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90 degrees gyro: which sensor to do it with arduino? Answered

I would like to make the movement attached in the picture with a vehicle powered by two dc motors on the wheels. I need to sense the angle from starting position and stop the motors when it has reached 90 degrees. Any ideas and which sensor to use? I will use Arduino Thank you!!

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Use a magnetic compass chip

Put a rotation sensor on each wheel and count the rotations.

Thank yoy rickharris. It is a good idea but it could slide while rotating. I need something to measure angles