Simple Servo Position Control Program - Is this right?


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  1. #1
    Join Date
    Oct 2010
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    Northern Colorado
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    Default Simple Servo Position Control Program - Is this right?

    I have a pretty simple process that I need carried out via a 16F88 and a servo.

    I have an arm that has a heating element on the tip of it. I need this heating element to be lowered onto a bed of grass for one second, then lifted out of the grass. I am testing the flammability of grass within a climate controlled wind tunnel. I want this to be triggered from a simple push of a NO button, then have it carry out the whole process from there. Problem is that I have not messed with a servo motor before and I am not sure if I am controlled it in the correct way. The button is on A0 and the servo control output would be on A1. What I have for code is

    Code:
    'Set internal clock settings for 16F88
    Define OSC 8
    OSCCON.4=1
    OSCCON.5=1
    OSCCON.6=1
    
    'Turn off A/D conversion
    ANSEL=0
    
    
    'Define variables and pins
    I	        VAR 	BYTE
    BUTTON		VAR	PORTA.0
    SERVO		VAR	PORTA.1
    
    'Continuous loop until triggered by ignition button
    buttonloop:
    
    If (BUTTON=0) Then goto buttonloop
    	Pause 10
    
    If (BUTTON=1) Then goto positionloop
    
    goto button loop
    
    'Servo position control loop
    positionloop:
    
    Pulsout PORTA.1, 100		'pulse to servo for a length of 1 ms to rotate servo CCW certain number of degrees
    For I=1 TO 100			'pulse to servo every 10 ms for a total of 1 second
    	Pause 1000
    NEXT
    
    Pulsout PORTA.1, 150		'pulse to servo for a length of 1.5 ms to move to "zeroed" position
    
    goto buttonloop
    
    End 				'end of program never reached
    Is this the correct way of doing it? Any help/suggestions would be great!

    -Marcus
    Last edited by marcusvm; - 22nd December 2010 at 19:41.

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