Be careful! When you switch you Simulink code from Matlab 2015a to Matlab 2015b for your Arduino, you MUST buy a new license…. Fixed-Point Designer license Impossible to compile and upload the Simulink code in the Arduino board when you use bloc like I2C. It is a Mathworks scam? and we must pay 3000 € to continue to use Simulink for our Arduino ? Or you have found another solution?