Chapter 2: Your Boe-Bot’s Servo Motors · Page 69
' P12 for manual centering.
' {$STAMP BS2}
' {$PBASIC 2.5}
DEBUG "Program Running!"
DO
PULSOUT 12, 750
PAUSE 20
LOOP
If the servo has not yet been centered, its horn will start turning, and you will be able to
hear the motor inside making a whining noise.
√ If the servo is not yet centered, use a screwdriver to gently adjust the
potentiometer in the servo as shown in Figure 2-24. Adjust the potentiometer
until you find the setting that makes the servo stop turning.
Caution: do not push too hard with the screwdriver! The potentiometer inside the servo
is pretty delicate, so be careful not to apply any more pressure than necessary when
adjusting the servo.
Figure 2-24
Center Adjusting a
Servo
√ Verify that the LED signal monitor circuit connected to P12 is showing activity.
It should be emitting light, indicating that the pulses are being transmitted to the
servo connected to P12.
If the servo has already been centered, it will not turn. It is unlikely, but a damaged or
defective servo would also not turn. Activity #6 will rule out this possibility before the
servos are installed on your Boe-Bot chassis.
Insert tip of Phillips screwdriver
into potentiometer access hole.
Gently turn screwdriver to
adjust potentiometer
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