midyfying servos - cant get the pot head to stop rotating

[rox2007]

Ok i followed the instructions in the modifying servos tutorial but i cant get the part where you stop the gears by moving the pothead.
I keep turning it left and right but it doesnt work.
Please help

[airman00]

move it slowly and make sure you are giving it the right pulse at the corerct oscillator setting

[rox2007]

what exactly is the right pulse and oscillator setting for an atmega 168. i am passing 1.5ms on the internal 8Mhz clock

[rox2007]

i turn and turn and turn. The speed just get's slower or faster. it goes from one extreme to another. fast to slow...slow to fast....theres no midpoint where it just stops

[airman00]

turn it very slowly and carefully


also try to give it 1.5ms @ 4mhz


what is your code ?

[rox2007]

#include <avr/io.h>

//Define functions
//======================
void ioinit(void);      //Initializes IO
void delay_ms(uint16_t x); //General purpose delay
void delay_cycles(unsigned long int cycles);
//======================

int main (void)
{
    ioinit(); //Setup IO pins and defaults

    while(1)
    {
      PORTC = 0xFF;
      PORTB = 0xFF;
      PORTD = 0xFF;
      delay_cycles(35);

      PORTC = 0x00;
      PORTB = 0x00;
      PORTD = 0x00;
      delay_cycles(35);

      //delay_cycles(500);
    }
   
    return(0);
}

void ioinit (void)
{
    //1 = output, 0 = input
    DDRB = 0b11111111; //All outputs
    DDRC = 0b11111111; //All outputs
    DDRD = 0b11111110; //PORTD (RX on PD0)
}
//************DELAY FUNCTIONS************
//wait for X amount of cycles (23 cycles is about .992 milliseconds)
//to calculate: 23/.992*(time in milliseconds) = number of cycles
void delay_cycles(unsigned long int cycles)
   {
   while(cycles > 0)
      cycles--;
   }
//***************************************

[rox2007]

that's my code. i was running at 8mhz and sending 1.5ms

[airman00]

which servo are you using?

[rox2007]

HS-311, the ones recommended by the tutorial

[rox2007]

I finally got it to work...Thanx alot

[ed1380]

just as i was about to post this
http://www.instructables.com/id/modify-the-hitec-hs-325-servo-for-continuous-rotat/

[Rebelgium]

Help people with the same problem, tell us what was the problem and how you fixed it.

[rox2007]

well, i sent a 1.5ms pulse and ran my atmega168 at 4 mhz...and i rotated the pot until the gears stopped

[airman00]

at what mhz?

[javafiend]

Since nothing else seems to be working, I used the OP's code but can't see where to change the frequency.  I'm using AVR Studio.

[garriwilson]

at what mhz?

well, i sent a 1.5ms pulse and ran my atmega168 at 4 mhz...and i rotated the pot until the gears stopped

 

[airman00]

at what mhz?

well, i sent a 1.5ms pulse and ran my atmega168 at 4 mhz...and i rotated the pot until the gears stopped

 

to garriwilson

the 4mhz was edited in his post AFTER I replied   

[rox2007]

i did, sorry about that

[garriwilson]

Oh my bad