1 Page 1-4 © MAT Journals 2019. All Rights Reserved Journal of Digital Integrated Circuits in Electrical Devices Volume 4 Issue 2 Digital Measuring Tape Vishnu Rajan 1 , Astle John 2 , Divya Vinayan 2 , C Ashley Ismail 2 , Gayathri Suresh 2 1 Head of Department, 2 UG Student Department of Electrical Engineering, Sahrdaya College of Engineering and Technology, Kodakara, Kerala, India Email: astlexjohn@gmail.com Abstract Nowadays, all kinds of measurements require human aid in one form or the other for the accurate measurements to be performed, until the proposal of this device. The proposed device ultrasound sensing technology that transmit ultrasonic waves and receive them with the ability to output the time delay between the transmission and reception of the ultrasound. Hence using this method, one is able to measure the distance between two objects without physical means of measurements. The device automatically calculates the distance as per the programmed code and displays the distance measured in meters. The SI unit can be changed if needed for more precision. Keywords: Circuits, digital, distance, embedded, measurement, sensing, sensor, system, tape INTRODUCTION Accurate measurement of distances is very valuable information in the engineering industry. Hence, there is a need for an accurate method of measuring distances easily. This must be in a way that is different from the conventional measurement system that requires the need of an extra person to position the measuring tape to the level to which the measurement is to be taken. Digital measuring tape is a single person device that solves this problem. Digital measuring tape is the proposed device that enables the area of measuring distances with the help of an ultrasound sensor. The product contains an Organic Light Emitting Diode display which displays the measured distance. The measurement calculation works on the distance time formula. The ultrasound sensor sends ultrasound waves that obstructs the object placed in front of it, to which the distance is to be measured. The time required for the ultrasound wave to reflect back is calculated by the ultrasound receiver. Half of this time is used to find the distance between the obstruction and the digital measuring tape. This time is taken as the input for the arduino program which calculates the distance between the device and the obstruction and displays the distance in real time on the OLED screen. SYSTEM DESIGN Ultrasonic distance detection is the method capable of measuring the distance between two points using ultrasound waves. The device uses a 9V battery rather than a chargeable lithium ion battery to reduce the size of the device as well as the weight. This made the device a small light weight device that can easily be held in hand. The body of the device is made of 3D printed plastic PLA and is highly durable. The design was made to accommodate all the hardware parts of the device with the least vacant space. Hence, the device is compact and smaller making its usage and handling much easier than other devices. There are separate slots within the body of the device for the ultrasound module, the arduino Nano and the battery to be held in position. This is done so that the parts do not shake or wiggle around causing any hardware damage. The body of the device is a two-