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delay generation

mr.rohit

Delay generation using timer in pic18f46k22

 

I am using timer interrupt for delay generation in pic18f

when i generate  any delay using timer that time this delay is not proper which i want,it showing some difference in time.

i want knw what is the reason of that difference ?

plz help me...

thank u..

Parents Reply
  • in reply to COMPACT

    hello..

    I am working with capacitive touch sensor with pic18f microcontroller using CTMU.

    i want to toggle the LED with capacitive touch sensor..means  when i touch the sensor that time i want  LED in ON State till the next touch,when i again touch the sensor that time i want LED in OFF state till next touch...

    for toggling this LED i used following syntax..ie

    LATDbits.LATD1 = ~ LATDbits.LATD1 ;

    LATDbits.LATD1 = ! LATDbits.LATD1;

    and also

    LATDbits.LATD1 = 1

    LATDbits.LATD1 = 0

    but using all above methodes LED is turning ON when i touch the sensor,and turning OFF when i release touch sensor..

    i dont know which methode is use for this operation...

    what should i do for this operation ?

    plz help me...

    thank u......image

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  • in reply to mr.rohit

    Hello,

    Please create a separate discussion (or question) for each separate issue you have. There is less chance it will be lost in a discussion with different topic and higher possibility that someone will notice and help.

     

    To the subject:

    First, you haven't provided any schematics, so make sure you know how is the LED connected to a PIC pin and whether it sources or sinks the current for your LED.

    Second, according to what you wrote, I don't think you have problem with the code toggling an LED itself, but somewhere else in the code, handling / responding to the detection of a touch. Helping would be easier if we could actually look at the code.

     

    what you probably have in pseudocode:

         if touch_detected > turn LED on

              else turn LED off

     

    what you need:

         if touch_detected > toggle LED