MicroTouch Micro Touch Capacitive Controller MT3000, Reference Manual, Page: 37 / 64

Chapter 2 Communicating with the MT3000 Controller 37
Note: The example in this discussion is in video terms, with the
origin (0, 0) in the upper left corner of the screen. Examples from the
controller’s perspective, however, place the origin at the lower left corner
of the screen.
You can adjust the default calibration points using the Set Parameter Block
command. For more information, contact MicroTouch Technical Support.
Guidelines for Calibrate Extended
Here are several guidelines for using the Calibrate Extended command:
•
The controller uses the data immediately before liftoff to register a
calibration touch. Therefore, users can touch the screen, move their
finger to the target, hold for one second, and then lift off their finger.
Instructing users to touch this way results in a more accurate
calibration.
Upper Right Calibration Target
X = 1023 – (1024 x 1/8) = 1023 – 128 = 895
Y = 0 + (768 x 1/8) = 0 + 96 = 96
(0, 0)
(0, 767)
(
1023, 0)
(80, 60)
(560, 420)
Lower Left Calibration Target
X = 0 + (1024 x 1/8) = 0 + 128 = 128
Y = 767 - (768 x 1/8) = 767 - 96 = 671
(128, 671)
(895, 96)