Motion Detector with PIR Sensor


Posted on Feb 4, 2014

this project use PIC18F25K20 microcontroller to detect if the sensor change state and it will emit a sound from the speaker or piezo, the MCU also detect the voltage of the battery in the startup, the algorithm it s very simple use an interrupt on change to detect the change on the PIR sensor. Power On - when circuit start, a delay come to MCU ge


Motion Detector with PIR Sensor
Click here to download the full size of the above Circuit.

nerate a unknowed state, to avoid circuit malfunction, R6 and C1 make a RC delay filter, calculate delay with:




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