Student Final Project Need help

[sougata]

Hi,

He is actually querying for the IR extender part. Its good that he wants to use a microcontroller. Otherwise he could just use a 555 timer IC to generate the 40KHz for lighting up his IR LEDs. Marco please note you need a duty cycle between 10 and 20 % to get effective IR beaming. And your receiver expects that. That is receivers (depends on which one used) may fail at a 50% duty cycle.

For the 555 thing try this link http://wolfstone.halloweenhost.com/T...TimerCalc.html also most receivers are centered around 38KHz not 40KHz. Use the reset pin (4) of 555 to switch on-off your IR.

For a PIC choose any one that has got a Hardware PWM model and few lines of code should. A quick recall 16F819 , internal oscillator HPWM.

P.S. - Marco it is high time to learn a micro. If your college does not have a copy of PBP ask them to get one. You will find many people here extending there support.