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How I think I will make a automatic door is to have a ultrasonic sensor on the top. The NXT brick will have a calibrate function in the beginning of the program to calibrate the ultrasonic sensor value. Then if the ultrasonic's sensor value changes, open the door and leave it open for 5 seconds after the value goes to normal. Then repeate.
I just need to base structure...
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sounds fun - once that's working, you should make it so that it saves the last calibrated value to a file.
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