HELP Arduino flowmeter code

I am using an Arduino UNO interfaced with MATLAB to read a flowmeter using water from the sink. I want to plot the results using MATLAB but I am having trouble with the code.

This are the steps I am using: 1. Connect the flowmeter with the Arduino using a Breadboard and some cables, and the Arduino to the computer through a USB 2. Upload the adioes.pde flie in the Arduino IDE Software 3. Run Matlab code

• Matlab attempts connection with the Arduino but it doesn't recognize the encoderAttach function.

This is the MATLAB code I used:

 function read_Flow2 (cycle)
 global NbTopsFan Calc hallsensor a t;        

   a=arduino('COM5');
  hallsensor =2;
  Calc = (NbTopsFan * 60 / 5.5);      
  passo=1;                       
  t=1;                            

 a.pinMode(hallsensor,'input');  
 a.digitalWrite(hallsensor,0);

 for NbTopsFan=0;

 a.encoderAttach(0,hallsensor);  
 a.encoderRead(0);                
 a.encoderDebounce(0,1);          
 a.encoderDetach(0);              

 end

 while (t<cycle)
   state =a.digitalRead(hallsensor);   
   t=t+passo;
   drawnow;
   plot(t, state); 
   axis([0, cycle, 0, 300]);  
   grid on;
   title('Flow');
   xlabel('Time');
   ylabel('rpm'); 
   pause(1);

 end
delete(a)
clear a
 end

Thank you

[Nazrin Zaini]

so do you have the solution?

[luc]

I use the serial.print interface to connect my sensor loops to matlab. So send using serial.print and receive using:

s1 = serial('COM4');    %define serial port - where the arduino is connected
s1.BaudRate=115200;      %define baud rate - 9600 for old sensor, 115200 for new
fopen(s1);             %open the port
test=fscanf(s1);

Then let matlab loop while u drain data from the arduino that also loops.

Does this help you in any way?

Answer 1

[Gianmaria]

Hi!

Currently i have the same issue. I'm trying to using encoderAttach command with no luck. Here what i get:

>> encoderStatus(a);
Undefined function 'encoderStatus' for input arguments of type 'arduino'

>> encoderAttach(a,0,PIN_A,PIN_B)
Undefined function 'encoderAttach' for input arguments of type 'arduino'

Using methods(a) seems that encoderAttach is not available

>> methods(a)

Methods for class arduino:

addon                i2cdev               spidev               
configureAnalogPin   playTone             writeDigitalPin      
configureDigitalPin  readDigitalPin       writePWMDutyCycle    
details              readVoltage          writePWMVoltage      
disp                 scanI2CBus           
display              servo

What could be the problem?

Thanks

Answer 2

[Sunay Poole]

Hi,

Would you mind providing a link to which MATLAB support package you used? I have the same problem in a way, but with the 'playTone' function. I am currently trying to use the 'playTone' function, but it appears to not exist in the arduino class. When I enter the command 'methods(a)', 'playTone' is not listed, as it is here. I'm not sure if the library that I downloaded with the support package is equipped with this function or not.

Thanks for any help!