TY CONF TI DEVELOPMENT OF RANGE FINDER BASED ON ULTRASONIC DISTANCE SENSOR HC-SR04 KW range finder KW timer KW front interruption KW seven-segment indicator KW microcontroller JO CAD/EDA/SIMULATION IN MODERN ELECTRONICS 2021 AU Klyamerov, K.P. AU Lysenkov, A.A. AU Amelin, S.A. PY 2021 PB Bryansk State Technical University