Rotary controller help

Other Hardware General Electronics
1

Hi everybody. I'm working on a project with a dc motor being controlled by an EC11 rotary encoder. The encoder works when I do the test sketches and responds as advertised, but it doesn't seem to be working with the dc motor. When I plug in the 12v, the DC motor starts as full power and does not respond to the encoder. Is there something wrong with the code and/or wiring?

[code]
//##################  Adjust these values accordingly #######################################

#define chB 2                           //***pin B of the rotary encoder (channel B)
#define chA 3                           //***pin A of the rotary encoder (channel A)
#define motorDir1 9                     //***motor direction forward pin to driver
#define motorDir2 10                    //***motor direction reverse pin to driver            
#define motorPWM 6                      //***PWM pin to motor controller 
#define pushButton 7                    //***Button pin
#define voltPin A0                      //***Analog pin for motor voltage measurement
#define arduinoVoltage 4.98             //***Actual measured 5 volt pin from the arduino
#define R1 25                           //***Actual resistance of 100k resistor
#define R2 8.95                         //***Actual resistance of 10k resistor
float rpmPerVolt = (4825 / 12);         //***DC motor max RPM (4825) divided by max voltage (12VDC. Measure both paraments and adjust
LiquidCrystal_I2C lcd(0x27, 20, 4);     //***Adjust screen address if needed. Use File > Examples > Wire > i2c_scanner to acquire address and change 0x3F as needed.

//##################  End of adjustable parameters #######################################

int eeAddress = 0;
int pwmMax;
int pwmVal = 0;
bool setFlag = false;

int fanSpeed = 0;                   //speed of the turbofan in RPM
int mtrSpeed = 0;                   //speed of the motor in RPM
int deadBand = 20;                  //minimum PWM signal for the motor to move
float vout = 0.0;                   //Voltage out of the motor
float roughVoltage = 0.0;
int avgInst = 350;                  //this should equal the sizeof(tempArray)
int voltCount = 0;
float tempArray[350];               //temp array for averaging voltage readings: array size = number of averaging points
float finalVolt = 0.0;              //averaged result
float oldVolt = 0.0;                //check to see if voltage changes after each loop

long timeNew = 0;                   //time stamp at beginning of loop
long timeOld = 0;                   //time stamp at end of end
long tempTimer = 0;
long oldPos = 0;                    //old position of the encoder
long newPos = 0;                    //new position of the encoder

Encoder myEncoder(chA, chB);

void setup() {
  //Serial.begin(115200);
  pinMode(voltPin, INPUT);
  pinMode(motorDir1, OUTPUT);
  pinMode(motorDir2, OUTPUT);
  pinMode(motorPWM, OUTPUT);
  pinMode(pushButton, INPUT_PULLUP);
  pinMode(chA, INPUT_PULLUP);
  pinMode(chB, INPUT_PULLUP);

  myEncoder.write(oldPos);
  digitalWrite(motorDir1, HIGH);  //motor direction (FWD = HIGH). DON'T CHANGE. SWITCH THE WIRES IF DIRECTION IS WRONG
  digitalWrite(motorDir2, LOW);   //motor direction (REV = LOW). DON'T CHANGE. SWITCH THE WIRES IF DIRECTION IS WRONG
  analogWrite(motorPWM, 0);

  lcd.init();
  lcd.setCursor ( 3, 0 );
  lcd.print("Turbofan Driver");
  lcd.setCursor ( 0, 2 );
  lcd.print("Adam B. Johnson");
  lcd.setCursor( 0, 3);
  lcd.print("BC, Canada");
  lcd.setCursor ( 16, 3 );
  lcd.print("2021");

  delay(4500);
  lcd.clear();
  screenSetup();
  zeroNums();
  printSpeeds();
  printVoltage();
  myEncoder.write(0);
  analogWrite(motorPWM, 0);
}

void loop() {
  newPos = myEncoder.read() ;
  timeNew = millis();
  EEPROM.get(eeAddress, pwmMax);

  if (voltCount < avgInst) {
    vout = (analogRead(voltPin) * arduinoVoltage) / 1024.0;             //Measure your 5VDC rail to ground with your DMM. Change 4.98 to whatever yours is
    roughVoltage = vout / (R2 / (R1 + R2));
    tempArray[voltCount] = roughVoltage;
  } else {
    voltCount = 0;
  }

  if (newPos > 0) {
    //Serial.println(newPos);
    if (timeNew - timeOld > 300) {
      finalVolt = 0.0;
      for (int i = 0; i < avgInst; i++) {
        finalVolt += tempArray[i];
      }
      timeOld = timeNew;
      finalVolt = finalVolt / avgInst;
      if (abs(finalVolt - oldVolt) > 0.03) {
        mtrSpeed = rpmPerVolt * finalVolt;
        fanSpeed = mtrSpeed / gearRatio;
        oldVolt = finalVolt;
        clearNums();
        printVoltage();
        printSpeeds();
      }
    }
  }
  voltCount++;

