DM164120-1 Microchip Technology, DM164120-1 Datasheet - Page 36

• Manufacturer Part Number: DM164120-1
• Description: BOARD DEMO PICKIT 2 LP COUNT
• Manufacturer: Microchip Technology
• Type: MCUr

Specifications of DM164120-1

• Contents: 3 Boards (1 Populated, 2 Bare)
• Processor To Be Evaluated: PIC16F690
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC16
• Silicon Core Number: PIC16F
• Silicon Family Name: PIC16F6xxx
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: 28-pin PIC16C, 16F, 18C, 18F
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Low Pin Count Demo Board User’s Guide
DS51556A-page 32
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.
© 2005 Microchip Technology Inc.