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| In NXT-G, how can I write a program to command a 2-motor car to drive straight until it reaches a black line? |
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One way to program an NXT car to stop on a black line is to use the switch block to constantly check the light sensor for darkness.
In this program, a switch block tells the NXT to constantly check the input from the light sensor. As long as it senses light, motors B and C drive the car forward. When the light sensor senses a darker value (presumably from the black line on the floor), motors B and C stop and the NXT plays a sound.
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