Keyestudio Smart Little Turtle Robot V3 Manual page 174

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The specific logic of ultrasonic avoiding smart car is shown below:
measured distance
of front obstacle
set servo to90°
measured distance
Detection of left obstacle（set
servo to 180°）
measured distance
of right obstacle
（set servo to 0°）
set the initial angle of servo to 90°
Setting
Dot matrix shows smile face pattern
Condition1 Status
Stop for 1000ms；set the angle of servo to 180°，
read a1，delay in 500ms；set the angle of servo to
0°，read a2，delay in 500ms
a＜10
Condition 2
a1＞a2
a（unit：cm）
a1（unit：cm）
a2（unit：cm）
Status
Set the angle of servo to 90°，
rotate to left for 400ms (set
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