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Damian MarksRekha Vemuri

Instructor: Dr. Wu

Simple control system for aStepper and DC motor using atachometer and the HC11

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Presentation Outline

Objective

BackgroundMethodology

Assembly language program

DiscussionConclusion

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Objective

The objective of the project is to control and

measure the speed of a motor

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Background

This project effectivelyutilizes both software andhardware. DC Motor Stepper motor Counter

SKAMP light sensor HC11 Evaluation Board

(EVB)

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Hardware Description

DC motor

Runs on Direct Current Speed can be controlled by changing the voltage

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Hardware Description (cont)

DC Motor

The motor converts electrical energy to mechanicalwork as the output shaft turns DC motors consist of one set of coils, called an

armature, inside another set of coils or a set ofpermanent magnets, called the stator.

Applying a voltage to the coils produces a torque inthe armature, resulting in motion.

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Hardware Description

Stepper Motor

Converts electrical pulses into discrete mechanicalrotational movements.

Has no brushes, or contacts Stepper motor receives a rectangular pulse train

and responds by rotating its shaft.

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Hardware Description

Stepper Motor

Pulse train is controlled bymeans of a Microcontroller. Requires no feed back loop and

sensors in controlling a steppermotor.

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Hardware Description

Stepper Motor Applications

Film advance

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Hardware Description

Stepper Motor Applications

Conveyor

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Hardware Description

Stepper Motor Applications

Labeling Machine

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Hardware Description

Stepper Motor

Applications Window Blind Gluing

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Hardware Description

Stepper Motor Applications Tube Cutter

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Hardware Description

Counter

PE0 PE1 PE2 PE3 PE4 PE5 PE6 PE7

Q0 Q1 Q2 Q3

Counter

Port E

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Hardware Description

Skan-A-Matic SKAMP light sensor

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Software

Buffallo HC11 Monitor Program

AS11.exe Compiler1 Assembly Programming LanguageTHR 68HC11 Sim V3.06

Hyper Terminal

The serial communicationprogram used to interface the HC11 with thePC.

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Software

Assembly Language Programming Modules

Real-time interrupt Delay Loop Counting Sub-routine Stepper Routine

Hexadecimal to ASCII character conversion sub-routine

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Real-timeFlow Chart

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Delay Sub-routine

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Rotate Sub-Routine Flowchart

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Counter Sub-RoutineFlowchart

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Problems Faced

Limited Memory on EVB Board

Limited Ports on EVB BoardReal-time Interrupts

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Conclusions

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Questions?