If you mount 8 (or 16, 32, whatever is required) flat magnets with opposite polarity outward around the end of the bobbin then when it passes the coil multiple pulses will be produced. A microcontroller can easily identify a stopped bobbin by looking for the missing pulse stream. This can be done with a $1 pic chip. Trying to do it with discrete logic is adding unnecessary expense.
If you need help with the pic code then there are many people here willing to help and in your position you should learn this area of electronics as it will become invaluable.
Mike.
If you need help with the pic code then there are many people here willing to help and in your position you should learn this area of electronics as it will become invaluable.
Mike.