Problem with PropBot

MacGeek117

I just got my first Propeller in the form of a Protoboard that I just put on my BoeBot chassis. I've posted the program I'm using to test the servos, but only the servo I set first runs. The other one stays still. Does anyone know what I'm doing wrong?
RoboGeek


PS. Yes, the connections are good, I already tested them.

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Post Edited (RoboGeek) : 3/6/2007 5:34:04 PM GMT

Stan671

According to the Servo32_demo, you seem to need to issue one Servo.Set for each servo you will be using BEFORE running Servo.Start. Otherwise, the pin direction settings get out of sync.

'Preset Servo's you want to use to center position 
 
SERVO.Set(PanServo1,1500) 
SERVO.Set(PanServo2,1500) 
SERVO.Set(PanServo3,1500) 
SERVO.Set(PanServo4,1500) 

'Note: Servo pins that will be used must be preset before running "SERVO.Start". 
' This is because the I/O direction is set here and is only executed 
' at the beginning of "SERVO.Start". Servo pins that aren't used will remain 
' in their original direction state. 

 
SERVO.Start 'Start Servo handler

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Stan Dobrowski

Beau Schwabe

RoboGeek,

Stan671 is correct... another reason for doing this is so the servo's have some sort of pre-defined position. Doing so otherwise may yield unpredictable behavior.

Try something like this...

''***************************
''* Propeller Template V1.0 *
''*  Author: Peter Quello   *
''*  Started: 18 JUN 2006   *
''***************************

[b]CON[/b]
    [b]_clkmode[/b]      = [b]xtal[/b]1 + [b]pll[/b]16x
    [b]_xinfreq[/b]      = 5_000_000
    left          = 25
    right         = 24                        
[b]VAR[/b]
  
[b]OBJ[/b]
    servo :       "servo32"
[b]PUB[/b] Start
    servo.set(right, 1300)
    servo.set(left, 1700)

    servo.start

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Beau Schwabe

IC Layout Engineer
Parallax, Inc.

Post Edited (Beau Schwabe (Parallax)) : 3/6/2007 8:17:28 PM GMT

MacGeek117

Thank you for the help! IT WORKS!
RoboGeek

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
"I reject your reality and subsitute my own!"

Adam Savage, Mythbusters
www.parallax.com
www.goldmine-elec.com
www.expresspcb.com
www.startrek.com
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