Program for controlling analog servo motor using PIC18F452

[SolaiKannan]

i have bought a new analog servo motor and i need to program it using microcode studio using pic 18f452.

can anyone provide me a simple program to control the servo

 

[shaiko]

Re: Analog servo control

It doesn't matter if the servo is analog or digital.
The only signal that may vary is the PWM frequency.
To make it turn, you should supply pulses of ~50Hz with a pulse width from 1 to 2 milliseconds.
The pulse width controls the angle - 1.5ms is center.

 

[SolaiKannan]

Re: Analog servo control

this is my coding and i was not able to control the motor well.

define osc 20

OUTPUT PORTB.0 

LOOP:
    
    PULSOUT 0,110
    PAUSE 1000
    
    PULSOUT 0,120
    PAUSE 1000
    
    
    PULSOUT 0,130
    PAUSE 1000
    
    PULSOUT 0,140
    PAUSE 1000
    
    PULSOUT 0,150
    PAUSE 1000
    
    PULSOUT 0,160
    PAUSE 1000
    
     PULSOUT 0,170
    PAUSE 1000
    
     PULSOUT 0,180
    PAUSE 1000
                  
     PULSOUT 0,190    
    PAUSE 1000
    
    
     PULSOUT 0,200
     PAUSE 1000
    GOTO LOOP
END

Use CODE Tags (# Button) when posting your code.

 

[bigdogguru]

I am unfamiliar with Microcode Studio and its language syntax.

However if the PULSOUT statement generates a single pulse, this is the issue.

The PWM wave must be constantly repeated for the servo to maintain a position.

Try repeatedly generating a particular pulse for a few seconds, before changing the duty cycle and moving the servo to a new position.

BigDog