Abstract
In recent years, the number of cars in China is increasing year by year. On
highways, streets, parking lot, garage and other crowded, narrow place when
reversing, the driver should be forward-looking, want to look back again, a bit
not careful collision occurs. Therefore. Increase the car rear view ability, detect
obstacles of developing the back of my car reversing radar has become a hot
research topic in recent years. Therefore, designed with the single chip processor
as the core, the use of ultrasound to realize non-contact ranging reverse radar
system. Work, ultrasonic transmitter continuously emit a series of consecutive
pulse,
For logic circuit provides a short pulse measurement. , the ideal measuring
distance of 0.5 m ~ 5 m, so mostly used in the close distance such as car
reversing radar. Design according to the principle of the reflected sound waves
in the air, and also introduces the ultrasonic range finder based on STC89C52
single-chip microcomputer. The design by the ultrasonic transmitting, LED
detailed introduces the ranging system hardware composition. Ultrasonic
receiving circuit using HC - SR04 transceiver discrete integrated ultrasonic
probe, the module consists of ultrasonic emitter, receiver and control circuit.
KEY WORD:Ultrasonic ； Measure distance ； STC89C52 ； HC-SR04 ；
Reversing radar
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