequencies.
The Fortrezz MIMOLite is available for around £65