DM163029 Microchip Technology, DM163029 Datasheet - Page 38

• Manufacturer Part Number: DM163029
• Description: BOARD PICDEM FOR MECHATRONICS
• Manufacturer: Microchip Technology

Specifications of DM163029

• Main Purpose: Power Management, Motor Control
• Embedded: *
• Utilized Ic / Part: *
• Primary Attributes: *
• Secondary Attributes: *
• Processor To Be Evaluated: PIC16F917
• Interface Type: RS-232
• Silicon Manufacturer: Microchip
• Silicon Core Number: DM163029
• Silicon Family Name: PICDEM
• Kit Contents: PICDEM Mechatronics Board, MCU Samples, Software And Cables
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PICDEM
DS51557C-page 34
TM
FIGURE 2-13:
Instructions
POT1 adjusts the speed of the motor. Set POT1 at 100% to run the motor at full speed.
The speed indicated on the LCD should be similar to the speed shown in Project 5.
Next, run the motor at half speed by setting POT1 to 50% and do the comparison again.
Discussion
Back EMF is typically not as accurate as speed feedback from an optical encoder.
However, in many applications the accuracy does not have to be very precise and
measuring Back EMF is more cost effective than any other speed feedback
mechanism.
Mechatronics Demo Board User’s Guide
10 kΩ
POT1
Back EMF
Note:
V
DD
Different motors have different speed characteristics. The motor used at the
time this manual was written may be different from the motor shipped with
your PICDEM Mechatronics Demo Board. Verify that the motor data sheet
included on the CD-ROM matches the motor on the board. If they are
different, go to Microchip’s web site for updates to this project.
1 kΩ
1 kΩ
R10
R32
PROJECT 6: SCHEMATIC
V
1000 pF
C26
C36
1000 pF
DD
11/32
12/31
2
7
AN0
V
AN4
V
DD
SS
PIC16F917
COM
CCP2
SEG
RD7
X
X
Simplified circuit shows
equivalent functionality
30
21
Segment pins
Common pins
VIM-332-DP
10 kΩ
10 kΩ
LCD1
© 2006 Microchip Technology Inc.
U11:B
U10:A
Motor
V
DD
Back EMF