Manuali utente per Microchip Technology PICDEM Mechatronics Demo Board DM163029

Sommario

• 1.1 Introduction 7

  3
• 1.2 Highlights 7

  3
• 1.3 Quick Start Guide 8

  3
• 1.4 PICDEM™ Mechatronics Development Kit Contents 10

  3
• 1.5 PICDEM™ Mechatronics Layout 10

  3
• 1.6 Required Tools 12

  3
• 1.7 PICDEM™ Mechatronics Setup 12

  3
• 1.8 General PICDEM™ Mechatronics Demonstration Board Information 14

  3
• 2.1 Introduction 19

  3
• 2.2 Loading Projects in MPLAB® IDE 20

  3
• 2.3 Example Projects 20

  3
• 3.1 Introduction 47

  3
• 3.2 Common Problems 47

  3
• A.1 Introduction 49

  4
• B.1 Introduction 57

  4
  • Preface

    5
• 1.1 Introduction

  11
• 1.2 Highlights

  11
• 1.3 Quick Start Guide

  12
  • 1. Attach the leads of the Brushed DC motor to Drive 1 and Drive 2 using the screwdriver.

    12
  • 2. Connect POT1 (on J4) to C1- (on J13) using a wire jumper.

    12
  • 3. Connect P1 (on J1) to RD7 (on J10) using a wire jumper.

    12
  • 4. Connect N2 (on J1) to RD2 (on J10) using a wire jumper.

    12
  • 5. Connect the right and center pins on JP8 using a shunt.

    12
  • Figure 1-1: Quick Board Setup

    13
• 1.4 PICDEM™ Mechatronics Development Kit Contents

  14
  • 1. The PICDEM™ Mechatronics Printed Circuit Board (PCB) with motors

    14
  • 2. Pre-programmed PIC16F917 PICmicro® device

    14
  • 3. 10 wire jumpers

    14
  • 4. 8 2-pin shunts

    14
  • 5. CD-ROM including:

    14
  • 6. Sample kit including a PIC16F690 and PIC12F509 device

    14
  • 7. Microchip screwdriver

    14
  • 8. Registration Card

    14
• 1.5 PICDEM™ Mechatronics Layout

  14
  • Figure 1-2: PICDEM Mechatronics demo Board Hardware

    15
    • 1. 40-pin socket

      15
    • 2. 20-pin socket

      15
    • 3. On-board voltage regulator and power connections

      15
    • 4. 8 LEDs

      15
    • 5. 39 segment LCD connected to 14 pins on the 40-pin socket

      15
    • 6. RS-232 socket and associated hardware

      15
    • 7. Temperature sensor

      15
    • 8. Light sensor

      15
    • 9. 2 potentiometers

      15
    • 10. 32.768kHz crystal

      15
    • 11. 4 tactile switches

      15
    • 12. In-Circuit Debugger (ICD) connector

      15
    • 13. In-Circuit Serial Programming™ (ICSP™) connector

      15
    • 14. Over-current protection circuit with Reset switch

      15
    • 15. 4 half-bridge MOSFET drives with associated MOSFET drivers and logic

      15
    • 16. Current sense for output stage

      15
    • 17. Back Electromagnetic Force (EMF) sense

      15
    • 18. Optical Interrupter for detecting the speed of the Brushed DC motor

      15
    • 19. Brushed DC motor

      15
    • 20. Stepper motor

      15
    • 21. Drive screw terminals

      15
    • 22. 9 Vdc battery

      15
    • 1. You will gain knowledge and experience by physically connecting components to the microcontrol...

      16
    • 2. There are more peripherals than pins on the microcontrollers so that you can do more with the ...

      16
    • 3. Should you choose to use the board to experiment on your own, the board allows you the flexibi...

      16
• 1.6 Required Tools

  16
• 1.7 PICDEM™ Mechatronics Setup

  16
  • 1.7.1 Jumper Settings

    16
  • 1.7.2 Board Power-Up

    16
  • Figure 1-3: Connecting the MPLAB ICD 2 to the PICDEM Mechatronics demo Board

    17
  • Figure 1-4: Connecting the PICkit™ 2 to the PICDEM Mechatronics demo Board

    17
• 1.8 General PICDEM™ Mechatronics Demonstration Board Information

  18
  • 1.8.1 Experimentation

    18
  • 1.8.2 On-Board Status LEDs

    18
  • Figure 1-5: Connecting PORTC pins to LEDs for Debugging

    19
    • 1.8.3 Over-Current Protection Circuit

      19
    • 1.8.4 Motor Connection

      19
    • 1.8.5 Serial Communication

      19
    • 1.8.6 Snap-Off Sensors

      20
    • 1.8.7 Back EMF Scaling Resistors

      20
    • 1.8.8 Current Sense

      20
    • 1.8.9 Header/Jumper Functions

      21
• 2.1 Introduction

  23
• 2.2 Loading Projects in MPLAB® IDE

  24
  • 1. Start MPLAB IDE.

    24
  • 2. In the menu bar choose File -> Open Workspace.

    24
  • 3. Find the project folder.

    24
  • 4. Open the *.mcw file.

