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Low Pin Count Demo Board User’s Guide
Lesson 11 adds a Moving Average Filter to the Analog-to-Digital code in Lesson 4.
Twisting the potentiometer changes the value read by the Analog-to-Digital. The filtered
value is then sent to the LED display. The filter only runs every 0.2 seconds to slow
down the display changes and make it visible. The display appears to count from the
old potentiometer position to the new position.
The filter averages the last 8 readings. Choosing a power of two for the number of
samples allows division by simple rotates instead of longhand.
Rather than summing the array every time, it’s faster to keep a running sum, then
subtract out the oldest value in the queue and adding in the new value.
DS51556A-page 32
? 2005 Microchip Technology Inc.
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