28119 Parallax Inc, 28119 Datasheet - Page 35
28119
Manufacturer Part Number
28119
Description
KIT UNDERSTANDING SIGNALS
Manufacturer
Parallax Inc
Datasheet
1.28119.pdf
(137 pages)
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
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Vss
Vin
P14
Servo brand does matter! This circuit was designed to use the Parallax servo included in
the Understanding Signals kit, which has a current draw of around 100 mA unloaded. If you
are using a different servo that may have a higher current draw or that will be under a load,
you may find that your BASIC Stamp resets due to brown-out conditions. This can be
remedied by connecting a 3300 µF capacitor (not included) across Vin and Vss.
CAUTION: be careful to observe the polarity of the capacitor! The positive terminal (longer
leg) must connect to Vin (power source), and the negative terminal (shorter leg) must
connect to Vss (ground). If you insert the capacitor incorrectly, it may explode. Always
disconnect the power source while building or modifying circuits. When working with a large
capacitor, keep your hands away from the capacitor after the power is reconnected.
Goggles are recommended.
White
Red
Black
OPTA
OPTA
scope
scope
CH1
GND
Servo
Figure 2-4:
Servo control schematic for
the HomeWork Board
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