Hey all,
First off, hi to everyone - First time on this forum.
Ok, I am building a robot and I have a slight problem.
I have a LEGO NXT brick and on the brick there are motor ports. The ports allow for a motor to be connected and rotated cw or ccw. Obvioulsy the built in circuit allows for the polarity swap somehow.
I also have an external power source and a motor. What I want to do, is control the motor but the motor is connected to the external power source. This way I save energy being used up on my NXT brick.
How can I configure a setup so that when the polarity from the NXT motor port changes, the power supplied to the motor from the external source is of the same polarity? I also need to have an "off" state.
I have drawn up a little diagram for some visual aid.
Rich.
**broken link removed**