Microchip Technology PICDEM™ Mechatronics Demonstration Board User’s Guide

PICDEM™ Mechatronics

Demonstration Board

User’s Guide

Note the following details of the code protection feature on Microchip devices:

• Microchip products meet the specification contained in their particular Microchip Data Sheet.

• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digit al Millennium Copyright Act. If suc h a c t s allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding device applications and t he lik e is provided only for your convenience and may be su perseded by upda t es . It is y our responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life supp ort and/or safety ap plications is entir ely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless M icrochip from any and all dama ges, claims, suits, or expenses re sulting from such use. No licens es are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.

Trademarks

The Microchip name and logo, the Microchip logo, Accuron, dsPIC, K

EELOQ, microID, MPLAB, PIC, PICmicro, PICSTART,

PRO MATE, PowerSmart, rfPIC and SmartShunt are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

AmpLab, FilterLab, Migratable Memory, MXDEV, MXLAB, SEEVAL, SmartSensor and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A.

Analog-for-the-Digital Age, Application Maestro, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, Linear Active Thermistor, Mindi, MiWi, MPASM, MPLIB, MPLINK, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartT el, Total Endurance, UNI/O, WiperLock and ZENA are trademarks of Microchip Technology I ncorporat ed in the U.S.A. and other countries.

SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their respective companies.

Printed on recycled paper.

Microchip received ISO/TS-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona, Gresham, Oregon and Mountain View, California. The Company’s quality system processes and procedures are for its PICmicro EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified.

8-bit MCUs, KEELOQ

code hopping devices, Serial

PICDEMTM MECHATRONICS

DEMO BOARD USER’S GUIDE

Table of Contents

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

Chapter 1. PICDEM™ Mechatronics

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

1.2 Highlight s ......... ............. .. .. ........................... .. .. ........................... .. .. ................ 7

1.3 Quick Star t G u id e .................... .. ..................................................................... 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

2.3 Example Pr o je c ts ........... .. ........................... .. .. .............. .. .. ............. .. ... ......... 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 Pr o b le m s ......... .................................................................. ... .. ....... 47

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

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

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

PICDEMTM Mechatronics Demo Board User’s Guide

3.2.3 FAULT LED Stays On Or Continues To Trip When SW5 Is Pressed ........47

3.2.4 Microcontroller Does Not Run After Programming By The MPLAB

ICD 2 ......................................................................................................48

3.2.5 Back EMF At J16 Is Floating ......................................................................48

3.2.6 Board Is Non-Functional When Microcontrollers Are Installed In Both

U1 And U2 .............................................................................................48

3.2.7 Optical Interrupter Is Not Providing The Expected Feedback ....................48

3.2.8 Serial Communication Does Not Appear To Be Working ..........................48

Appendix A. Hardware Schematics

A.1 Introduction ..................................................................................................49

Appendix B. LCD Segment Mapping Worksheet

B.1 Introduction ..................................................................................................57

Worldwide Sales and Service .....................................................................................60

PICDEMTM MECHATRONICS

DEMO BOARD USER’S GUIDE

Preface

NOTICE TO CUSTOMERS

All documentation becomes dated, and this manual is no exception. Microchip tools and documentation are constantly evolving to meet customer needs, so some actual dialogs and/or tool descriptions may differ from those in this document. Please refer to our web site (www.microchip.com) to obtain the latest documentation available.

Documents are identified with a “DS” number. This number is located on the bottom of each page, in front of the page number. The numbering convention for the DS number is “DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the document.

For the most up-to-date information on development tools, see the MPLAB Select the Help menu, and then Topics to open a list of available on-line help files.

INTRODUCTION

IDE on-line help.

This chapter contains general information about this user’s guide and customer support that will be useful prior to using the PICDEM™ Mechatronics development kit. Items discussed in this chapter are:

• Document Layout

• Conventions Used in this Guide

• Warranty Registration

• Recommended Reading

• The Microchip Web Site

• Development Systems Customer Notification Service

• Customer Support

• Document Revision History

• Troubleshooting

PICDEMTM Mechatronics Demo Board User’s Guide

DOCUMENT LAYOUT

This document describes how to use the PICDEM™ Mechatronics Demonstration Board. The manual layout is as follows:

• Chapter 1: PICDEM Mechatronics – An overview of the PICDEM Mechatronics Demo Board. PCB layout, parts and how to connect the provided jumper wires to the board.

