Arduino PWM signal from PID controller

I am working on a project using Arduino Leonardo to control the brightness of an LED ring based on the brightness of the environment which is detected by a webcam as a sensor. My end goal is to have 8 independent zones on the ring that control their own brightnesses. However, as a trial this attached code has only 4 zones working. I have attached my matlab file below and I get the following error when I run the code:

"Operands to the || and && operators must be convertible to logical scalar values.

Error in Untitled44 (line 101)

elseif ((0 < PIDGLg(i)) && (PIDGLg(i) < 1)) "

I wanted to know how to convert this to a logical scalar value and also use this similar scalar value in the WritePWMVoltage function for the Arudino.

I am new to MATLAB and would really appreciate the help!!

Answer 1

[Pranav Verma]

Hi Dechao,

In line 102, you are accessing the index using 'i' in PIDGLg after incrementing it. So in the last iteration, the index will go out of bounds. You can try incrementing 'i' (Line 94) at the end of the loop instead.

Thanks

Answer 2

[Daniel Velazquez]

How about doing this PID with Simulink? You would still use the Arduino board

Attached is the example