Keyestudio Smart Little Turtle Robot V3 Manual page 162

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r_val = digitalRead(sensor_r);//read the value of right line tracking sensor
if(c_val == 1)//if the state of middle one is 1, which means detecting
black line
{
front();//car goes forward
}
else
{
if((l_val == 1)&&(r_val ==
detects black trace
{
left();//car turns left
}
else if((l_val == 0)&&(r_val ==
detects black trace
{
right();//car turns right
}
0))//if only left line tracking sensor
1))///if only right line tracking sensor
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