Suggest me a Sensor Please!!!

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hi,
i need effective light sensor can recognize interruption between tx , rx. ir sensor, ir sensor using rite not working due heavy lighting in room. distance between tx , rx approximately 3-4 feet.

what trying is, when ever people cross tx,rx message board "merry christmas" must pop up. ive figured out else, except sensor. please me this.

and sorry if missing obvious!! naive sensors. tried google , couldnt find 1. appreciated

thanks in advance..

ir remote controls avoid interference ambient light modulating sender @ 40 khz.  receiver has 40 khz bandpass filter ignores signals not modulated @ (or near) 40 khz.  can use 555 timer chip add modulation sender , use remote control receiver detect it.


Arduino Forum > Using Arduino > Sensors > Suggest me a Sensor Please!!!


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