122-28029 Parallax Inc, 122-28029 Datasheet - Page 61

• Manufacturer Part Number: 122-28029
• Description: GUIDE STUDENT SMART SENSORS
• Manufacturer: Parallax Inc

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

Figure 2-6: Calipers with a mm/in Toggle Button
ACTIVITY #3: INCH MEASUREMENTS
Most electronic distance measuring devices offer results in either metric or English units.
For example, the calipers shown in Figure 2-6 has a button you can press to choose
between mm and inches. Other measuring devices offer yards or meters, or inches or
centimeters, etc. So that your program can display both centimeters and inches, this
activity introduces uses the multiply-high (
centimeters to inches.
An Inches ** Constant
The
speed of sound in centimeters per
every inch. So, the conversion formula from centimeter to inch distances can be written
like this:
The easiest way to convert to inches is to simply divide the value of
2.54, and use the result declared in another constant, like
constants for the
CmConstant
S
InCons
in
=
S
cm
tan
**
÷
used in
operator should be integers, so round the result to the nearest integer.
t
2.54
=
2260
cmDistance = time ** CmConstant
÷
2.54
PULSOUT
=
889.76
**
Chapter 2: The Ping))) Ultrasonic Sensor · Page 49
time unit. There are 2.54 centimeters in
) operator a second time to convert from
≈
890
InConstant
is a measure of the
. Remember that
CmConstant
by