No appropriate method, property, or field 'pinMode' for class 'arduino'.

Hello,

I make a project with arduino and matlab. I have connected everything, now I try to write arduino code in matlab. if I print on run, this following announcement always comes out:

No appropriate method, property, or field 'pinMode' for class 'arduino'.

can somebody help please me?

thanks

thus matlab code looks:

a = arduino('COM12', 'uno');

clkPin=2;
dtPin=3;
swPin=4;

a.pinMode(2,'input')
a.pinMode(3,'input');
a.pinMode(4,'input');
a.digitalWrite(4,1);

oldA = 1;
oldB = 1;
result = 0;
encoderVal = 0;

newA = a.digitalRead(clkPin);
newB = a.digitalRead(dtPin);
if (newA ~= oldA) | (newB ~= oldB) 

      if (oldA == 1 & newA == 0)
        result = (oldB * 2 - 1);
      end
  end

oldA = newA;
oldB = newB;

change = result;
encoderVal = encoderVal + change;
if digitalRead(swPin) == 0
    encoderVal = 0;
end
Serial.println(encoderVal);

i use matlab R2016a

[homam mohamad alramadan]

i have the same problem i am trying to communicate arduino ith matlab gui and the error appears in the last line

delete(instrfind({'Port'},{'COM5'}))
clear a;
global a;
a=arduino('COM5');
a.pinMode(8,'output');

[Walter Roberson]

homam mohamad alramadan: which MATLAB release are you using?

Answer 1

[Walter Roberson]

pinmode is the older "legacy" interface. It has been replaced. See https://www.mathworks.com/help/supportpkg/arduinoio/ref/configurepin.html and readDigitalPin and readVoltage and writeDigitalPin

[Fredy Aldo Tsangue Jiatsa]

Hello Walter Roberson, thanks for your help. now everything is OK. But I have the new following error message:

Undefined variable "Serial" or class "Serial. println". 
Error in Lol (line 40) 
Serial. println (encoderVal);

Thus my new matlab code looks:

clear all; close all; clc
a = arduino('COM12', 'uno');

clkPin=2;
dtPin=3;
swPin=4;

configurePin(a,'D2')
configurePin(a,'D3');
configurePin(a,'D4');
writeDigitalPin(a,'D4',1);

oldA = 1;
oldB = 1;
result = 0;
encoderVal = 0;

newA = readDigitalPin(a,'D2');
newB = readDigitalPin(a,'D3');
if (newA ~= oldA) | (newB ~= oldB)
    if (oldA == 1 & newA == 0)
      result = (oldB * 2 - 1);
    end
end

oldA = newA;
oldB = newB;

change = result;
encoderVal = encoderVal + change;
if configurePin(a,'D4') == 0

      encoderVal = 0;
  end
  Serial.println(encoderVal);

[Walter Roberson]

The Serial class is for C++ on the Arduino side. On the MATLAB side, if you want to display to the screen, you can disp() the value. If you want to send to the Arduino as text you would need to fprintf(a, '%d\n', encoderVal) or similar.

[Fredy Aldo Tsangue Jiatsa]

Hello Walter Roberson,

I thank you once more.

I have one more question. I have written with arduino code thus:

static int oldA = HIGH; 
static int oldB = HIGH;

Now I want to circumscribe in Matlab code.

Can you help me please over again?

Thanks. . .

[Walter Roberson]

persistent oldA oldB
oldA = int32(HIGH);
oldB = int32(HIGH);

[Fredy Aldo Tsangue Jiatsa]

Hello Walter Roberson,

this is the complete arduino code:

const int clkPin= 2;
const int dtPin= 3;
const int swPin= 4 ;

int encoderVal = 0;

void setup()
{
  pinMode(clkPin, INPUT);
  pinMode(dtPin, INPUT);
  pinMode(swPin, INPUT);
  digitalWrite(swPin, HIGH);
  Serial.begin(9600);

