28029 Parallax Inc, 28029 Datasheet - Page 223

• 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

Chapter 6: Accelerometer Projects · Page 211
Chapter 6: More Accelerometer Projects
There are three types of projects in this chapter. The first type is a direct application of
hardware and programs that were used in earlier chapters. The second type requires
datalogging of the acceleration measurements, and so several activities are devoted to a
datalogging program. The third type requires datalogging to figure out what kind of
measurements the accelerometer will report. Then, based on the datalogging results, you
will have enough information to write a program to make the device work reliably.
ACTIVITY #1: MEASURE HEIGHTS OF BUILDINGS, TREES, ETC.
Climbing to the top of an object to measure its height is not always convenient, practical,
or even safe. This activity introduces a novel way to use some of the accelerometer
measurements developed in Chapter 3 to make height measurements from a safe vantage
point on the ground.
Sighting the Top and Determining Height
Figure 6-1 shows a scheme for measuring the height of an object, using the accelerometer
and LCD display as an angle-sight. First, sight the top of the object with the edge of your
board, and record the measured angle. Then, measure the distance between the spot you
took your measurement and the object, which is the adjacent side shown in Figure 6-1.
The adjacent distance, the angle θ, and the height of the accelerometer above the ground
are the three key pieces of information you need to calculate the object height.
Figure 6-1: Determining Height with Line-of-Sight