Arduino ReadDigitalPin all ones

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almolch 2018-5-4

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https://ww2.mathworks.cn/matlabcentral/answers/399120-arduino-readdigitalpin-all-ones

评论： Walter Roberson 2018-5-4

Hi, I'm trying to connect an arduino to matlab to collect data from the digital pins. I am sending data to pin D3, but when I say readDigitalPin(a,'D3') in matlab it just gives me 1. My code is below, any advice would be appreciated.

if true
  a = arduino('com8', 'uno');
t1 = 0;
dt=[];
dv=[];
tic
for i =1:500
  i;
  tic;
  v = readDigitalPin(a,'D2');
  dT = toc;
  t1 = t1 + dT;
  dt(i) = [t1];
  dv(i) = [v]
  pause(0.5)
end
end

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Walter Roberson 2018-5-4

Have you put an oscilloscope onto the pin to verify that the value goes lower than the threshold at some point, and does so for longer than the hold time of the sampling hardware?

Is D2 configured as a continual read or is it configured as triggered by edge detection? If triggered then what are the reset conditions?

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