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

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Fredy  Aldo Tsangue Jiatsa
Fredy Aldo Tsangue Jiatsa on 26 Sep 2016
Commented: Walter Roberson on 20 Jul 2017
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
  2 Comments

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Answers (1)

Walter Roberson
Walter Roberson on 26 Sep 2016
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
  9 Comments
Fredy  Aldo Tsangue Jiatsa
Fredy Aldo Tsangue Jiatsa on 27 Oct 2016
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.

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