Abstract
Technological developments that are so rapid nowadays make people want to always be creative and trigger to create something new which can be applied and can be used easily and practically and can be controlled from close and long distance. In this research, what can be adopted is how to design a home security system using a microcontroller-based PIR (Passive Infra Red) sensor. Where this security will work if the PIR sensor (Passive Infra Red) detects the presence of unwanted humans into the house, and then the microcontroller processes and instructs cellphone 1 to send alarm signals in the form of SMS (Short Message Service).
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