• Chapter 2: Example Projects – Projects that describe how to read the sensors on the board, drive the LCD and control several motors. These motors include a Brushed DC (BDC) motor and a bipolar stepper motor.

• Chapter 3: Troubleshooting – Provides resolutions for solving common problems associated with using the PICDEM Mechatronics Demo Board.

• Appendix A: Hardware Schematics – Illustrates the PICDEM Mechatronics Demo Board hardware schematic diagrams.

• Appendix B: LCD Segment Mapping Worksheet – Provides the LCD Segment Mapping Worksheet.

CONVENTIONS USED IN THIS GUIDE

This manual uses the following docum entat io n conven tion s:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Code (Courier font):

Plain characters Sample code

Filenames and paths Angle brackets: < > Variables <label>, <exp> Square brackets [ ] Optional arguments MPASMWIN [main.asm] Curly brackets and pipe

character: { | } Lowercase characters i n

quotes Ellipses... Used to imply (but not show) addi-

0xnnn A hexadecimal number where n is a

Italic characters A variable argument; it can be either a

Interface (Arial font):

Underlined, italic text with right arrow

Bold characters A window or dialog button to click OK, Cancel Characters in angle

brackets < >

Documents (Arial font):

Italic characters Referenced books “MPLAB

Choice of mutually exclusive argu-

ments; An OR selection

Type of data “filename”

tional text that is not relevant to the

example

hexadecimal digit

type of data (in lowercase characters)

or a specific example (in uppercase

characters).

A menu selection from the menu bar File > Save

A key on the keyboard <Tab>, <Ctrl-C>

Preface

#define START c:\autoexec.bat

errorlevel {0|1}

list

“list_option...,

[

“list_option”]

0xFFFF, 0x007A

char isascii (char, ch);

IDE User’s

Guide”

PICDEMTM Mechatronics Demo Board User’s Guide

WARRANTY REGISTRATION

Please complete the enclosed Warranty Registration Card and mail it promptly. Sending in your Warranty Registration Card entitles you to receive new product updates. Interim software releases are available at the Microchip web site.

1.1 INTRODUCTION

The PICDEM™ Mechatronics is intended to be a learning tool for individuals interested in Mechatronic design. Mechatronics refers to integrating electronic controls into mechanical systems or replacing mechanical components with an electronic solution.

PICmicro size, high efficiency, speed and abundance of peripheral configurations. Mechatronic systems range in complexity from a simple electromechanical switch with output multiplexing to the complex stabilizer control of a supersonic jet. The appliance and automotive markets are notable markets in which mechatronic designs are becoming more common place. The modern washing machine, for instance, once an entirely mechanical design, incorporates microcontrollers to manage cycle times, read human inputs and regulate the speed of the agitate and spin cycles.

This chapter introduces the PICDEM™ Mechatronics development board. It describes the PCB layout, parts and electrical connection to the PICkit™ 2 Flash Programmer and MPLAB ICD 2 In-Circuit Debugger.

PICDEMTM MECHATRONICS

DEMO BOARD USER’S GUIDE

microcontrollers are ideal for use in Mechatronic systems due to their small

1.2 HIGHLIGHTS

This chapter discusses:

• Quick Start Guide

• The PICDEM™ Mechatronics Development Kit Contents

• The PICDEM™ Mechatronics Layout

• Required Tools

• PICDEM™ Mechatronics Setup

• General PICDEM™ Mechatronics Information

PICDEMTM Mechatronics Demo Board User’s Guide

1.3 QUICK START GUIDE

The PICDEM Mechatronics Demo Board is programmed at the factory with a demonstration program. The board must be configured as described in this chapter in order to use the demonstration program. Once the board is configured and powered up, the speed of the Brushed DC (BDC) motor on the board may be varied using the potentiometer (POT1). The 8-bit hexadecimal interpretation of the position of POT1 is displayed on the LCD.

Board Setup

Using the provided wire jumpers, screwdriver and shunts (2-pin black hard plastic jumpers), configure the board as shown in Figure 1-1.

