can someone guide me what i m doing wrong in sending array to arduino I have to use this array further to make logic..

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Bushra Ali 2018-5-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/400395-can-someone-guide-me-what-i-m-doing-wrong-in-sending-array-to-arduino-i-have-to-use-this-array-furth

评论： Ameer Hamza 2018-5-12

采纳的回答： Ameer Hamza

在 MATLAB Online 中打开

MATLAB code is here

 > a=4:8
if ~isempty(instrfind)
fclose(instrfind)
delete(instrfind)
end
s=serial('COM3','BaudRate',9600);
fopen(s);
for f=1:5
fprintf(arduino,a(1,f)); 
pause(1)
end

arduino code is

         int data[5]={0,0,0,0,0};
const int RelayPin1=13;
const int RelayPin2=3;
const int RelayPin3=4;
const int RelayPin4=5;
const int RelayPressure=6;

void setup() { Serial.begin(9600); pinMode(2,OUTPUT); pinMode(3,OUTPUT); pinMode(4,OUTPUT); pinMode(5,OUTPUT);

pinMode(6,OUTPUT); }

void loop() { if(Serial.available()>0) { for (int i=0; i<8; i++) { data[i]=Serial.read(); // read data }

             if(data[0]<2)
             {digitalWrite (RelayPin1,LOW); }
             if(data[0]>2)
             {digitalWrite (RelayPin1,HIGH);
             delay (5000);
             }
             if(data[1]<2)
             {digitalWrite (RelayPin2,LOW); }
             if(data[1]>2)
             {digitalWrite (RelayPin2,HIGH); 
             delay(5000);}
             if(data[2]<2)
             {digitalWrite (RelayPin3,LOW); }
             if(data[2]>2)
             {digitalWrite (RelayPin3,HIGH); 
             delay(5000);}
             if(data[3]<2)
             {digitalWrite (RelayPin4,LOW); }
             if(data[3]>2)
             {digitalWrite (RelayPin4,HIGH);
             delay(5000);}
             if(data[4]>2 && data[4]<8)
             { digitalWrite (RelayPressure,LOW);}
             if(data[4]>8)
             { digitalWrite (RelayPressure,HIGH);
             delay(5000);}
       }
     if (Serial.available()<0)
     {
      digitalWrite (RelayPin1,LOW);
      digitalWrite (RelayPin2,LOW);
      digitalWrite (RelayPin3,LOW);
      digitalWrite (RelayPin4,LOW);
      digitalWrite (RelayPressure,LOW);
      digitalWrite(LED_BUILTIN,LOW);
      }
}

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Ameer Hamza 2018-5-12

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/400395-can-someone-guide-me-what-i-m-doing-wrong-in-sending-array-to-arduino-i-have-to-use-this-array-furth#answer_319903

编辑：Ameer Hamza 2018-5-12

在 MATLAB Online 中打开

Use fwrite() to the data as bytes over the serial port

fwrite(s, a(1,f));

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Ameer Hamza 2018-5-12

在 MATLAB Online 中打开

Since I don't have your hardware, it is hard to debug, but there are few comments which might help.

1) In your MATLAB code, you are giving a pause of 1 second between writes, why do you need that? Try to remove it.

2) In your Arduino code you have

if(Serial.available()>0)

but in reality you are expecting 5 values, so try to change it like this

if(Serial.available()>=5)

3) Try to add Serial.print() debugging statements in your Arduino code. If I was trying to debug, I will print back all the values after reading to confirm that Arduino read them correctly e.g.

// your code
for(int i=1;i<6;i++)
{ 
  matlabData[i]=Serial.read();
}
// I would add this, to echo back the data
 for(int i=1;i<6;i++)
{ 
  Serial.println(matlabData[i]);
}

also, you mentioned pins 5 and 6 remain low, so I will add few debugging lines to see if Arduino enter the if block. For example

if(g4>2)
{
  Serial.println("I can reach here");
  digitalWrite(R4,HIGH);delay(5000);
}

Now to read the values send back by Arduino, you will need few extra steps, initialize serial port with a large input buffer,

s=serial('COM3','BaudRate',9600, 'InputBufferSize', 1024*1024);
% 1 megabyte of buffer

and read the value returned by Arduino like this

char(fread(s, s.BytesAvailable)')

this will show what Arduino is sending back at serial port.

Ameer Hamza 2018-5-12

@Bushra's comment moved here:

can u brief me about how arduino stores the array? I m confused in it .. it seems like the data i m sending isnt storing the way i want to

Ameer Hamza 2018-5-12

在 MATLAB Online 中打开

The Arduino store array quite similar to MATLAB except that you need to specifically declare the type of array ( int in your case). I suggest you start from a basic program in which you send and read data from Arduino IDE. The Arduino will just look at incoming byte and send it back. For example, declare your loop like this

void loop() {
  if(Serial.available()) {
    Serial.print(Serial.read());
  }
}

if this program works, this can give you some idea for the problem.

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