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the drawing and the program list are not the same.
drawing- PWMA connected to D13, program list - PWMA connected to D11.
drawing - PWMB connected to D8, program list - PWMB connected to D10.
after cheking and recheking the wiring .
forward - goes ok.
with an obstacle- right motor - goes forward.
left motor - stops
backwards - never goes.
could the PWNA , PWMB be the reason.
Thank you Jossef
Hi Jossef,

If you are following along with the printed guide for the Inventor's Kit v4.0, there are several known issues covered in our Errata Document including the issue you have noticed with Circuit 5C. The Online Guide has all of these errors fixed so that is the guide we recommend following along with, when possible.