122-28029 Parallax Inc, 122-28029 Datasheet - Page 71
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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distance calculations. Air temperature, on the other hand, can cause measurable distance
errors. The speed of sound increases by 0.6 meters per second (m/s) for every degree-
Celsius (°C) increase in temperature. Since the speed of sound is about 331.5 m/s at 0
°C, we can use this equation to calculate the speed of sound at a given temperature.
Below are examples for the speed of sound at two fairly comfortable, but slightly
different indoor temperatures.
Example 1: Calculate the speed of sound at 22.2 °C, which is approximately 72 degrees
Fahrenheit (°F).
Example 2: Calculate the speed of sound at 25 °C, which is 77 degrees Fahrenheit (°F).
How much of a difference does this make to your distance measurements? We can
calculate the percent error this will propagate with the percent error equation.
If the predicted temperature in the room is 72 °F (22.2 °C), and the actual temperature is
77 °F (25 °C), the error is 0.49 percent. Half a percent error would cause you to have to
C
C
C
%
air
air
air
Converting from °F to °C and Visa Versa
To convert a degree-Fahrenheit to Celsius, subtract 32 from T
measurement), then divide by 1.8. The result will be T
from Celsius to Fahrenheit, multiply T
error
(
=
(
22.2
25°C
331.5
=
°
)
actual
C
=
)
+
=
331.5
T
(
0.6
C
331.5
predicted
=
(T
-
×
F
predicted
+
-
T
32)
C
+
(
0.6
)
(
0.6
÷
m/s
1.8
×
25
×
22.2
×
)
C
100%
m/s
by 1.8, then add 32. The result will be T
m/s
Chapter 2: The Ping))) Ultrasonic Sensor · Page 59
=
T
F
)
346.5
= .
=
1
8
344.8
×
T
C
C
, the Celsius equivalent. To convert
m/s
+
32
m/s
F
(the Fahrenheit
F
.
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