28029 Parallax Inc, 28029 Datasheet - Page 72

• Manufacturer Part Number: 28029
• Description: KIT PARTS SMART SENSORS W/TEXT
• Manufacturer: Parallax Inc

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

Page 60 · Smart Sensors and Applications
move the object half a centimeter beyond 100 cm before it would transition from 99 to
100 cm.
Your Turn - Room Temperature Vs. Freezing
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√
√
√
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√
Calculate the percent measurement error that would result from assuming that
the ambient temperature is freezing (32 °F, 0 °C), but it's actually room
temperature (72 °F, 22.2 °C).
How far off would the measurement be if the object is 1 m away?
Use the procedure introduced in Activity #2 to calculate the speed of sound and
CmConstant
Save PingMeasureCm.bs2 as PingMeasureCmYourTurn.bs2
Run the program before modifying it and test the distance measurement of an
object at 1 m.
Modify the
Re-test the program with an object at 1 m. How close is your predicted error to
the actual error?
%
error
=
=
0.49%
346.5
cmConstant CON
for measurements at 0 °C.
344.8
-
344.8
×
directive with the value for 0 °C.
100%