Microchip Technology PICDEM Mechatronics Demo Board DM163029 DM163029 用户手册
产品代码
DM163029
PICDEM
TM
Mechatronics Demo Board User’s Guide
DS51557C-page 16
©
2006 Microchip Technology Inc.
1.8.6
SNAP-OFF SENSORS
The temperature sensor and light sensor can be snapped off to give greater flexibility
in using these sensors. For example, the temperature sensor may be snapped off and
moved into a more hostile environment, while keeping the board within sight. Once,
snapped off, solder wires of the same length between the adjoining holes (i.e., JP3 and
JP4 for the temperature sensor) on the PICDEM Mechatronics Demo Board and the
sensor board.
in using these sensors. For example, the temperature sensor may be snapped off and
moved into a more hostile environment, while keeping the board within sight. Once,
snapped off, solder wires of the same length between the adjoining holes (i.e., JP3 and
JP4 for the temperature sensor) on the PICDEM Mechatronics Demo Board and the
sensor board.
1.8.7
BACK EMF SCALING RESISTORS
If choosing to drive your own Brushed DC motor with the PICDEM Mechatronics Demo
Board at a voltage higher than +5 V
Board at a voltage higher than +5 V
DC
, the Back EMF must be scaled down into a range
of 0-5 V
DC
. Resistor locations, R55 and R56, are provided for this purpose. These
locations may be populated with resistors to create a simple voltage divider circuit. TP1
is the output of this voltage divider. See the schematic in Appendix A. “Hardware
Schematics” for further clarification.
is the output of this voltage divider. See the schematic in Appendix A. “Hardware
Schematics” for further clarification.
1.8.8
CURRENT SENSE
The output stage of the board incorporates a simple current sensing circuit, which is
assessable at J15 (CURRENT SENSE). At this pin, the voltage is equal to current
± 10%. For instance, if a motor is being driven and it is drawing 0.9 amps, the voltage
at the header is 0.9 volts (± 10%).
assessable at J15 (CURRENT SENSE). At this pin, the voltage is equal to current
± 10%. For instance, if a motor is being driven and it is drawing 0.9 amps, the voltage
at the header is 0.9 volts (± 10%).