Designing the control scripts
Before we start writing the scripts to control our alarm systems, it is probably a good idea to outline the high-level process for the system. The following flow-chart helps us picture how our system should work, and the various logical decisions our script needs to make.
The flowchart might look a bit complicated with all its lines in different directions, but it's actually pretty linear and in a downward direction. Referring to the flowchart, it shows the following tasks that the control script will be doing:
Sitting quietly until the system is armed either by the hardware key switch or the web-based panel's soft switch.
When the system is first armed, it will sound the exit buzzer for a pre-determined amount of time before actually arming the system. This gives you a chance to leave the property or disarm the system again, before it starts monitoring the inputs.
Once the system is armed, the armed LED will be switched on and the system will wait to see if any...
