DIY home security system

If you have some real value to protect better use of a professional solution like from vivint home security systems. In other cases, you need to rise a security level homemade security system may do well enough.

assembled PCB

Here it is – a PIC16F877A microcontroller-based Alarm device that has quite some features, including the ability to dial phone numbers with a DTMF generator, a couple of sensor interfaces with selectable sensitivity, up to 5W audio alarm output, RS232 interface. Additionally to this, there is a light sensor that enables switching light depending on ambient light. PCB is one sided with through-hole components – it shouldn’t be hard to build one. The last job is to wire the house – there is also a laser barrier option present. [Source]

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