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Recent content by viccram

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    My PIC program hangs probably because of memory issues

    my program hangs.... it is compiled and built successfully showing 44.45% program memory usage i am programming in C...should i consider page or compiler does it??? what is the stack limitation of PIC16F877a??? is calling a function in another function creating this problem??? i hav heard that...
  2. V

    motion control in a curve path

    i am trying to move my robot in a curve path.... i am using incremental encoder having 96 pulse per revolution and microcontroller PIC16F877a and a XTAL of 11.0592Mhz. how do i make this possible... i am trying to control two wheels simulatneosly...ie i hav given then required pulse per...
  3. V

    i am having problem with RB6 pin in PIC16F877a

    is it possible to use suppressor diodes if the motor runs in both directions??? can any one give suggestion on how to remove noise on two circuits.... i hav an interfacing ciruit on a cardboard on the back side i hav motor driver circuit...is this due to interference... The i hav designed the...
  4. V

    i am having problem with RB6 pin in PIC16F877a

    on changing the pin the problem still persists on the same pin.... i changed the switch to another motor i/p but the robot goes wild when i i press the switch corresponding to same RB6 pin and if i shift to RB0...this problem is in pin RB0 as well...both pins are going crazy the problem is...
  5. V

    i am having problem with RB6 pin in PIC16F877a

    thats not noise problem i hav tested it and also reduced the noise in motors but the as soon as the pin goes low the PIC doesnt work i am using hi-tech PIC C compiler.... do u hav any idea wat happens when my program becomes bigger my program is a little large one and i hav not considered the...
  6. V

    i am having problem with RB6 pin in PIC16F877a

    ya Mr Carnal.... is this PIC manufacturing fault or what? does any one hav any better solution to it....? changing PIC did not work for me and neither do i hav a xtra i/p pin on my system... My system goes MAD and i am going crazy with this problem...
  7. V

    i am having problem with RB6 pin in PIC16F877a

    its just a simple ckt... i am using this pin as a i/p from limit switch in my robot... on pressing the switch the motor is supposed to stop but the motor does not stop sometimes (eg. the case is once in every 10 times) so i think its not a basic circuit problem....is it because of spikes in...
  8. V

    i am having problem with RB6 pin in PIC16F877a

    pic16f877a pin 39 i am using pin no. 39 (RB6) as an input pin using and enabled interrupt on change feature. while using other three pins(RB4-RB7 exvept RB6) as input the system has no problem...but when i use this pin as input the system doesnt always work properly..... the input is a pulled...
  9. V

    i am having linetracking problem

    hie... i used the proportional algorithm in linetracking. i used six lineracking sensors (phototransistors) and modified the algorithm as required. the problem i faced was when the distance between the sensors and wheel was 30cm the algorithm works fine but when i had to use the same...
  10. V

    how do i use 8bit lcd (jhd162a) in 4 bit mode using AT89s52

    jhd162a but i dont have the programming manual neither do i hav the datasheet of the lcd module in english even though i searched it from the net but it did not work when i tried coding using the instructions given
  11. V

    how do i use 8bit lcd (jhd162a) in 4 bit mode using AT89s52

    lcd jhd162a how do i use 8bit lcd (jhd162a) in 4 bit mode using AT89s52 i have been using 8bit lcd in normal 8bot mode but i am not getting the idea how to select 4 bit mode and also not clear what else should i do to use in 4bit mode
  12. V

    generating pwm in a dedicated AT89S52 microcontroller

    pwm with timer at89s52 i used those pins just for my convienience nothing specific reason about that.... but when i use port other than P3 the pwm doesnt come even in KEIL simulation(using its logic analyzer)
  13. V

    generating pwm in a dedicated AT89S52 microcontroller

    pwm and 89s52 could any one tell me how did you generate PWM using AT89s52 here is my sample prgram to generate pwm in two pins of a microcontroller //***********viccram attempt on PWM using AT89s52 in KEIL #include<regx52.h> int pdata address_high= 0x1900; //this is a program(code)...
  14. V

    generating pwm in a dedicated AT89S52 microcontroller

    at89s52 microcontroller i am trying to generate two pwm signals in a at89s52 microcontroller. i tried using timers interrupt and the program runs well in KEIL simulation and has problems while simulating in proteus as well as in bread board.. could anyone explain me what are the possible...
  15. V

    how do i control DC motor speed using dac and pwm

    pwm to dc with dac i am an engineering student and trying to make a robot.i have used motors to move the robot but want to vary the speed according to the need.

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