28029 Parallax Inc, 28029 Datasheet - Page 95

• 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

ACTIVITY #4: SCALING TO 1/100 G
The standard measure of gravity on the earth's surface is abbreviated "g." This activity
demonstrates how to use the techniques introduced in the previous activity to display the
number of hundredths of a g acting on the accelerometer's x and y axes.
From PULSIN to 1/100 g
The goal here is to modify the example program from Activity #1 so that it displays the
x- and y-axis measurements in terms of 1/100 g instead of 2 µs units. It's another scaling
and offset problem, but this time, we want to fit the 1875 to 3125 input scale into an
output scale of −100 to 100 as shown in Figure 3-13.
√
√
√
Save TestScaleOffset.bs2 as TestScaleOffsetYourTurn.bs2.
Modify the program so that you can test Table 3-2 with the BASIC Stamp and
Debug Terminal.
Compare the Debug Terminal results to your table.
Value
10
0
1
2
3
4
5
6
7
8
9
Table 3-2:
**Scale Constant
x 0.2999 =
x 0.2999 =
x 0.2999 =
x 0.2999 =
x 0.2999 =
x 0.2999 =
x 0.2999 =
x 0.2999 =
x 0.2999 =
x 0.2999 =
x 0.2999 =
Measured voltages during charge cycle
Chapter 3: Tilt with the Memsic Accelerometer · Page 83
Calculates Value
0.2999
0.5998
0.8997
1.1996
0
Integer Result
BASIC Stamp
0
0
0
0
1