Can I use PWM (PIC RB3) to modulate an IR diode?

William At MyBlueRoom

New Member

• Apr 27, 2006

• #1

Can I use PWM (PIC RB3) to modulate an IR diode?

What I'm asking is if I set the PWM frequency to approx 38 KHz can I change the duty cycle to 0% and then 50% to modulate a IR command?

 

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akg

New Member

• Apr 27, 2006

• #2

Yes

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Apr 27, 2006

• #3

Yes, of course you can - but it's hardly worth while, it's simple to do it in software - and probably easier than accurately modulating the PWM.

From that diagram I presume you're only looking for a short range?, as the series resistor is so high.

 

justDIY

Active Member

• Apr 27, 2006

• #4

maybe this will be some help to you:

http://www.rentron.com/Infrared_Communication.htm

they have examples using both hardware pwm and software pwm solutions