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App2: Input Application
Provide a program that reads the state of digital lines connected to the U401⁄U421⁄U451.
This program initializes all of the sixteen i⁄o lines of the U4x1 to be inputs that can then be read by the PC.
The state of individual lines are displayed on the bottom of the application window. A bright red color indicates that the line is set high, while a dark red color shows that the line is set low.
Below is the application screen as it looks when the program is first initialized. Both ports (all of the lines) have been set to be inputs. When new values are read from the ports, the individual boxes (for each line) will change from gray to either bright or dark red.
No specific hardware is necessary to run this application. The individual input lines can be connected to either high (+5V) or low (ground).
An interface board such as the DT203 SimmStick can be attached to the U4x1 and read by this application.
Example of a single switch input to the U4x1 (10k ohm resistor would work fine):
Example of an opto-isolated input:
Download all application files: (all application files)
|Hardware: U401 USB Interface U421 USB Interface U451 USB Interface|
Programming: USBm DLL Programming Download Files
Application Notes: U4x1 Application Notes Misc Applications and Information FAQ
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