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

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

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

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

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

Board Power-Up

Supply power to the board in one of the following ways:

• Connect a 9-12 V

terminals.

• Connect a 9 V

• Connect a 5 V

Note:

The power supply part number is AC162039 (see buy.microchip.com). Packaged with the MPLAB ICD 2, the part number is DV164007.

DC (0.75 amp minimum) supply using J9 (see note below) DC (0.75 amp minimum) supply to the P21 and P20 screw

DC battery to the battery connector. DC (1.2 amp minimum) supply to TP2 or TP3.

Demonstration Program

Press CLR FAULT (SW5), which is near the bottom right corner of the board. Turn POT1 clockwise to increase the speed of the motor. Note that the number displayed on the LCD increases as you turn the potentiometer clockwise.

Try experimenting with the other sensors on the board:

• Move the jumper wire on POT1 (J4) to Light (J4). Vary the intensity of light shining

on the light sensor located near the top left corner of the board. Notice what happens to the motor.

• Move the jumper to TEMP (J4). Blow on the temperature sensor located on the

top left corner of the board. Note what happens to the number displayed on the LCD.

• Move the jumper back to POT1. Move the jumper from N2 (J1) to D0 (J14). Watch

what happens to the intensity of LED D0 as you turn the potentiometer.

PICDEM™ Mechatronics

FIGURE 1-1: QUICK BOARD SETUP

PICDEMTM Mechatronics Demo Board User’s Guide

1.4 PICDEM™ MECHATRONICS DEVELOPMENT KIT CONTENTS

The PICDEM™ Mechatronics Development Kit contains the following items:

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

2. Pre-programmed PIC16F917 PICmicro

3. 10 wire jumpers

4. 8 2-pin shunts

5. CD-ROM including:

• PICDEM™ Mechatronics User’s Guide

• Workshop-in-a-Box presentation for training students on the board

(speaker notes included)

• Data sheets for the PIC16F91X, PIC16F631/677/685/687/689/690

and motors

• Application notes and other technical documentation

6. Sample kit including a PIC16F690 and PIC12F509 device

7. Microchip screwdriver

8. Registration Card

1.5 PICDEM™ MECHATRONICS LAYOUT

device

The PICDEM™ Mechatronics is shown in Figure 1-2. A PIC16F917 microcontroller is populated in the 40-pin socket, in which 22 out of the

36 available I/O pins are dedicated connections to several components on the board. The remaining 14 pins are available for the user to connect to the other components on the board, using the provided jumper wires. The dedicated connections connect to the following components:

• Switch 1 – 1 pin: MCLR

• LCD – 17 pins: VLCD1, VLCD2, VLCD3, COM0, COM1, COM2, COM3, SEG0,

SEG1, SEG2, SEG3, SEG6, SEG11, SEG16, SEG21, SEG22, SEG23

• In-Circuit Serial Programming™ Connector – ICSPDAT, ICSPCLK, MCLR

• RS-232 COM port – 2 pins: RX, TX

A 20-pin socket is provided and is compatible with 8/14/20-pin Flash-based microcontrollers. A PIC16F690 microcontroller is provided to use in the 20-pin socket, in which 5 out of the 18 available I/O pins are dedicated connections to several components on the board. The remaining 13 pins are available for the user to connect to the other components on the board using the provided jumper wires. The dedicated connections connect to the following components:

• Switch 1 – 1 pin: MCLR

• In-Circuit Serial Programming (ICSP™) Connector – ICSPDAT, ICSPCLK, MCLR

• RS-232 COM port: RX, TX

Note: Only one microcontroller should be loaded into the board at any given time.

Dedicated pins are indicated by a white box enclosing the pin designation next to each socket. Pay close attention to this designation, as the functionality of the dedicated pins are affected by the circuitry these pins are connected to. It is recommended that you use only the pins not designated as dedicated connections in your design.

The remaining components on the board must be connected to the microcontroller using the provided wire jumpers. The jumpers connect between the headers on either side of the microcontroller and the header pins next to the respective components on the board. The components on the board are labeled in Figure 1-2.

