Infrared reflection car space reminding circuit diagram

Published:2011/6/24 3:53:00 Author:Nicole | Keyword: Infrared reflection, car space, reminding | From:SeekIC

A multivibrator is composed of infrared transmitter's 555 and R1, R2, RP1, C1, the frequency is f=1.44/(R1+2R2+RP1)C1. The resonance can be about 40kHz by adjusting RP1, when the sequence pulse square wave which is outputed by 555 is low level, infrared launch tube LED1, LED2 emits infrared modulated light. The infrared receiving adopts infrared special integrated circuit CX2016(or KA2184), it contains preamplifier, carrier frequency selection, pulse decoding circuit, the internal bandpass filter's center frequency f0 is coincidence with transmitting frequency. When the infrared launch tube D3 receives the reflected infrared light, IC2's output turns to low level, IC3 is triggered, and it turns to set state.



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