Generate 38KHz signal using pic 16F877A

[rado]

friends,
how to generate a 38khz pulse signal ,to operate the IR LED using pic16f877a?
i need a code for micro c:-|

 

[Kripton2035]

what is the frequency of the pic ?
what is the language you would use ?
what is the tolerance for the 38KHz ?

 

[rado]

hello Kripton ,
The maximum operating frequency is 20MHz and i uses an 8MHz crystal oscillator.
language is c
tolerance , i couldn't understand it , could you please explain it?

 

[hexreader]

Something like this maybe?

// simple 38 kHz PWM generation for PIC16F877A
// check PWM library selection in IDE
// PWM output is on RC2
// ensure oscillator settings are correct in mikroE configuration settings

void main() {

    PWM1_Init(38000);             // turn on PWM at 38kHz
    PWM1_Set_Duty(128);           // 50% duty cycle
    
    // simple test program - 500 Hz modulation on 38kHz carrier
    while(1){                     // loop forever
        PWM1_Start();             // 38kHz turned on
        Delay_ms(1);
        PWM1_stop();              // 38kHz turned off
        Delay_ms(1);
    }
}

 

[Kripton2035]

tolerance , i couldn't understand it , could you please explain it?

must the signal generated be 38.0000000 kHz
or a 38.1KHz or 38.5kHz or 37.8kHz will work for your project ?

 

[rado]

yes Krypton ,i need a 38khz signal to operate the IR led as per data.

And also thanks Hexreader, I will try this code and reply.