![\"Servo](\"https:\/\/starthardware.org\/en\/wp-content\/uploads\/2019\/10\/servo-motor-setup-300x150.jpg\")
<\/figure><\/div>\n\n\n\nA servo consists of a motor control unit (1), an electric motor (2), a gearbox (3) and a potentiometer for position determination (4). All components are housed in a robust housing.<\/p>\n\n\n\n
The servo motor is connected via a three-pole cable. These are two supply lines (plus and GND) and one data line.<\/p>\n\n\n\n Depending on the manufacturer, the cable colors may differ. Common combinations are brown-red-orange (GND, plus, data) or black-red-yellow (GND, plus, data). A look at the description of the servo motor is always appropriate to make sure that it is properly connected. An incorrect connection can lead to damage here.<\/p>\n\n\n\n The example shows, a standard servomotor connected to the GND, 5V + and digital pin 9. Furthermore, a potentiometer is connected to the analog pin 2.<\/p>\n\n\n\n The program is the Knob example from the Arduino software (File> Examples> Servo> Knob<\/em>).<\/p>\n\n\n\n In this example, the servo motor is controlled to a position determined by the potentiometer at the analog pin 2. Of course, this is just an example to explain how it works. Importantly, the command A servo motor needs a lot of power for the movements. If you want to use more than one servo motor, I recommend using a servo shield like the Adafruit Robot Shield. It is a, on the Arduino attachable, extension of the Arduino. <\/p>\n\n\n\n The Adafruit Robot Servo can control up to 16 servomotors simultaneously. An external power supply is required for this. A pleasant side effect is that you do not occupy valuable channels of the Arduino for each servo motor. The shield is controlled by I2C. This is a digital data connection between the Arduino and the Servo Shield. It occupies only two! pins of the Arduion board.<\/p>\n\n\n\n If you click on this video we will play the video, load scripts on your device, store cookies and collect personal data. This enables [Google Ireland Limited, Irland] to track activities on the Internet and to display advertising in a target group-oriented manner. There is a data transfer to the USA, which does not have EU-compliant data protection. You will find further information here<\/a>.<\/p> To set up this communication, there is a library from Adafruit<\/a> that can be integrated and used in no time at all.<\/p>\n\n\n\n As an alternative to the Adafruit Robot Servo Shield, there is a cheaper version of SunFounder.<\/p>\n\n\n\n Tip: Unfortunately, normal servos do not fit LEGO technology. But with this little 3D model<\/a> it works. Time for a 3D printer<\/a>* \ud83d\ude09<\/p>\n\n\n\n It is a more powerful servomotor, which can rotate not only to 180 \u00b0, but depending on the type to 360 \u00b0 or 720 \u00b0. Winches are used in model making e.g. installed in sailing ships. Here you can view the product<\/a>* on Amazon.<\/p>\n\n\n\n To control the servomotor one uses a signal repeating every 20 milliseconds. It consists of a HIGH pulse, which is between 1 and 2 milliseconds long, and a LOW pulse. The duration of the HIGH pulse determines the target angle (normally from 0 to 180 \u00b0). In the Arduino software, the delayMicroseconds (x); use:<\/p>\n\n\n\n Since the servo takes some time to adjust to the desired target angle, the signal must be repeated at least until the servo has reached the position.<\/p>\n\n\n\n Servo motors check their own adjustment angle with a built-in potentiometer. It happens here that a desired position can not be reached exactly. The servo will then self-correct, causing the servo to “shake”. To prevent this, the pulse should be switched to LOW after reaching the target angle.<\/p>\n\n\n\n![\"Arduino](\"https:\/\/starthardware.org\/en\/wp-content\/uploads\/2019\/10\/arduino-servo-motor-circuit-1024x370.jpg\")
Circuit and sample program code<\/h2>\n\n\n\n
#include <Servo.h>\n\nServo myservo;\n\nint potpin = 0;\nint val;\n\nvoid setup() {\n myservo.attach(9);\n}\n\nvoid loop() {\n val = analogRead(potpin);\n val = map(val, 0, 1023, 0, 180);\n myservo.write(val);\n delay(15);\n}<\/code><\/pre>\n\n\n\nmyservo.write (val); <\/code>sets the servomotor in a specific position between 0 and 180 degrees.<\/p>\n\n\n\nControl many servo motors with Arduino<\/h2>\n\n\n\n
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We need your consent to load the content of YouTube.<\/div> ![\"Arduino](\"https:\/\/starthardware.org\/en\/wp-content\/uploads\/2019\/10\/arduino-servo-lego-holder-3d-printed.jpg\")
<\/figure>\n\n\n\nSpecial form servo winch<\/h2>\n\n\n\n
Expert knowledge: Control without library<\/h2>\n\n\n\n
digital write (myServo, HIGH);\ndelay microseconds (1500);\ndigital write (myServo, LOW);\ndelay microseconds (18500);<\/code><\/pre>\n\n\n\n