Keyestudio Smart Little Turtle Robot V3 Manual page 168

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(3) Test Code
/*
keyestudio smart turtle robot
lesson 11
flowing turtle
http://www.keyestudio.com
*/
int left_ctrl = 2;//define the direction control pin of A motor
int left_pwm = 9;//define the speed control pin of A motor
int right_ctrl = 4;//define the direction control pin of B motor
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