Keyestudio Smart Little Turtle Robot V3 Manual page 81

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After knowing its working principle, connect an LED to D3. We could
control LED by line tracking sensor.
Test Code
/*
keyestudio smart turtle robot
lesson 3.2
Line Track sensor
http://www.keyestudio.com
*/
int L_pin = 6; //pins of left line tracking sensor
int M_pin = 7; //pins of middle line tracking sensor
int R_pin = 8; //pins of right line tracking sensor
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