After you upload the program, the RGB LEDs on the RGB module connected to pin A13 on MegaPi are on when the line follower sensor connected to pin A9 detects a black line and the RGB LEDs are off when the line follower sensor does not detect a black line.

Part 2 Preparation
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MegaPi x 1
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RGB module x 1
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Line follower sensor x 1
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3-pin jumper x 2
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USB cable x 1
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Computer with network access x 1
Connect MegaPi to the computer by using the cable, connect the line follower sensor and the RGB module to MegaPi respectively by using the jumpers, open mBlock 5 (PC client or web version), click +add, select mBot Mega from the Device Library, click Connect, and select the Upload mode.


Part 3 Programming
When the line follower sensor detects a black line, the RGB LEDs are on. Otherwise, the RGB LEDs are off.
Part 4 Practice
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Try to write a program by which the RGB LEDs are off when the line follower sensor detects a black line and the RGB LEDs are on when the line follower sensor does not detect a black line.
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When you turn on mBot Mega, the number of RGB LEDs lighting up equals the number of times the line follower sensor detects a black line.
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