Example Code for Intel Joule-Servo Control

Sample Code

JS+MRAA config PWM26 for servo, map angle to duty cycle periodically.

var Servo_pin = 26;//Initialize PWM on Digital Pin #26 (D26) and enable the pwm pin
var PWM_period_us = 20000;
var Min_Duty_Cycle = 0.029;
var Max_Duty_Cycle = 0.087;

var mraa = require("mraa"); //require mraa
console.log('MRAA Version: '   mraa.getVersion()); //get the MRAA version
var pwm = new mraa.Pwm(Servo_pin);
pwm.enable(false);
pwm.period_us(PWM_period_us);
pwm.enable(true);

var servoState = true; //Boolean to hold the state of Led

function periodicActivity()
{
  moveServo(servoState?80:100); //move the servo to 80 or 100 degree
  servoState = !servoState;
  setTimeout(periodicActivity,1000);
}

periodicActivity(); //call the periodicActivity function

function moveServo(degree) {
    var processedValue = MapRange(degree,0,180,Min_Duty_Cycle,Max_Duty_Cycle);
    pwm.write(processedValue); //Write duty cycle value.
}

function MapRange (in_vaule, in_min, in_max, out_min, out_max) {
    var output = (in_vaule - in_min) * (out_max - out_min) / (in_max - in_min)   out_min;
    if (output >= out_max) {
        output = out_max;
    } else {
        if (output <= out_min) {
            output = out_min;
        }
    }
    return output
}

Result

Control the Servo through PWM pin 0 to move to 80 or 100 degree.