PICDEM™ Mechatronics

)

FIGURE 1-2: PICDEM MECHATRONICS DEMO BOARD HARDWARE

Legend:

6. RS-232 socket and associated

DC battery

hardware

7. Temperature sensor

8. Light sensor

9. 2 potentiometers

10. 32.768 kHz crystal

11. 4 tactile switches

12. In-Circuit Debugg er (ICD) co nne ctor13. In-Circuit Serial Programming™

(ICSP™) connector

Reset switch

associated MOSFET drivers and

logic

14. Over-current protection circuit with

15. 4 half-bridge MOSFET drives wit h

sense

speed of the Brushed DC motor

16. Current sense for output stage

17. Back Electromagnetic Force (EMF

18. Optical Interrupter for detecting the

19. Brushed DC motor

20. Stepper motor

21. Drive screw terminals

22. 9 V

power connections

1. 40-pin socket

2. 20-pin socket

3. On-board voltage regulator and

pins on the 40-pin socket

4. 8 LEDs

5. 39 segment LCD connected to 14

PICDEMTM Mechatronics Demo Board User’s Guide

The reasons for requiring you to use the provided jumpers to connect components to the microcontroller are three-fold.

1. Y ou will gain knowledge and experience by physically connecting components to the microcontroller.

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

3. Should you choose to use the board to experiment on your own, the board allows you the flexibility to do so. You can try experimenting with peripherals not covered in the projects in Chapter 2. “Example Projects”.

1.6 REQUIRED TOOLS

One of the following programming tools is needed in order to complete the projects in the next chapter:

• PICkit™ 2 Microcontroller Programmer (Part# DV164120)

• MPLAB

Figures 1-3 and 1-4 illustrate how to connect each of these tools to the PICDEM Mechatron ics Demo Board.

ICD 2 In-Circuit Debugger/Programmer (Part# DV164007 includes a

DC power supply and serial cable)

1.7 PICDEM™ MECHATRONICS SETUP

Please take a moment to review the following steps, prior to using the board. These steps ensure the board is configured correctly before beginning the projects.

1.7.1 Jumper Settings

Remove all 2-pin shunts (jumpers), except for JP8. On JP8, the shunt should be connected in the right most position (indicated by the “+5V” label), which ensures that the drive stage is powered by +5 V

1.7.2 Board Power-Up

Supply power to the board in one of the following ways:

• Connect a 9-12 V

is grounded externally and positive internally.

• Connect a 9-12 V

terminals.

• Connect a 9 V

• Connect a 5 VDC (1.2 amp minimum) supply to TP2 or TP3.

When power is initially connected, the “PWR ON” LED should light up. The “FAULT” LED in the over-current sense circuit will also be on when the board is powered up. Clear the Fault by pressing SW5 (CLR FAULT) switch. The board is now properly configured for the projects.

DC (0.75 amp minimum) supply via J9. The connector’s polarity

DC (0.75 amp minimum) supply to the P21 and P20 screw

DC battery to the battery connector.

DC.

PICDEM™ Mechatronics

FIGURE 1-3: CONNECTING THE MPLAB ICD 2 TO THE PICDEM

MECHATRONICS DEMO BOARD

PICDEM™ Mechatronics

MICROCHIP

MPLAB

BUSY

ERROR

POWE

ICD 2

FIGURE 1-4: CONNECTING THE PICkit™ 2 TO THE PICDEM

MECHATRONICS DEMO BOARD

PICDEM™ Mechatronics

PICDEMTM Mechatronics Demo Board User’s Guide

1.8 GENERAL PICDEM™ MECHATRONICS DEMONSTRATION BOARD INFORMATION

Power Supply Maximum Ratings

Supply voltage: 12 VDC Output current (drive stage): 1.2A (total)

1.8.1 Experimentation

The PICDEM Mechatronics Demo Board was designed for your experimentation. After completing the projects in Chapter 2. “Example Projects”, please experiment freely on your own. Voltage power supplies and motors, other than those provided in the kit, may be used.

The driver portion of the board (the part that supplies power to the motors) has an over-current sense circuit and will trip should the motor draw more than 1.2 amps. The LM7805 regulator also protects the circuit by limiting the current consumed by the board. Logic has also been put in place to ensure that the P and N-Channel MOSFET s connected to each of the output drives can not be turned on simultaneously.

Note: Although reasonable measures have been taken to protect the board from

the occasional mistake, THE BOARD MA Y BE DAMAGED if proper design techniques are not used and special attention to the schematic is not made.

