28029 Parallax Inc, 28029 Datasheet - Page 249
28029
Manufacturer Part Number
28029
Description
KIT PARTS SMART SENSORS W/TEXT
Manufacturer
Parallax Inc
Datasheet
1.122-28029.pdf
(340 pages)
Specifications of 28029
Accessory Type
Parts Kit
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
BASIC Stamp® or Javelin Modules
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
Other names
28029PAR
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1.4 g for a little over 2 seconds. Then it rested for about 1 second. After that, it
accelerated backward, and then decelerated (accelerated forward) to a second stop.
Figure 6-10: Acceleration Graph Modified with Positive Acceleration Indicating Forward
A column with an equation was added to the spreadsheet that calculates the change in
velocity for each acceleration measurement. The equation for velocity in a straight line is
v = v0 + at. That's the initial velocity (v0) plus the product of the acceleration (a) and the
duration of that acceleration (t). Adding a column to the spreadsheet that recalculates
velocity between each acceleration measurement makes it possible to graph the velocity
as shown in Figure 6-11. As expected, when the car accelerates forward, its velocity
increases. Then, when it slows down, its velocity decreases. As it accelerates backward,
its velocity decreases further (increases in the negative direction). Then, as it slows its
backward motion, its velocity returns to almost zero.
Selecting Data to Graph. Right-click the line in the plot with the title "RC Car Acceleration
for Forward and Backward.” Then choose source data and click the Series tab. Note that
the series being plotted is from F229 to F492. This is the second of two forward/backward
tests that were performed during the datalogging session. The same applies to the Velocity
and Position graphs.
Chapter 6: Accelerometer Projects · Page 237
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