anyone tell me how a simple IR detector and a IR sensitive transistor work?? will they form the same frequency pulses that they received?
What you need is an IR receiver IC, they are three pin devices that give a logic output from a 40KHz (depending on device) modulated IR signal. Have a look at my PIC tutorials at http://www.winpicprog.co.uk, which use these in the IR tutorial. Even if you are not planning using PIC's, the hardware pages showing how to connect them will be useful, as will the descriptions of IR remote control.cool said:THanks~
Will the IR modulator filter the input ir signal which is at its center freq?
as I would like to set a carrier freeq (40kHz) and a modulation freq(250Hz) for the ir signals in the tx part by using 555~ if the ir modulator can filter the signal wihich is at its center freq(40kHz), then i can only do the demodulation of the modulation freq(250Hz)! is it right?? :wink: