Datasheet

Chapter 2 • Shield, Lights, Servo Motors
64 • Robotics with the BOE Shield-Bot
Tool Required
You’ll need a Phillips #1 point screwdriver with a 1/8″ (3.18 mm) or smaller shaft.
Sending the Center Signals
If a servo has not yet been centered, it may turn, vibrate, or make a humming noise when it
receives the “stay-still” signal.
 Reconnect your programming cable, and re-load Example Sketch:
LeftServoStayStill from page 58.
 Set the BOE Shield’s Power switch to 2, to provide power to the servos.
 Use a screwdriver to gently
adjust the potentiometer in the servo as shown
below. Don’t push too hard! Adjust the potentiometer slightly until you find the
setting that makes the servo stop turning, humming or vibrating.
Insert tip of
screwdriver into
potentiometer
access hole,
…then twist
potentiometer until
the servo is
completely still.
 Verify that the pin 13 LED signal monitor circuit is showing activity. It should
glow like it did when you ran LeftServoStayStill the first time.
What’s a Potentiometer? It is kind of like an adjustable resistor with a moving part, such as a
knob or a sliding bar, for setting the resistance. The Parallax continuous rotation servo’s
potentiometer is a recessed knob that can be adjusted with a small Phillips screwdriver tip.
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