User manual

PICDEM

MECHATRONICS

DEMO BOARD USER’S GUIDE

Table of Contents

Preface ........................................................................................................................... 1

Chapter 1. PICDEM™ Mechatronics

1.1 Introduction ..................................................................................................... 7

1.2 Highlights ........................................................................................................ 7

1.3 Quick Start Guide ........................................................................................... 8

1.4 PICDEM™ Mechatronics Development Kit Contents ................................... 10

1.5 PICDEM™ Mechatronics Layout .................................................................. 10

1.6 Required Tools ............................................................................................. 12

1.7 PICDEM™ Mechatronics Setup ................................................................... 12

1.7.1 Jumper Settings ........................................................................................ 12

1.7.2 Board Power-Up ........................................................................................ 12

1.8 General PICDEM™ Mechatronics Demonstration Board Information .......... 14

1.8.1 Experimentation ........................................................................................ 14

1.8.2 On-Board Status LEDs .............................................................................. 14

1.8.3 Over-Current Protection Circuit ................................................................. 15

1.8.4 Motor Connection ...................................................................................... 15

1.8.5 Serial Communication ............................................................................... 15

1.8.6 Snap-Off Sensors ...................................................................................... 16

1.8.7 Back EMF Scaling Resistors ..................................................................... 16

1.8.8 Current Sense ........................................................................................... 16

1.8.9 Header/Jumper Functions ......................................................................... 17

Chapter 2. Example Projects

2.1 Introduction ................................................................................................... 19

2.2 Loading Projects in MPLAB

IDE ................................................................. 20

2.3 Example Projects ......................................................................................... 20

2.3.1 Project 1: Hello World (Light a LED) ....................................................................... 21

2.3.2 Project 2: Dusk Indicator Using the Voltage Comparator ........................................ 23

2.3.3 Project 3: Thermometer Using the Analog-to-Digital Converter .............................. 25

2.3.4 Project 4: Digital Clock Using Timer1 ..................................................................... 27

2.3.5 Project 5: Brushed DC Motor Speed Control with Optical Encoder Feedback ....... 29

2.3.6 Project 6: Brushed DC Speed Control with Back EMF Feedback .......................... 32

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

Microstepping ..................................................................................................... 35

2.3.8 Project 8: PC Interface Using the USART .............................................................. 39

2.3.9 Project 9: Brushed DC Motor Control Using the ECCP .......................................... 42

Chapter 3. Troubleshooting

3.1 Introduction ................................................................................................... 47

3.2 Common Problems ....................................................................................... 47

3.2.1 VDD Is Below 5V ........................................................................................ 47

3.2.2 No Voltage On Drive Stage ....................................................................... 47