Keyestudio 4DOF Manual page 211

Test Code 9:
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#include <Servo.h> // add the servo libraries
Servo myservo1; // create servo object to control a servo
Servo myservo2;
Servo myservo3;
Servo myservo4;
int pos1=80, pos2=60, pos3=130, pos4=0; // define the variable of 4 servo angle and assign the initial value( that is the boot posture
angle value)
char val;
void setup()
{
// boot posture
myservo1.write(pos1);
delay(1000);
myservo2.write(pos2);
myservo3.write(pos3);
myservo4.write(pos4);
delay(1500);
Serial.begin(9600); // set the baud rate to 9600
}
void loop()
{
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