Mikrovalovni detektor gibanja

LEBAN, EMIL (author), Vidmar, Matjaž (mentor)

Naloga opisuje zgradbo in delovanje na trgu dostopnega mikrovalovnega detektorja premikanja, ki zaznavajo premike objektov na osnovi Dopplerjevega pojava. Najpogosteje se taki moduli uporabljajo kot senzorji za avtomatsko odpiranje vrat v poslovne in javne prostore. Izhod iz mešalnika na detektorju je povezan na ojačevalnik signala, zgrajen na dodatnem nosilnem tiskanem vezju. Ojačevalnik poskrbi za primerne napetostne nivoje signala za odčitavanje na vhodu analogno-digitalnega vezja znotraj mikrokontrolerja. Na nosilno tiskanino je vgrajen Arduino Nano modul, ki ima vgrajene vse elemente za pravilno delovanje mikrokontrolerja. Arduino je prosto dostopna elektronska platforma, ki je osnovana na preprosti elektroniki in programskem okolju. Programsko kodo za obdelavo signala, izračun in izpis vrednosti na dvovrstični LCD zaslon sem napisal v Arduino okolju, kjer se za izgradnjo strojne kode uporablja C programski jezik.

• Language: Slovenian
• Keywords: radar, mikrovalovi, Dopplerjev pojav, detektor gibanja, merjenje hitrosti, mešalnik, dielektrični resonator, mikrokontroler
• Work type: Undergraduate thesis
• Organization: FE - Faculty of Electrical Engineering
• Year: 2016
• PID: 20.500.12556/RUL-85823
• Publication date in RUL: 27.09.2016

Secondary language

• Language: English
• Title: Microwave motion detector

Abstract

This work describes the configuration and operation principles of microwave motion detectors available on free-market. Doppler effect based units are most often used in automatic door-opener sensors used in public and business building entrances. The mixer IF output of the detector unit is wired to low-signal amplifier build on a separate motherboard PCB. The amplifier prepares the signal to suitable level for further signal conditioning by analog-to-digital converter which is built in the microcontroller. On the motherboard PCB there is also Arduino-Nano module which already integrates all necessary components for the correct microcontroller operation. Arduino is an open-source electronics platform based on easy-to-use hardware and software. The source code for signal reading by A/D, calculations using the Doppler formula and writing on the LCD was developed and built with Arduino IDE using C programming language.

• Keywords: radar, Doppler effect, modulation, mixer, intermediate frequency, speed measurement, microwaves