28119 Parallax Inc, 28119 Datasheet - Page 33

• Manufacturer Part Number: 28119
• Description: KIT UNDERSTANDING SIGNALS
• Manufacturer: Parallax Inc

Specifications of 28119

• Lead Free Status: Contains lead
• Accessory Type: Oscilloscope
• Interface Type: USB
• For Use With/related Products: BASIC Stamp® 2 and Board of Education
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

ACTIVITY #1: MEASURING PULSES FOR SERVO CONTROL
In this activity we will create and measure servo pulses using the OPTAscope’s Paired
Bars cursors function
Parts Required
(1) Standard Parallax servo
(1) 3-pin male/male header
(1) 220 Ω resistor (for the Board of Education Revs B and C)
(5) Jumper wires
Building the Servo Measurement Circuit
The circuits used in this chapter are built the same for the Board of Education Revisions
B and C, but differently for the HomeWork Board. Schematics and wiring diagrams for
both are included below.
Follow these directions for the Board of Education Rev. B and C:
√
√
√
P14
Insert the 3-pin male-male header into the servo lead. This will allow you to
connect the servo directly to the breadboard.
Build the circuit as shown in Figure 2-2 Figure 2-3:
Connect the OPTAscope CH1 probe to P14 and the GND probe to Vss as shown
in Figure 2-3:
Vdd
Vss
220
Ω
White
Red
Black
OPTA
OPTA
scope
scope
CH1
GND
Servo
Figure 2-2:
Servo control
schematic for the
Board of Education
Revisions B and C