Hoping to get some great advice from experienced sparkys.
I want to install a bell inside and/or outside of my house that is triggered (single 'ding') when a sensor is triggered - imagine a low powered optical laser that is broken as person walks up my drive. I want to position at least 3 of these around my house and can source the parts and install myself.
However, what do I need?
Any good advice you can offer me?
All is much appreciated