National Instruments NI myRIO, Essentials Manual

Page: 67 / 163

CHAPTER 8. COIN COUNTER 61
Digilent PmodCLS LCD Display
Chapters 26 to 28 of the NI myRIO Project Essentials Guide
6
provide a detailed
explanation of the Digilent PmodCLS LCD display using its UART, SPI, or I
2
C-
bus interface as well as LabVIEW demonstration code available at NI myRIO
Project Essentials Guide .zip Files
7
that you can drop into this project. Study
LCD Character Display Interfacing Theory
8
to learn how to write escape se-
quences to configure and control the LCD display and then study one of these
block diagram “walk-through” videos depending on the serial bus that you wish
to use:
LCD (UART) Demo Walk-Through
9
, LCD (SPI) Demo Walk-Through
10
,
or LCD (I2C) Demo Walk-Through
11
.
T
IP
: Refer to the NI myRIO connector diagrams in Appendix B on
page 137.
LabVIEW Techniques
The following LabVIEW techniques are required for this project:
•
Get ROI from Image Display
12
– Get the ROI (region of interest) from the
main image display with a “Property Node.”
•
Add Custom Data Lane
13
– Create a custom control for the “Circles Data”
Vision Assistant script output and insert this into the data highway
• Create Formatted Text String
14
– Create a formatted text string with the
“Format Into String” VI. The syntax is similar to the “printf” function in C.
•
Overlay Text at X-Y Coordinates
15
– Programmatically place overlay text
at a specific X-Y location.
6
http://www.ni.com/myrio/project-guide
7
http://www.ni.com/academic/myrio/project-guide-vis.zip
8
http://youtu.be/m0Td7KbhvdI
(10:36)
9
http://youtu.be/JsEMMnIWg4k
(3:44)
10
http://youtu.be/oOXYryu4Y-c
(4:23)
11
http://youtu.be/qbD31AeqOMk
(4:32)
12
http://youtu.be/sKeO2iM8UWE
(2:29)
13
http://youtu.be/GkqjZCj3xck
(2:58)
14
http://youtu.be/VqH0SSK1fHY
(1:44)
15
http://youtu.be/O5IIrPP_smA
(1:41)