28029 Parallax Inc, 28029 Datasheet - Page 60

• 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 48 · Smart Sensors and Applications
Example Program: PingMeasureCm.bs2
' Smart Sensors and Applications - PingMeasureCm.bs2
' Measure distance with Ping))) sensor and display in centimeters.
' {$STAMP BS2}
' {$PBASIC 2.5}
' Conversion constants for room temperature measurements.
CmConstant
cmDistance
time
DO
LOOP
Your Turn - Verifying the Calculations
Let's verify that that the program is correctly calculating the distance.
PULSOUT 15, 5
PULSIN 15, 1, time
cmDistance = CmConstant ** time
DEBUG HOME, DEC3 cmDistance, " cm"
PAUSE 100
√
√
√
√
√
√
S
object-
Enter, save and run PingMeasureCm.bs2.
Move the target object until the measurement displays 20 cm.
Align your ruler with that measurement.
somewhere with the Ping))) sensor, typically somewhere between the printed
circuit board and the front-most part of the speaker/microphone.
Now, experiment with other distance measurements.
Modify PingMeasureCm.bs2 so that it displays the values of both the time and
the distance variables.
Use a calculator to verify that you get the same result from the distance equation
that you do from the program.
cm
CON
VAR
VAR
=
0.03448
2260
Word
Word
×
t
PULSIN
-
BS2
The 0 cm mark should align