Thanks for your answer.
First of all, I should point out my specs: I'm running a Windows 7 x64 Professional, Core i7 720QM, 8gb Dual-Channel DDR3, nVidia Quadro FX 880m, Matlab 2012b (Arduino support package installed through MATLAB target installer). Everything is up-to-date.
Here's a walk through of what I'm doing: 1) Start a new model; 2) Insert a Analog Input block (Set pin to 0 and sample time to 0.1); 3) Insert a scope block and connect to the Analog Input block; 4) Set the simulation time to "inf"; 5) Tools > Run on Target Hardware > Prepare to Run...; 6) Set target hardware to Arduino UNO; 7) Set host COM port: to COM5 (tested on the arduino IDE to make sure it's the right port, and it is.); 8) Apply and close prepare to run window; 9) Tools > Run on Target Hardware > Run...; ("Model successfully downloaded to 'Arduino UNO'); (In my understanding the Tx LED on the Arduino should be blinking, but isn't) 10) Run simulate and get nothing but zero's on the scope;
I have checked the circuit, and it works just fine on the Arduino IDE. It must be a detail that I'm missing, but frankly, I have no idea how to make it work.
I thought maybe I could run it on External mode, but I have an Arduino UNO and the external mode only runs on the Arduino MEGA.
I tried running through YouTube and the MATLAB community but I couldn't see a single video or post about someone running a model on the Arduino and viewing the results on simulink.
I kind of managed to make it run, by making one model with Analog input connected to Serial Transmit and download it to the Arduino. Then, on a new block a set a Serial receive block connected to a scope (I also set a Serial Configuration block, both found on the Instrument Control Toolbox) a run a simulation with 'inf'. It kind of works, but very sluggish, and I'm not satisfied with that solution.
Anyway, any help will be greatly appreciated.
To format of the text isn't coming as I wrote it, but I guess you can read it, sorry for that.