GSR_arduino_matlab.m

%% GSR_arduino_matlab
% Galvanic Skin Response - Matlab integration script
% 2021 Knowblesse

%% Setup connection
ard = arduino('COM6','Mega2560'); % COM port must be provided manually!
% and this code should be run no more than once, unless you cleared the
% value.

%% Setup DAQ parameters
fs = 20; % sampling frequency (Hz)
acquisition_points = 100; % number of data points to acquire
verbose = false; % if true, it prints out recording values

%% Setup DAQ
fprintf('Total %d datapoints will be acquired during %.2f minute(s)\n',acquisition_points, 1/fs*acquisition_points/60);
dataset = zeros(acquisition_points, 2); % first column : timepoint, second column : datapoint
fig = figure(1);
clf;
ax = plot(dataset(:,2));

%% Begin Acquisition
tic
for i = 1 : acquisition_points
    dataset(i,2) = readVoltage(ard, 'A0');
    dataset(i,1) = toc;
    ax.YData = dataset(:,2);
    drawnow;
    if verbose, fprintf('%03.2f : %.2f V\n',dataset(i,1), dataset(i,2)), end
    pause(1/fs);
end

%% Redraw data with interpolation
plot(dataset(:,1), dataset(:,2),'Color',[0.5, 0.5, 0.5]);