}

void loop()
{

    int change = getEncoderTurn();
    encoderVal = encoderVal + change;
    if(digitalRead(swPin) == LOW)
    {
      encoderVal = 0;
    }
      Serial.println(encoderVal);
  }

int getEncoderTurn(void)
{
  static int oldA = HIGH;
  static int oldB = HIGH;
  int result = 0;
  int newA = digitalRead(clkPin);
  int newB = digitalRead(dtPin);
  if (newA != oldA || newB != oldB)
  {
    if (oldA == HIGH && newA == LOW)
    {
      result = (oldB * 2 - 1);
    }
  }

    oldA = newA;
    oldB = newB;
    return result;
  }

This arduino code is for encoder. if I turn encoder, it counts pay high and if I turn in other direction, it counts pay under it. now I would like to circumscribe this arduino code in Matlab code and this is what I have written:

clear all; close all; clc

a = arduino('COM12', 'uno');
configurePin(a,'D2','DigitalInput');
configurePin(a,'D3','DigitalInput');
configurePin(a,'D4','Unset');
writeDigitalPin(a,'D4',1);

encoderVal = 0;

while 1

      oldA = 1;
      oldB = 1;
      result = 0;

      newA = readDigitalPin(a,'D2');
      newB = readDigitalPin(a,'D3');

      if (newA ~= oldA) || (newB ~= oldB) 
          if (oldA == 1 && newA == 0)
             result = (oldB * 2 - 1);
          end
      end

      oldA = newA;
      oldB = newB;
      change = result;

      encoderVal = encoderVal + change

end

but it does not work and I do not know what I make wrong or how I should continue. Please, can you help me?

I thank you for her understanding.

Thanks

[Walter Roberson]

Move

      oldA = 1;
      oldB = 1;

to before the while loop.

[Fredy Aldo Tsangue Jiatsa]

Hello Walter Roberson, thank you one more time for your reponse. I have made as you have said me, but it does not function so properly. when i turn to encode the opposite sense of the needle of a watch to have numbers negative, i gets numbers rather positive. when I write Befehl a = arduino (' COM12 ', ' Uno '); to assure me that there is a communication between Matlab and the board Arduino, i get the following text: Failed to open serial harbour COM12 to communicate with board Uno. Make sure there simple percentage no other MATLAB ARDUINO OBJECT FOR this board. For troubleshooting, see Arduino Hardware Troubleshooting. I do not know if it is because of it that I do not get numbers negative to encode it. Please are you possible to help me. thank you

[Walter Roberson]

Try

delete(instrfind())

to get rid of any lingering connections.

[Fredy Aldo Tsangue Jiatsa]

Hello Walter Roberson,

when I run the programme by putting delete (instrfind ()) at this level:

clear all; close all; clc

a = arduino('COM12', 'uno');

delete(instrfind())

configurePin(a,'D2','DigitalInput');

configurePin(a,'D3','DigitalInput');

configurePin(a,'D4','Unset');

writeDigitalPin(a,'D4',1);

encoderVal = 0;

oldA = 1;

oldB = 1;

while 1

        result = 0;
        newA = readDigitalPin(a,'D2');
        newB = readDigitalPin(a,'D3');
        if (newA ~= oldA) || (newB ~= oldB) 
            if (oldA == 1 && newA == 0)
               result = (oldB * 2 - 1);
            end
        end
        oldA = newA;
        oldB = newB;
        change = result;
        encoderVal = encoderVal + change
  end

I get the text suivant:

Error using to Encode (line 4) 
Instrument object OBJ simple percentage year invalid object.

but when I put delete (instrfind ()) at the end of the programme:

clear all; close all; clc
a = arduino('COM12', 'uno');
configurePin(a,'D2','DigitalInput');
configurePin(a,'D3','DigitalInput');
configurePin(a,'D4','Unset');
writeDigitalPin(a,'D4',1);
encoderVal = 0;

oldA = 1;
oldB = 1;

while 1

        result = 0;
        newA = readDigitalPin(a,'D2');
        newB = readDigitalPin(a,'D3');
        if (newA ~= oldA) || (newB ~= oldB) 
            if (oldA == 1 && newA == 0)
               result = (oldB * 2 - 1);
            end
        end
        oldA = newA;
        oldB = newB;
        change = result;
        encoderVal = encoderVal + change
  end
  delete(instrfind())

I still do not get numbers negative. I always get numbers positive, all the same which direction of encoder I turn .

where exactly in the programme I must delete(instrfind()) write?

good day to you and thank you.