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The system made up of 16” x 16” x 2” cushion connected to the timer that will activate the buzzer. There are 4 LDR sensors and 4 LEDs sandwiched between 2 inches foam cushion and programming will be done on Arduino Uno microcontroller to make sure the timer will start counting time once all LDR sensor covered (patient sit on cushion) and not exposed to light. Subject can choose between three modes which are MODE1/MODE2/MODE3 at the beginning of PRA.

Mode

MODE1 (Low)

30 minutes interval

MODE2 (Medium)

20 minutes interval

MODE3 (High)

10 minutes interval

Block diagram

Theory

Based on our experiment that had been conducted we know that light can really dispersed inside foam material because of porous physical structure. in this case, we can place LDR inside the cushion as it can detect light that come from the LED.