旋轉編碼器消除彈跳

/*

  RotaryEncoderInterrupt sketch

  2017-01-19 test OK

 */

const int encoderPinA = 2;

const int encoderPinB = 3;

int Pos, oldPos;

volatile int encoderPos = 0; // variables changed within interrupts are volatile

void setup(){

  pinMode(6, OUTPUT);  digitalWrite(6, LOW); //encoder Gnd

  pinMode(encoderPinA, INPUT_PULLUP);

  pinMode(encoderPinB, INPUT_PULLUP);

  Serial.begin(115200);

  attachInterrupt(1, doEncoder, CHANGE); // encoder pin on interrupt 0 (pin 3)

 // attachInterrupt(0, doEncoder, FALLING); // encoder pin on interrupt 0 (pin 2)

}

void loop(){

  uint8_t oldSREG = SREG;

  cli();  Pos = encoderPos;  SREG = oldSREG;  if(Pos != oldPos)

  {

    Serial.println(Pos,DEC);    oldPos = Pos;

  }

  delay(10);

}

void doEncoder(){

  if (digitalRead(encoderPinA) == digitalRead(encoderPinB))

    encoderPos++;    // count up if both encoder pins are the same

  else

    encoderPos--;    //count down if pins are different

}

接著發現一個狀況~~

若需設定的值範圍很大時不就要轉很久 ...

利用轉動速度快慢(偵測脈波寬度)的方式來決定增量的值

/*

  RotaryEncoderInterrupt sketch

  2017-01-20 test OK

 */

const int encoderPinA = 2;

const int encoderPinB = 3;

int Pos, oldPos;

unsigned long duration;

volatile int encoderPos = 0; // variables changed within interrupts are volatile

void setup(){

  pinMode(6, OUTPUT);  digitalWrite(6, LOW); //encoder Gnd

  pinMode(encoderPinA, INPUT_PULLUP);

  pinMode(encoderPinB, INPUT_PULLUP);

  Serial.begin(115200);

  attachInterrupt(1, doEncoder, CHANGE); // encoder pin on interrupt 0 (pin 3)

 // attachInterrupt(0, doEncoder, FALLING); // encoder pin on interrupt 0 (pin 2)

}

void loop(){

  uint8_t oldSREG = SREG;

  cli();  Pos = encoderPos;  SREG = oldSREG;  if(Pos != oldPos){

    Serial.print(Pos,DEC); 

    Serial.print(",   Pulse Width /nS :");

    Serial.println(duration,DEC); 

    oldPos = Pos;

  }

  delay(10);

  duration = pulseIn(encoderPinA, HIGH,100000);

}

void doEncoder(){

  if (digitalRead(encoderPinA) == digitalRead(encoderPinB)){

    if(duration == 0 || duration >= 35001)encoderPos++;

    if(duration >= 1 && duration <= 35000)encoderPos += 20;

    if(duration >= 1 && duration <= 10000)encoderPos += 80;

  }   

  else{

    if(duration == 0 || duration >= 35001)encoderPos--;

    if(duration >= 1 && duration <= 35000)encoderPos -= 20;

    if(duration >= 1 && duration <= 10000)encoderPos -= 80;

     }

}

 轉一格有 1個訊號

//2018-06-26 test OK 

// http://yehnan.blogspot.com/2014/02/arduino.html

volatile long posCount = 0;

unsigned long t = 0;

void setup() {

  Serial.begin(115200);

  // 當狀態下降時，代表旋轉編碼器被轉動了

  attachInterrupt(1, rotaryEncoderChanged, FALLING);  //INT 1 -> pin 3

  pinMode(3, INPUT_PULLUP); // 輸入模式並啟用內建上拉電阻

  pinMode(4, INPUT_PULLUP); 

  pinMode(5, INPUT_PULLUP); 

  Serial.println("count reset to 0");

}

long position  = -999;

word position1,newPos1;

void loop() {

//delay(500);  

if (posCount != position) {

 position = posCount;

 Serial.println(position);

}

  if(digitalRead(5) == LOW){ // 按下開關，歸零

     posCount = 0;  

     delay(300);

  }

}

void rotaryEncoderChanged(){ // when CLK_PIN is FALLING

//  unsigned long temp = millis();  // 去彈跳

//  if(temp - t < 20)               // 去彈跳

//    return;                       // 去彈跳

//  t = temp;                       // 去彈跳

  

  // DT_PIN的狀態代表正轉或逆轉

  posCount += digitalRead(4) == HIGH ? 1 : -1;

 // Serial.println(count);

}

可以不使用中斷的 Library  ->   https://github.com/PaulStoffregen/Encoder

轉一格有 4個訊號