28029 Parallax Inc, 28029 Datasheet - Page 250

• 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 238 · Smart Sensors and Applications
Figure 6-11: Velocity Graph Derived from Initial Position and Acceleration Data
The calculations for this plot are made in the spreadsheet's column-F. If you click cell F-
17 in the spreadsheet, this equation should appear in the function field:
In this case, F16 is the cell just above F17, and it has the previous velocity. This previous
velocity is used as V
9.8 * E17 / 100 takes the E17 measurement, which is in hundredths of a g and converts
it to meters per second (m/s
down to g and then multiplying by 9.8 converts from g to m/s
approximately 9.8 m/s
With columns in the spreadsheet for acceleration and velocity, it is now possible to also
keep track of the car's position using the equation s = s
position of the car (s) is equal to the initial position (s
and time (v
resulting graph of position shown in Figure 6-12 is surprisingly accurate. The car did in
fact go forward to about the 3.5 meter mark before stopping. Then, it backed up and
came to rest almost a meter behind where it started.
=F16 + (0.03*9.8*E17/100)
0
t), plus half the product of acceleration and the square of time (
0
2
for the sample interval. 0.03 is t, the time between samples, and
.
2
). Dividing by 100 takes the value from hundredths of a g
0
) plus the product of initial velocity
0
+ v
0
2
t +
. That's because 1 g is
1
/
2
at
2
. That is, the
1
/
2
at
2
). The