Infrared Reflective Driving Distance Reminder Circuit

Published:2011/5/17 5:40:00 Author:Robert | Keyword: Infrared Reflective, Driving Distance, Reminder | From:SeekIC

The picture (a) is transmitter circuit. The picture (c) is HFC5212 chip. The picture (b) is receiver and sound circuit. The infrared transmitter's 555 and R1, R2, RP1, C1 etc. make up a multivibrator with frequency of f=1.44/(R1+2R2+RP1)C1. By adjusting RP1 to make the oscillation at about 40kHz, the infrared launch tube LED1, LED2 would have infrared modulated light when the sequence pulses square wave from 555 is low voltage level. The infrared receiver uses the infrared special integrated circuit CX2016 (or KA2184) which has front amplifier, carrier frequency selection, pulse decoder circuit and so on. By adjusting RP2 to make its internal bandpass filter's central frequency be the same with transmitter frequency. When the infrared receiver tube D3 has received the reflected infrared light, IC2's output voltage becomes low voltage level to trigger the IC3 to be set mode.



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