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Yes, I want put the program into the arduino card of a kind of little car

Thank you for your response but I try to put delays at different places ( 5ms ) but the problem stay the same. For example, when the program starts PWM 1 and 3 are activated but when I switch on the left captor ( the left switch on the
2D pannel ) the Pwm 2 and 3 are activated but the third PWM ...

Have to create for a exam a program to allow to a robot to follow a lines. For this program, I used 4 PWM which works by pair for the four wheels. Only, while I try to simulate the program, I have an "impossible" configuration where I have 3 PWM activated. Also, I can't disactivated PWM blocks when ...