Arduino教程——旋转编码器

我们使用的旋转编码器时序为

→ CW(顺时针)

A ----------- --------------HIGH

---------- LOW



← CCW(逆时针)

B-------- ------------------HIGH

---------- LOW




ENA脚下降沿触发时查询B脚的电平,若为低电平时,由时序图可知为顺时针方向旋转(CW),Position增加1

而ENA脚上升沿触发时查询B脚的电平,若为高电平时,由时序图可知为顺时针方向旋转(CW),Position已增加1,故此时我们不再考虑

ENA脚下降沿触发时查询B脚的电平,若为高电平时,由时序图可知为逆时针方向旋转(CCW),Position减少1

而ENA脚上升沿触发时查询B脚的电平,若为低电平时,由时序图可知为逆时针方向旋转(CCW),Position已减少1,故此时我们不再考虑




编码器模块已设置了对ENA ENB的上拉以及按键SW的上拉

将ENA ENB SW依次连接到传感器扩展板或者Arduino主控板的数字脚2、3、4上

VCC GND依次连接到+5V和GND上

下载运行代码,打开串口监视器Serial Monitor

旋转编码器可看到顺时针旋转时旋转过一个编码点后数值会增加1

逆时针旋转则相应减少1

按下按键时旋转编码器模块板载的LED会被点亮,同时串口监视器中会显示"Switch Pressed"



[C++] 纯文本查看 复制代码

/*
RotaryEncoder

Read a rotary encoder with interrupts
Read the press action with digitalread
Encoder&Switch hooked up with common to +5V
ENCODER_A_PIN to pin 2
ENCODER_A_PIN to pin 3
SWITCH_PIN to pin 4

Published by ArduinoCN&OpenJumper.For surport
materials and a full range of system boards &
periphrals please visit :
[url=http://www.arduino.cn]http://www.arduino.cn[/url]
[url=http://www.openjumper.com]http://www.openjumper.com[/url]
created & modified 15 Dec 2012
by i3water
*/

#define ENCODER_A_PIN 2
#define ENCODER_B_PIN 3
#define SWITCH_PIN 4
long position;

void setup(){
//setup our pins 初始化我们的需要的引脚
pinMode(ENCODER_A_PIN, INPUT);
pinMode(ENCODER_B_PIN, INPUT);
pinMode(SWITCH_PIN, INPUT);

attachInterrupt(0, read_quadrature, CHANGE);

//setup our serial 初始化Arduino串口
Serial.begin(9600);
}

void loop(){
if (digitalRead(SWITCH_PIN) == LOW){
delay(10);
if (digitalRead(SWITCH_PIN) == LOW){
Serial.println("Switch Pressed");
}
}
Serial.print("Position: ");
Serial.println(position, DEC);
delay(1000);
}

void read_quadrature(){
// found a low-to-high on channel A ENA脚下降沿中断触发
if (digitalRead(ENCODER_A_PIN) == LOW){
// check channel B to see which way 查询ENB的电平以确认是顺时针还是逆时针旋转
if (digitalRead(ENCODER_B_PIN) == LOW)
position++;
}
// found a high-to-low on channel A ENA脚上升沿中断触发
else{
// check channel B to see which way 查询ENB的电平以确认是顺时针还是逆时针旋转
if (digitalRead(ENCODER_B_PIN) == LOW)
position--;
}
}






via - arduino中文社区

标签: Arduino教程