ServoOut

A source unit that controls a standard servo-motor.

Servo motors have three wires: power, ground, and signal. The power wire is typically red, and should be connected to the 5V pin on the Arduino board. The ground wire is typically black or brown and should be connected to a ground pin on the Arduino board. The signal pin is typically yellow, orange or white and should be connected to a digital pin on the Arduino board. Note that servos draw considerable power, so if you need to drive more than one or two, you’ll probably need to power them from a separate supply (i.e. not the +5V pin on your Arduino). Be sure to connect the grounds of the Arduino and external power supply together.

Example

Sweeps the shaft of a servo motor back and forth across 180 degrees.

#include <Plaquette.h>
#include <PqServo.h>

// The servo-motor output on pin 9.
ServoOut servo(9);

// Oscillator to make the servo sweep.
SineOsc oscillator(2.0);

void begin() {
  // Position the servo in center.
  servo.center();
}

void step() {
  // Updates the value and send it back as output.
  oscillator >> servo;
}
class ServoOut : public AbstractServoOut

Standard servo-motor (angular).

Public Functions

ServoOut(uint8_t pin = 9)

Constructor for a standard servo-motor.

Parameters:

pin – the pin number

virtual float putAngle(float angle)

Sets the servomotor position to a specific angle between 0 and 180 degrees.

Parameters:

angle – the angle in degrees

Returns:

the current angle

virtual float getAngle()

Return the current angular angle in [0, 180].

inline virtual void center()

Re-centers the servo-motor.

virtual float put(float value)

Pushes value into the unit.

Parameters:

value – the value sent to the unit

Returns:

the new value of the unit

inline uint8_t pin() const

Returns the pin this servomotor is attached to.

inline virtual float get()

Returns value in [0, 1].

See Also