    24
  • Figure 2-1: Project Window

    24
• 2.3 Example Projects

  24
  • 2.3.1 Project 1: Hello World (Light a LED)

    25
    • 1. Use the PIC16F917 to read a tactile switch input.

      25
    • 2. Implement switch debouncing.

      25
    • 3. Toggle a LED when a switch is pushed.

      25
  • Figure 2-2: Project 1: Jumper Diagram

    25
  • Figure 2-3: Project 1: Schematic

    25
    • 2.3.2 Project 2: Dusk Indicator Using the Voltage Comparator

      27
      • 1. Use the internal analog comparator module.

        27
      • 2. Implement software hysteresis to stabilize the comparator output.

        27
  • Figure 2-4: Project 2: Jumper Diagram

    27
  • Figure 2-5: Project 2: Schematic

    28
    • 2.3.3 Project 3: Thermometer Using the Analog-to-Digital Converter

      29
      • 1. Use the Analog-to-Digital Converter module on the PIC16F917 to read the analog voltage output ...

        29
      • 2. Gain knowledge about the LCD module and using the LCD module worksheet.

        29
  • Figure 2-6: Project 3: Jumper Diagram

    29
  • Figure 2-7: Project 3: Schematic

    29
    • 2.3.4 Project 4: Digital Clock Using Timer1

      31
      • 1. Configure the PIC16F917 to use the 32.768kHz crystal to clock Timer1.

        31
      • 2. Convert Timer1 into seconds, minutes and hours.

        31
  • Figure 2-8: Project 4: Jumper Diagram

    31
  • Figure 2-9: Project 4: Schematic

    32
    • 2.3.5 Project 5: Brushed DC Motor Speed Control with Optical Encoder Feedback

      33
      • 1. Configure the CCP module to generate a PWM signal.

        33
      • 2. Use a PWM signal to vary the speed of a Brushed DC motor.

        33
      • 3. Configure Timer1 to use the optical interrupter as its clock source.

        33
  • Figure 2-10: Project 5: Jumper Diagram

    34
  • Figure 2-11: Project 5: Schematic

    35
    • 2.3.6 Project 6: Brushed DC Speed Control with Back EMF Feedback

      36
      • 1. Effectively read Back EMF using the on-board Analog-to-Digital Converter.

        36
      • 2. Interpret the Back EMF into a speed for the motor.

        36
  • Figure 2-12: Project 6: Jumper Diagram

    37
  • Figure 2-13: Project 6: Schematic

    38
    • 2.3.7 Project 7: Stepper Motor Control: Single Stepping, Half Stepping and Microstepping

      39
      • 1. Single-step a stepping motor.

        39
      • 2. Half-step the motor.

        39
      • 3. Micro-step the motor.

        39
  • Figure 2-14: Project 7: Jumper Diagram

    40
  • Figure 2-15: Project 7: Schematic

    41
    • 2.3.8 Project 8: PC Interface Using the USART

      43
      • 1. Use the provided PIC® MCU Communicator GUI to manipulate the I/O on the PIC16F917.

        43
      • 2. Understand what an auto-baud routine entails.

        43
  • Figure 2-16: Project 8: Jumper Diagram

    43
  • Figure 2-17: Project 8: Schematic

    44
  • Figure 2-18: PIC® MCU Communicator Interface

    44
    • 2.3.9 Project 9: Brushed DC Motor Control Using the ECCP

      46
      • 1. Configure the ECCP module for Full-Bridge mode.

        46
      • 2. Change motor directions.

        46
  • Figure 2-19: Project 9: Jumper Diagram

    47
  • Figure 2-20: Project 9: Schematic

    48
• 3.1 Introduction

  51
• 3.2 Common Problems

  51
  • 3.2.1 Vdd Is Below 5V

    51
  • 3.2.2 No Voltage On Drive Stage

    51
  • 3.2.3 FAULT LED Stays On Or Continues To Trip When SW5 Is Pressed

    51
  • 3.2.4 Microcontroller Does Not Run After Programming By The MPLAB ICD 2

    52
  • Figure 3-1: Release From Reset Button

    52
    • 3.2.5 Back EMF At J16 Is Floating

      52
    • 3.2.6 Board Is Non-Functional When Microcontrollers Are Installed In Both U1 And U2

      52
    • 3.2.7 Optical Interrupter Is Not Providing The Expected Feedback

      52
    • 3.2.8 Serial Communication Does Not Appear To Be Working

      52
• Appendix A. Hardware Schematics

  53
• A.1 Introduction

  53
  • Figure A-1: Schematic Diagram (Page 1 of 7)

    53
  • Figure A-2: Schematic Diagram (Page 2 of 7)

    54
  • Figure A-3: Schematic Diagram (Page 3 of 7)

    55
  • Figure A-4: Schematic Diagram (Page 4 of 7)

    56
  • Figure A-5: Schematic Diagram (Page 5 of 7)

    57
  • Figure A-6: Schematic Diagram (Page 6 of 7)

    58
  • Figure A-7: Schematic Diagram (Page 7 of 7)

    59
• Appendix B. LCD Segment Mapping Worksheet

  61
• B.1 Introduction

  61
  • Appendix B: LCD Segment Mapping Worksheet

    62
• Worldwide Sales and Service

  64