28029 Parallax Inc, 28029 Datasheet - Page 73

• 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

SUMMARY
The BASIC Stamp requests a measurement from the Ping))) sensor by sending it a brief
pulse, which causes it to emit a 40 kHz chirp. Then, the Ping))) listens for an echo of that
chirp. It reports the echo by sending a pulse back to the BASIC Stamp that is equal to the
time it took for the Ping))) sensor to receive the echo.
To calculate the distance based on the echo time measurement, the speed of sound must
be converted into units that are convenient for the BASIC Stamp.
converting meters per second to centimeters per
resulting value also has to be converted to a value that can be used with the multiply high
(
The speed of sound in air is c
changes with temperature, the resulting measurement errors are small, especially at room
temperature.
Questions
**
1. What is the Ping))) sensor's range?
2. What does ultrasonic mean?
3. What signal does the Ping))) sensor send the BASIC Stamp and how does it
4. What three sensor-object orientation scenarios could cause the Ping))) sensor to
5. What time increments does the
6. What's the speed of sound in air at room temperature?
7. How does
8. What do you have to do to the jumper between the X4 and X5 servo headers on
9. What commands have to be modified if you want to make the Parallax LCD
10. What role does air temperature play in the speed of sound in air?
) operator by multiplying it by 65536.
correspond to a distance measurement?
return an incorrect distance measurement?
the Board of Education to provide the correct supply voltage to devices like the
Ping))) sensor and the Parallax Serial LCD? What might happen if this jumper is
not correctly set?
display what the Debug Terminal was displaying?
CmConstant
air
relate to the speed of sound in air?
= 331.5 + (0.6 × T
PULSIN
Chapter 2: The Ping))) Ultrasonic Sensor · Page 61
command return when using a BS2?
PULSIN
C
) m/s. While the speed of sound
measurement units.
This involves
The