Ploting DC Motor speed versus time from arduino to matlab

Using Arduino Microcontrollers
#1

Hello

Would like to ask experts if they know how can i plot real time graph of the PID (Speed Versus Time) of the DC Motor from Serial Monitor of the Arduino to the MATLAB ?

This is my arduino code:

/********************************************************

  • PID Basic Example
  • Reading analog input 0 to control analog PWM output 3
    ********************************************************/

#include <PID_v1.h>

#define PIN_OUTPUT 11
double SPEED();
//Define Variables we’ll be connecting to
double Setpoint, Input, Output;

//Specify the links and initial tuning parameters
double Kp=1, Ki=2, Kd=0.00001;
PID myPID(&Input, &Output, &Setpoint, Kp, Ki, Kd, REVERSE);

void setup()
{
//initialize the variables we’re linked to
Serial.begin(9600);
Input = 0;
Setpoint = 120;
pinMode(PIN_OUTPUT, OUTPUT); //PWM PIN 10 with white line
pinMode(9, OUTPUT);//direction control PIN 11 with blue line
//turn the PID on
myPID.SetMode(AUTOMATIC);
}

void loop()
{
Input = SPEED();
myPID.Compute();
analogWrite(PIN_OUTPUT, Output);
Serial.println("");
Serial.print(“Speed:”);
Serial.println(Input);
Serial.print(“PWM:”);
Serial.println(Output);
Serial.println("");
//delay(500);
}

double SPEED()
{
int i = 0;
for(int j = 0;j<8;j++)
{
i += pulseIn(10, HIGH, 500000); //SIGNAL OUTPUT PIN 9 with white line,cycle = 2i,1s = 1000000us，Signal cycle pulse number：272
}
i = i >> 3;

double x = 111111 / i;

if (x>160.0)
{x = 0;}
else
;
return x;
}

Thanks

#2

anyone ?

#3

If Matlab can read serial data I don’t see why it shouldn’t be possible. If this is a Matlab question I suggest you’re asking at the Matlab forum instead :wink: Your code seems just fine

#4