Keyestudio Smart Little Turtle Robot V3 Manual page 157

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(2) Program Process：
Middle tracking sensor
Detection Left tracking sensor
Right tracking sensor
Condition Status 2
1 right tracking sensor
left tracking sensor detects black
Middle
line; right sensor detects white line
tracking
sensor
detects
left tracking sensor detects white
black line
line; right sensor detects black line
detecting the left and the
detects black line：
HIGH
detects white line：
LOW
detects black line：HIGH
detects white line：
LOW
detects black line：
HIGH
detects white line：
LOW
Status
Rotate to left
（ Set PWM
200）
Rotate to right
（ Set PWM to
200）
to
157