Download Chapter 8 Parallel Port Interfaces

Chapter 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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8.4 Transistors Used for Computer-Controlled
Current Switches
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8.4 Transistors Used for Computer-Controlled
Current Switches
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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 Relay의 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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8.5.2 Electromagnetic Relays Basics
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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 기술
을 사용 한다.
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8.5.6 Interfacing EM Relays, Solenoids, and
DC Motors
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8.5.6 Interfacing EM Relays, Solenoids, and
DC Motors
Table 8.12 Maximum voltage parameter for typical snubber diodes
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Diode
1N4001
Maximum voltage (V)
50
1N914
75
1N4002
100
1N4003
200
1N4004
400
1N4005
600
1N4006
800
1N4007
1000
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8.5.6 Interfacing EM Relays, Solenoids, and
DC Motors
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8.5.6 Interfacing EM Relays, Solenoids, and
DC Motors
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8.5.6 Interfacing EM Relays, Solenoids, and
DC Motors
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8.5.6 Interfacing EM Relays, Solenoids, and
DC Motors
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8.5.6 Interfacing EM Relays, Solenoids, and
DC Motors
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8.5.6 Interfacing EM Relays, Solenoids, and
DC Motors
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8.5.6 Interfacing EM Relays, Solenoids, and
DC Motors
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8.5.6 Interfacing EM Relays, Solenoids, and
DC Motors
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8.5.6 Interfacing EM Relays, Solenoids, and
DC Motors
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8.5.6 Interfacing EM Relays, Solenoids, and
DC Motors
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DC Motor and Stepper Controller
L298N
Current
Sensing
Motor Supply
Voltage
A Out Out Vs
1 2
1
2 3
4
470uF
35V
In
1
5
Logic
Supply
Enable
A
6
In GND Vs
2
7
8 9
Current
Sensing
Enable
In
3
10
B
11
In Out
4
12 13
2
7414
1
+
-
2W06
2
1
+
4
2W06
Vs
3
104
1
2
3
4
5
6
GND Dir1 En1 Dir2 En2 Vcc
In Put Control Signal Connector
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15
+Vout 2
Motor 2
-Vout2
4
Vs
Supply
Voltage
GND
B
4
7414
3
2
+Vout 1
Motor 1
-Vout1
Out
3
1
+
Vs
Supply
Voltage
GND
Dual Full-Bridge Driver L298
 High voltage : 46V
 high current : 4A
 Dual full-bridge driver
 Accept standard TTL logic levels
 Drive inductive loads such as
• Relays, Solenoids, DC and, Stepping motors
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L289 Block Diagram
M
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8.5.7 Solid-State Relays
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8.5.7 Solid-State Relays
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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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8.6.1 Stepper Motors Example
Table 8.13 Stepper motor sequence
PORTB
Output
A
A’
B
B’
10
Activate
Deactivate
Activate
Deactivate
9
Activate
Deactivate Deactivate
5
Deactivate
Activate
Deactivate
Activate
6
Deactivate
Activate
Activate
Deactivate
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8.6.1 Stepper Motors Example
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Program 8.24. A double circular linked list
used to control the stepper motor.
// 6811 or 6812
const 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 index
StateType 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
}
}
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// Move 1.8 degrees counterclockwise
void 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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8.6.2 Basic Operation
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8.6.2 Basic Operation
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8.6.2 Basic Operation
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8.6.2 Basic Operation
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8.6.2 Basic Operation
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8.6.2 Basic Operation
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8.6.2 Basic Operation
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8.6.3 Stepper Motor Hardware Interface
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8.6.3 Stepper Motor Hardware Interface
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8.6.3 Stepper Motor Hardware Interface
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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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8.6.4 Stepper Motor Shaft Encoder
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8.6.4 Stepper Motor Shaft Encoder
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