28029 Parallax Inc, 28029 Datasheet - Page 244
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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Page 232 · Smart Sensors and Applications
measurements were acquired with DatalogAcceleration.bs2 from Activity #4. After
displaying them in the Debug Terminal, they were shaded, copied and pasted into
Windows Notepad. From there, they were imported into the Microsoft Excel spreadsheet
program and then graphed.
The reason the forward acceleration is negative is because the y
to the back of the RC car as shown in Figure 6-6. So, as the car is accelerating forward,
the acceleration is negative.
backwards. This is shown in Figure 6-5. First, the car accelerated forward, then it
applied the brakes and slowed down (decelerated). The y measurement was positive, so
acceleration was negative. After a brief stop, the car accelerated backwards. Notice that
the y is again positive. Then, when it slows down (decelerates) from its backwards speed
to stop again, the car is, in effect, accelerating forward, and the y measurement is
negative again.
Decelerate
-10
-20
-30
-40
30
20
10
Accelerate
0
Forward
0
50
RC Car Forw ard and Backw ard
100
Stop
seconds/30
150
Decelerate
200
Accelerate
Backward
When a car slows down, it is actually accelerating
250
300
Figure 6-5
RC Car Accelerometer Y-
Axis Measurements
m
sensing axis is pointing
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