Design of a Monitoring System for The Number of Visitors in The Polinema Library

Abstract

In general, public spaces are places where people gather to meet in high numbers for the purpose of using facilities provided by the government, both free and paid.Since the covid-19 pandemic which began to enter the country of Indonesia on Monday, March 2, 2020 and began infecting Indonesian residents returning from abroad. After there were Indonesian residents exposed to the covid-19 virus, the government immediately handled it with a lockdown. The purpose of this research is to design a monitoring system for the number of visitors at the Polinema Library by creating a system that uses ultrasonic sensors to detect visitors who enter the library. The sensor is calibrated first by determining the tolerance value for the error value of the ultrasonic sensor. The arduino nano microcontroller will process the ultrasonic waves read by the sensor and display on a dot matrix with a size of 16x32 which there are 2 pieces. After that for data transmission media that will be sent to the adafruit for monitoring results and data retrieval results using the LoRa E220 module. Based on the test results, it can be seen that two ultrasonic sensors have an error value of 1.1 after calibration. In the process of sending data from the transmitter to the receiver using LoRa E220, the maximum range after getting an obstacle in the form of a house reaches 200 m with the power value received by the receiver