28029 Parallax Inc, 28029 Datasheet - Page 188

• 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 176 · Smart Sensors and Applications
When designing a display to show Cartesian coordinates, it helps to take a couple of
before and after values like the ones in Table 5-1. You can then use them to solve for
scale (K) and offset (C) using two equations with two unknowns.
The usual steps for two equations in two unknowns are:
(1) Substitute your two before and after data points into separate copies of the equation.
12
2
X
after
=
=
(
K
(
K
×
=
×
−
(
K
3
2
×
)
)
+
X
+
before
C
C
)
+
C
Figure 5-5
Test Coordinates