Keyestudio EASY PLUG Ultimate Starter Kit Manual page 62

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If a value is true, then return a second value.
For example:
Below is an example code for line tracking car. We use three tracking modules (left to D6, middle to D7,
right to D8). of course you need a tracking car to test it. First edit the forward, backward, turn left, turn
right and stop into functions block. Then compile and upload the code below.