Micro-Processor and Sonar Sensor based Predictor for Digital Health Display

An automatic technology was developed to determine the state of human health through Body Mass Index. The technology applies the sound wave property of an ultrasonic (sonar)sensor to determine the height of a human and sends the digitized value to the embedded Atmega 328P micro-processor, interfaced with a human digital weighing scale with load cells and Instrumentation Amplifier (INA) 125 for analog to digital conversion and amplification of the human body weight. The system then calculates the BMI and analyzes the value in health zones so as to determine the exact health status of a human. The collected information of height, weight, BMI and health is displayed on the liquid crystal display (LCD) and simultaneously stored in the memory module. The memory module can later be used to extract details of the surveyed population with a minimal human effort. This instrumentation minimizes the human effort while tedious tasks of health surveys especially in rural and remote areas. The developed setup was evaluated for 51 subjects and compared with manual measurement to check its accuracy. The observed values in the developed system did not differ at any significance level with the manually measured values.