Servo

Kaluma library to control servo motors. It uses PWM internally, so the servo should be wired to a PWM-capable pin.

Wiring

Here is a wiring example with SG90.

Raspberry Pi Pico	SG90
VBUS	+
GND	-
GP15	IN

Install

npm install https://github.com/niklauslee/servo

Usage

Here is an example:

const {Servo} = require('servo');
const servo = new Servo();

// attach to GP15
servo.attach(15);

// Turn from 0 to 180 by 10 degrees
for (let i = 0; i <= 180; i = i+10) {
  servo.write(i);
  delay(500);
}

API

Class: Servo

new Servo()

Create an instance of Servo class.

attach(pin[, min, max, period])

• pin <number> A pin for control.
• min <number> Pulse width in microseconds for the minimum degree (e.g. 0 angle). Default: 544.
• max <number> Pulse width in microseconds for the maximum degree (e.g. 180 angle). Default: 2400.
• period <number> Period in microseconds. Default: 20000.

Attach the instance to a PWM pin.

If you want to use multiple servo motors, you need to check PWM slices and channels.

detach()

Detach the instance from the PWM pin;

write(angle)

• angle <number>

Move the servo as the angle (0 ~ 180).

read()

• Return <number>

Returns the current angle of the servo (0 ~ 180).