Microchip Technology PICDEM Mechatronics Demo Board DM163029 DM163029 User Manual
Product codes
DM163029
PICDEM
TM
Mechatronics Demo Board User’s Guide
DS51557C-page 48
©
2006 Microchip Technology Inc.
3.2.4
Microcontroller Does Not Run After Programming By The
MPLAB ICD 2
MPLAB ICD 2
When using the MPLAB ICD 2 as a programmer, the microcontroller will not run unless
you disconnect the MPLAB ICD 2 or release the MPLAB ICD 2 from Reset. Figure 3-1
shows the “Release From Reset” button.
you disconnect the MPLAB ICD 2 or release the MPLAB ICD 2 from Reset. Figure 3-1
shows the “Release From Reset” button.
FIGURE 3-1:
RELEASE FROM RESET BUTTON
3.2.5
Back EMF At J16 Is Floating
Check that a Fault has not occurred by checking that the FAULT LED is off. Verify the
Brushed DC motor is connected between DRIVE 1 and DRIVE 2. In order to measure
Back EMF, DRIVE 1 must float and DRIVE 2 must be grounded (i.e., the N-channel
MOSFET for Drive 2 is the only MOSFET turned on).
Brushed DC motor is connected between DRIVE 1 and DRIVE 2. In order to measure
Back EMF, DRIVE 1 must float and DRIVE 2 must be grounded (i.e., the N-channel
MOSFET for Drive 2 is the only MOSFET turned on).
3.2.6
Board Is Non-Functional When Microcontrollers Are Installed In
Both U1 And U2
Both U1 And U2
Only one microcontroller should be installed on the board at any given time.
3.2.7
Optical Interrupter Is Not Providing The Expected Feedback
The optical interrupter circuit is susceptible to interference from outside infrared light
sources (i.e., incandescent lights, sunlight, etc.). It may be necessary to block this
source or turn off the light source when using the optical interrupter.
sources (i.e., incandescent lights, sunlight, etc.). It may be necessary to block this
source or turn off the light source when using the optical interrupter.
3.2.8
Serial Communication Does Not Appear To Be Working
If using the USART on the PIC16F690 or PIC16F917, note that the TX and RX pins are
already connected. Make sure there is no shunt present on JP2.
already connected. Make sure there is no shunt present on JP2.