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Note: "-"、 "+" and "S" pins of servo are respectively attached
to G （GND） , V （VCC） and D9 of expansion board. The VCC, Trig, Echo
and Gnd of ultrasonic sensor are linked with 5v(V), 5(S), Echo and
Gnd(G) of expansion board.
(4) Test Code:
/*
keyestudio Mini Tank Robot v2.0
lesson 11
ultrasonic_avoid_tank
http://www.keyestudio.com
*/
int random2;
int a;
int a1;
int a2;
#define ML_Ctrl 13 //define the direction control pin of left motor
#define ML_PWM 11
#define MR_Ctrl 12
motor
#define MR_PWM 3
//define PWM control pin of left motor
//define the direction control pin of right
//define PWM control pin of right motor
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