122-28029 Parallax Inc, 122-28029 Datasheet - Page 259
122-28029
Manufacturer Part Number
122-28029
Description
GUIDE STUDENT SMART SENSORS
Manufacturer
Parallax Inc
Datasheet
1.122-28029.pdf
(340 pages)
Specifications of 122-28029
Accessory Type
Manual
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Smart Sensors
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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Your Turn - What Makes a High Ollie?
It would be interesting to datalog and compare different skaters' ollies. The best way to
do it would be to take video of each ollie, and then watch the video and examine the
graph at the same time. Another thing that can be measured is the time in the air, which
is the time between steps a and f in the graphs.
ACTIVITY #7: BICYCLE DISTANCE
Figure 6-18 on the next page shows how the board and accelerometer can be mounted
inside a bicycle wheel, in order to measure bicycle distance. As the bicycle is upright,
this might at first seem like an angle of rotation problem, like in Chapter 3, Activity #5.
However, there is also acceleration toward the center of the wheel that the axes will
measure. This is because the accelerometer is traveling in a circular path, just like the RC
car from the previous activity. This acceleration toward the center of the wheel will be
different at different speeds, and will result in skewed angle measurements.
accelerometer measurements will also be affected when the bike rider applies the brakes,
speeds up, and leans into turns. In addition, what criteria should be used to add one to the
number of full circles the bike wheel has turned? This activity introduces hysteresis as a
way of measuring wheel rotation. It also demonstrates how the datalogging techniques
used in earlier activities can be used to examine each of these issues and test for
prototype reliability.
NEXT
DEBUG CR, "Press Enter for menu..."
DEBUGIN char
RETURN
Do not let the metal on the underside of your board come into contact with the
spokes. Use an insulating material such as plastic, cardboard, or esd foam to insulate the
underside of the board from the spokes.
Chapter 6: Accelerometer Projects · Page 247
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