  if ((newPos != oldPos) && (newPos > 0) && (newPos < pwmMax - deadBand)) {
    pwmVal = newPos + deadBand;
    analogWrite(motorPWM, pwmVal);
    oldPos = newPos;
  }
  if ((newPos != oldPos) && (newPos <= 0) && (newPos < pwmMax - deadBand)) {
    delay(250);
    myEncoder.write(0);
    analogWrite(motorPWM, 0);
    clearNums();
    zeroNums();
    delay(50);
    myEncoder.write(0);
    analogWrite(motorPWM, 0);
  }
  if ((newPos != oldPos) && (newPos > 0) && (newPos >= pwmMax - deadBand)) {
    myEncoder.write(4 * (pwmMax - deadBand));
    analogWrite(motorPWM, pwmVal);
    pwmVal = pwmMax;
    oldPos = pwmMax - deadBand;
    mtrSpeed = mtrSpeed = rpmPerVolt * finalVolt;
    fanSpeed = mtrSpeed / gearRatio;
  }


  if (digitalRead(pushButton) == LOW) {
    //Serial.print("buttonPressed");
    delay(25);
    if (digitalRead(pushButton) == LOW) {
      //Serial.print("buttonStillPressed");
      setFlag = false;
      delay(500);
      if (digitalRead(pushButton) == LOW) {
        EEPROM.put(eeAddress, pwmVal);
        for (int i = 0; i < 20; i++) {
          lcd.setCursor(i, 0);
          lcd.print(" ");
        }
        lcd.setCursor(1, 0);
        lcd.print("Max Speed Set: ");
        lcd.setCursor(16, 0);
        lcd.print(fanSpeed);
        delay(3000);
        if (digitalRead(pushButton) == LOW) {
          EEPROM.put(eeAddress, 255);
          for (int i = 0; i < 20; i++) {
            lcd.setCursor(i, 0);
            lcd.print(" ");
          }
          lcd.setCursor(2, 0);
          lcd.print("Max Speed Reset");
          delay(3000);
        }
        for (int i = 0; i < 20; i++) {
          lcd.setCursor(i, 0);
          lcd.print(" ");
        }
        lcd.setCursor(3, 0);
        lcd.print("Turbofan Stats");
        setFlag = true;
      }
      if (setFlag == false) {
        myEncoder.write(0);
        analogWrite(motorPWM, 0);
        clearNums();
        zeroNums();
        setFlag = true;
      }
    }
  }

}



void printVoltage() {
  if ((finalVolt > 0) && (finalVolt < 10.0)) {
    lcd.setCursor (12, 3 );
  } else if ((finalVolt < 15.0) && (finalVolt >= 10.0)) {
    lcd.setCursor (11, 3 );
  } else {
    lcd.setCursor (12, 3 );
    finalVolt = 0;
  }
  lcd.print(finalVolt, 2);
}


void printSpeeds() {
  if (fanSpeed < 100 && fanSpeed >= 10) {
    lcd.setCursor(14, 1);
  } else if (fanSpeed < 1000 && fanSpeed >= 100) {
    lcd.setCursor (13, 1 );
  } else if (fanSpeed < 10000 && fanSpeed >= 1000) {
    lcd.setCursor (12, 1 );
  } else if (fanSpeed == 0) {
    lcd.setCursor (15, 1 );
  } else {
    lcd.setCursor (15, 1 );
    fanSpeed = 0;
  }
  lcd.print(fanSpeed);
  if (mtrSpeed < 100 && mtrSpeed >= 10) {
    lcd.setCursor(14, 2);
  } else if (mtrSpeed < 1000 && mtrSpeed >= 100) {
    lcd.setCursor (13, 2 );
  } else if (mtrSpeed < 10000 && mtrSpeed >= 1000) {
    lcd.setCursor (12, 2 );
  } else if (mtrSpeed == 0) {
    lcd.setCursor (15, 2 );
  } else {
    lcd.setCursor (15, 2 );
    mtrSpeed = 0;
  }
  lcd.print(mtrSpeed);
}


void clearNums() {
  for (int i = 11; i < 17; i++) {
    for (int j = 1; j < 4; j++) {
      lcd.setCursor (i, j);
      lcd.print(" ");
    }
  }
}


void zeroNums() {
  oldPos = 0;
  mtrSpeed = 0;
  fanSpeed = 0;
  finalVolt = 0;
  delay(100);
  printSpeeds();
  printVoltage();
}


void screenSetup() {
  lcd.setCursor ( 3, 0 );
  lcd.print("Turbofan Stats");
  lcd.setCursor ( 0, 1 );
  lcd.print("Fan Speed:");
  lcd.setCursor (17, 1 );
  lcd.print("RPM");
  lcd.setCursor ( 0, 2 );
  lcd.print("Mtr Speed:");
  lcd.setCursor (17, 2 );
  lcd.print("RPM");
  lcd.setCursor ( 0, 3 );
  lcd.print("Voltage:");
  lcd.setCursor (17, 3 );
  lcd.print("VDC");
}

[/code]

1328×789 38.3 KB

2

I remember this from another forum, apparently you did not get an answer you liked. Great comments in the code, makes it easy to follow. I see no bypass capacitors on your schematic nor do I see the power source connected properly as I stated previously.

3

My driver motor was actually wired properly. I didn’t follow that part of the schematic and had it wired right the first time. I found a short in a wire and after replacing if, I got the dc motor to work. Unfortunately, my main issue now is that the rotary encoder does not have any control over it. As soon as I put 12v on, it goes full blast.

4

Vs is the motor power connection, Vss is the 5V control voltage from the Arduino. Post your latest code.

5

The code in the original message is the latest. I don’t see anything off that would cause the encoder not to work with controlling the dc motor.

6

You’ve no comments in the code , so it’s hard to follow what you are doing .

Are you controlling fan speed ? In which case you probably need a PID controller .

7

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