SDBC-DK3UG Datasheet, PDF (20/76 Pages) Silicon Laboratories – 4 buttons and 4 LEDs for custom purposes

SDBC-DK3 UG
Figure 23. White LED Control
This feature is only manually enabled since the brightness of the LED may be distracting when on desk operation
is being implemented.
7.1.8. Running the Demonstration
Longer tests provide better averages, but in the interest of time, this demonstration sends only 1000 packets.
Users that modify the code can send as many or as few packets as they wish. The fact only 1000 packets are sent
can cause higher PER percentages since most of the dropped packets will occur while the user is setting up the
demonstration because he himself will absorb much of the radiation and add to multipath and fading effects. As
users become more familiar with radio it is highly recommended a greater number of packets be sent such that a
better average can be generated.
To run the demonstration, place one SDB in a fixed location. (If testing an antenna diversity system, place the
antenna diversity unit in the fixed location while using a single-ended testcard as the roaming testcard). The SDB
kept in the fixed location should be considered the “base unit”. This unit will act as the base unit. On the mobile
unit, the unit with the split TX and RX, press 'TX ON' and walk away from the base unit until the PER settles around
5-7%. When the PER has settled and all 1000 packets are sent press the CLEAR button and run the test again but
avoid being to close to the demo during the second test. If the test completes with 0-2% PER then the test should
be run again with a greater range, if 4–6% then run again but with a lower range. Once you reliably get 2-3% at the
end of the series of tests then, in that environment this can be considered the typical range in an application with
limited error handling - as is the purpose of this experiment.
Good protocols and handling of dropped packets enable users to get much greater ranges.
During early experimentation, users may notice that the LCD and LEDs show information that represents antenna
strength.
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