Portable height measuring device using ultrasonic sensor with tilt dumping sensor

Abstract

The aim of this research is to design a portable height measurement system using an ultrasonic sensor, based on the
height measurement device’s tilt detection using a tilt dumping sensor projecting. The operating principle starts with
checking for ground parallel using the values of linear acceleration and angular velocity obtained from a tilt dumping
sensor (GY-521). This is used as a starting reference for the ultrasonic sensor (HC-SR04) in transmitting and receiving
high-frequency sound waves as well as their time travelled to the microcontroller (ESP-8266). This is for calculating
the height and to display the results on the LCD screen. The height of a piece of cardboard was measured in
the laboratory at a distance of 50-200 cm in normal conditions and at room temperatures, ranging from 20-35 °C,
including the condition of placing the height measuring device inclined between 0 and ±10 degree. This confirmed
that the percentage error of the standard height measuring device was less than 1.00%. Furthermore, the test results
obtained from measuring the height of 50 volunteers, whose heights ranged from 119 cm to 181 cm showed that
the largest error was determined to be 0.72%, which is less than the specified error of 1.00%.