1.8.2 On-Board Status LEDs

There are eight status LEDs on the board specifically provided to assist the user in the developing and debugging of your code. The user can output register values on one of the Ports of the microcontroller and have a binary reading of the value of that register. Connect the LEDs as shown in Figure 1-5. For instance, if it is suspected that the STATUS register is not being set appropriately , move the STATUS value into PORTC. If PORTC is attached as shown in Figure 1-5, the LEDs will show the value of STATUS.

PICDEM™ Mechatronics

FIGURE 1-5: CONNECTING PORTC PINS TO LEDS FOR DEBUGGING

1.8.3 OVER-CURRENT PROTECTION CIRCUIT

The over-current protection circuit included on the board shuts down the drive portion of the circuit if the board drives 1.2 amps continually for 100 ms or longer. Upon powering up the board, the “FAULT” LED will be on. The drive circuit must be reset manually by pressing the CLEAR FAULT button in the lower right hand portion of the board every time the board is initially supplied with power. Otherwise, a Fault is present when the “FAUL T” LED is illuminated and must be manually reset by pressing the same button. If you use your own motor, keep current draw less than 1.2A, as the over-current protection circuit will not allow driving a motor at or above this rating.

1.8.4 MOTOR CONNECTION

The motors provided on the PICDEM Demo Board must be manually connected to the Drive screw terminals. The kit includes a Microchip screwdriver to facilitate in making these connections.

Note: The supplied Brushed DC motor and Bipolar Stepper motor are subject to

change as the motor manufacturers cannot guarantee the same model numbers will be available indefinitely. Please refer to Microchip’s web page (www.microchip.com) for the current data sheets for the motors supplied with this kit, if the motor supplied on your board differs from the motor data sheets found on the CD-ROM.

1.8.5 SERIAL COMMUNICATION

The JP2 jumper is normally not populated with a shunt. With no shunt present, the board is configured for serial communications via the PICmicro Connecting a shunt between the bottom two pins (TX and RX) allows the user to transmit and receive serial communication via one pin (jumper between the microcontroller and the TX/RX pin on JP2).

USART (or EUSAR T).

PICDEMTM Mechatronics Demo Board User’s Guide

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.

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 of 0-5 V 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.

DC. Resistor locations, R55 and R56, are provided for this purpose. These

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%).

DC, the Back EMF must be scaled down into a range

+ 44 hidden pages

Microchip Technology PICDEM™ Mechatronics Demonstration Board User’s Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

1.1 INTRODUCTION

1.2 HIGHLIGHTS

1.3 QUICK START GUIDE

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

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

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

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

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

FIGURE 1-1: QUICK BOARD SETUP

1.4 PICDEM™ MECHATRONICS DEVELOPMENT KIT CONTENTS

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

3. 10 wire jumpers

4. 8 2-pin shunts

5. CD-ROM including:

6. Sample kit including a PIC16F690 and PIC12F509 device

7. Microchip screwdriver

8. Registration Card

1.5 PICDEM™ MECHATRONICS LAYOUT

FIGURE 1-2: PICDEM MECHATRONICS DEMO BOARD HARDWARE

7. Temperature sensor

8. Light sensor

9. 2 potentiometers

11. 4 tactile switches

16. Current sense for output stage

19. Brushed DC motor

20. Stepper motor

21. Drive screw terminals

1. 40-pin socket

2. 20-pin socket

4. 8 LEDs

1.6 REQUIRED TOOLS

1.7 PICDEM™ MECHATRONICS SETUP

1.7.1 Jumper Settings

1.7.2 Board Power-Up

1.8 GENERAL PICDEM™ MECHATRONICS DEMONSTRATION BOARD INFORMATION

1.8.1 Experimentation

1.8.2 On-Board Status LEDs

FIGURE 1-5: CONNECTING PORTC PINS TO LEDS FOR DEBUGGING

1.8.3 OVER-CURRENT PROTECTION CIRCUIT

1.8.4 MOTOR CONNECTION

1.8.5 SERIAL COMMUNICATION

1.8.6 SNAP-OFF SENSORS

1.8.7 BACK EMF SCALING RESISTORS

1.8.8 CURRENT SENSE