Plotting force sensor data from Arduino in matlab

Question

Inti Vanmechelen 2017-3-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/330383-plotting-force-sensor-data-from-arduino-in-matlab

Hi,

I'm trying to plot live data from a force sensor resistor in matlab using an arduino. I'm using the code I found on mathworks, but I cannot figure out how to adapt it correctly for it to read voltage data.

I need the command a=arduino; b = readVoltage(a,'A0');

But than I'm struggling with the fread function, since the fread function should than read the voltage, but this gives me the error 'In an assignment A(:) = B, the number of elements in A and B must be the same'

when I put data(i) = fread(b);

s = serial('COM3');

s.InputBufferSize = 1; % read only one byte every time

try

fopen(s);

catch err

    fclose(instrfind);
    error('Make sure you select the correct COM Port where the Arduino is connected.');

end

%% Create a figure window to monitor the live data

Tmax = 1000; % Total time for data collection (s) figure,

grid on,

xlabel ('Time (s)'), ylabel('Voltage'),

axis([0 Tmax+1 0 200]),

%% Read and plot the data from Arduino

Ts = 1; % Sampling time (s)

i = 0;

data = 0;

t = 0;

tic % Start timer

while toc <= Tmax

    i = i + 1;
    %%Read buffer data
    data(i) = fread(s);
    %%Read time stamp
    % If reading faster than sampling rate, force sampling time.
    % If reading slower than sampling rate, nothing can be done. Consider decreasing the set sampling time Ts
    t(i) = toc;
    if i > 1
        T = toc - t(i-1);
        while T < Ts
            T = toc - t(i-1);
        end
    end
    t(i) = toc;
    %%Plot live data
    if i > 1
        line([t(i-1) t(i)],[data(i-1) data(i)])
        drawnow
    end