Keyestudio 4DOF Manual page 93

90
Test Code 2:
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#include <Servo.h>
Servo myservo1; // create servo object to control a servo
Servo myservo2;
Servo myservo3;
Servo myservo4;
int pos1=80, pos2=60, pos3=130, pos4=0;
void setup()
{
myservo1.attach(A1); // attaches the servo on pin 9 to the servo object