I have a standard alarm system in my home using a selection on reed switches and PIRs. These are all wired back to a control panel via 6 core cable; 3 pairs, power, tamper and trigger. I also have a Fibaro HC2 delivering home automation and secondary alarm functions.
Adding a Fibaro Universal Sensor to an existing PIR adds Z-Wave functionality that can then be used for scene triggers and alarm functions. In addition a temperature sensor can be added to give a room temperature reading.
I’ve always love getting my electronic kit out but just don’t seem to get the time any more. It’s so bad that when I got my breadboard out to build this project out it still had my university project still on it! First job strip the board 😦
So once striped I connected up the board as per the circuit diagram below:
Adding the power and it all seems to work as required, triggering the alarm on motion and tamper:
The next phase is to install the universal sensor into an existing PIR as I’d used a spare for testing:
At this stage I also poked the temperature sensor out of the bottom of the PIR. It’s not the best position for a room temperature sensor but it gives a guide. The Universal Sensor tucks quite neatly out of the way at the top of the PIR:
Full testing at this stage with the existing alarm failed as there was a tamper fault. There were two ways to fix this; firstly reconnect the tamper circuit direct to the PIR and not use half of the Universal Sensor, or bypass the tamper circuit in the PIR for the main alarm. The following diagram shows the latter and the option I went for. This way the Fibaro alarm is triggered by movement and by the PIR being tampered with, i.e. the cover opened. The main alarms tamper alarm is still triggered if the cable is cut/broken.