Matlab error when reading analogVoltage from Arduino "The first input must contain a multiple of 2 elements to convert from uint8 (8 bits) to uint16 (16 bits)."

Hello,

I would like to control the position of a linear motor by reading the output from a linear potentiometer connected to it using the Matlab GUI.

I am sending the signal to run the motor until a certain value of voltage is received by Matlab, however when I run the code I get the following error:

"The first input must contain a multiple of 2 elements to convert from uint8 (8 bits) to uint16 (16 bits)."

Does anyone know how to get rid of this error?

my code looks like this

%FORWARD
b = readVoltage(a,'A2')
while b > 0.57
writePWMVoltage(a,'D3',5);
writeDigitalPin(a,'D12',1);
writeDigitalPin(a,'D9',0);

if b < 0.56
    break
end
end

[Tim Darrah]

I also started getting this error when calling readVoltage from a function, then I just cleared the arduino object and it worked again. weird.

Answer 1

[Lipi Vora]

Hi, what exact line are you getting the error at? Also, I understand that you are reading voltage from a potentiometer and then writing to the motor pins, is that correct?

[D S]

Hi! the error always pop up at the line where I am reading the signal voltage output of the potentiometer 'A2' port.

Yes that is correct.

[Lipi Vora]

Could you provide details of the Arduino model that you are using?

[Oliver Shorthose]

Hi, I get this issue as well but using an AnalogInput block on Simulink. When I run the model as it is, it works fine and the model works. However, when I use that model inside another model I get the response '

• The first input must contain a multiple of 2 elements to convert from uint8 (8 bits) to uint16 (16 bits). '

The Arduino is attached to a pneumatic chamber to be inflated/deflated accordingly. Why might it be that it fails when called from the parent?

Parent use of the model:

The error: