KyungHee Univ. 2-0 Chapter 8 Parallel Port Interfaces.

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Chapter 8 Parallel Port InterfacesChapter 8 Parallel Port Interfaces

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8.4 Transistors Used for Computer-Controlled Current Switches

전류 제어 Switch(BJT)

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8.5 Computer-Controlled Relays, Solenoids, and DC Motors 8.5.1 Introduction to Relays

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8.5.1 Introduction to Relays

제어 회로와 다른 전원으로 구동하는 Relay 의 예

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8.5.1 Introduction to Relays

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8.5.2 Electromagnetic Relays Basics

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8.5.3 reed Relays

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8.5.4 Solenoids

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8.5.4 Solenoids

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8.5.5 Pulse-Width Modulated DC Motors

DC 모터의 속도 제어 ( 모터에 가해지는 실효 전력을 제어 함 ) 를 위하여 펄스 폭 변조 기술을 사용 한다 .

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8.5.6 Interfacing EM Relays, Solenoids, and DC Motors

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Diode Maximum voltage (V)

1N4001 50

1N914 75

1N4002 100

1N4003 200

1N4004 400

1N4005 600

1N4006 800

1N4007 1000

Table 8.12 Maximum voltage parameter for typical snubber diodes

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DC Motor and Stepper Controller

Current Motor Supply Logic CurrentSensing Voltage Enable Supply Enable Sensing

A Out Out Vs In A In GND Vs In B In Out Out B 1 2 1 2 3 4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

1 2 3 4 5 6 GND Dir1 En1 Dir2 En2 Vcc In Put Control Signal Connector

+Vout 1Motor 1-Vout1

+Vout 2Motor 2-Vout2

VsSupplyVoltageGND

+-

470uF35V

104

1+

1+

2

4

3 3

4

2

Vs2W062W06

L298N

274141

474143

VsSupplyVoltageGND

Dual Full-Bridge Driver L298

High voltage : 46Vhigh current : 4ADual full-bridge driverAccept standard TTL logic levelsDrive inductive loads such as • Relays, Solenoids, DC and, Stepping motors

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L289 Block Diagram

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M M

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8.5.7 Solid-State Relays

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8.6 Stepper Motors

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8.6.1 Stepper Motors Example

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PORTBOutput

A A’ B B’

10 Activate Deactivate

Activate Deactivate

9 Activate Deactivate

Deactivate

Activate

5 Deactivate

Activate Deactivate

Activate

6 Deactivate

Activate Activate Deactivate

Table 8.13 Stepper motor sequence

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Program 8.24. A double circular linked list used to control the stepper motor.

// 6811 or 6812const struct State{ unsigned char Out; // Output const struct State *Next[2]; // CW/CCW};typedef struct State StateType;typedef StateType *StatePtr;#define clockwise 0 // Next index#define counterclockwise 1 // Next indexStateType fsm[4]={ {10,{&fsm[1],&fsm[3]}}, { 9,{&fsm[2],&fsm[0]}}, { 5,{&fsm[3],&fsm[1]}}, { 6,{&fsm[0],&fsm[2]}}};unsigned char Pos; // between 0 and 199 StatePtr Pt; // Current State

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Program 8.25. Helper functions used to control the stepper motor.

// 6811 or 6812// Move 1.8 degrees clockwise void CW(void){ Pt = Pt->Next[clockwise]; // circular PORTB = Pt->Out; // step motor if(Pos==199){ // shaft angle Pos = 0; // reset } else{ Pos++; // CW }}

// Move 1.8 degrees counterclockwisevoid CCW(void){ Pt = Pt->Next[counterclockwise PORTB = Pt->Out; // step motor if(Pos==0){ // shaft angle Pos = 199; // reset } else{ Pos--; // CCW }}

// Initialize Stepper interface void Init(void){ Pos = 0; Pt = &fsm[0]; DDRB = 0xFF; // 6812 only}

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Program 8.26. High-level function to control the stepper motor.

// 6811 or 6812 void Seek(unsigned char desired){short CWsteps; if((CWsteps=desired-Pos)<0){ CWsteps+=200; } // CW steps is 0 to 199 if(CWsteps>100){ while(desired<>Pos){ CCW(); } } else{ while(desired<>Pos){ CW(); } }}

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8.6.2 Basic Operation

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8.6.3 Stepper Motor Hardware Interface

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8.6.4 Stepper Motor Shaft Encoder

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KyungHee Univ. 2-0 Chapter 8 Parallel Port Interfaces.

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