The problem is as follows, The Arduino is powered true its USB connection where the DTR connection is taken out the equation.
This is due that every time under windows8, when a USB device is connected/disconnected, the Arduino would reset.
The Arduino controls two steppers and there is no feedback on their position other than several limit switches.
Both steppers are powered by a power supply and has no connection to the Arduino, the steering interface is true OPTO.
But the problem is that is the main power is interrupted when the steppers should move, the possition in the Arduino would be different from the actual position.
So what i need is a means to tell the Arduino to reset after a power fail.
Any suggestions are welcome.
Harry