Development Of Physiological Information Detection System For Toilet

This paper introduces the structure, operating principle, hard-ware design and software control process of the physiological information measuring system during toilefing. The system is installed on a toilet. Four high-precision weighing sensors are installed on the bottom of the equipment. The pressure device and photoelectric sensor are installed on the area that locates under the right leg’s arteria femoralis of toilet seat.Weight and excretion can be measured by high-precision weighing sensors. Excretion rate can be measured when the weighing sensors are working with PIC18F452 MCU.Blood pressure and heart rate can be measured by mechanical pressure device, pressure sensor and photoelectric sensor when the PIC18F452 MCU controls them.We use 24 bits ADC and use the same regulated power supply as reference voltage of ADC and driving voltage of weighing sensor.So that big range high-precision measurement can come true.In other word, weight, excretion and excretion rate can be measured by the same set of sensors.During measuring blood pressure we use double helix mechanical pressure device to increase pressure.The problems of complex and uneasy to clear when using cuff to increase pressure are solved by this way.It also reduce the touch area between the equipment and body.The high-precision photoelectric sensor which is made up six LEDs and three photo diodes can measure the pulse wave of leg’s arteria femoralis effectively.It provides guarantee for the accuracy of blood pressure measurement.The experiment results show that the result of the toilet physiological information measuring system is precision.The measurement of unconsciousness and unrestrained weight, excretion rate, blood pressure and heart rate is realized by this system.