npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

bbservos

v0.0.1

Published

BeagleBone servo control using built in PWM timers

Downloads

8

Readme

node-bb-servos

This module allows you to take control of the two Enhanced High Resolution (EHR) Pulse Width Modulation (PWM) pins on the Beaglebone for the purpose of controlling standard RC servos. These PWM signals are broken out on the P9 connector as pin 31 (ehrpwm0A) and pin 29 (ehrpwm0B). This module generates a 50Hz PWM signal and allows you to specify the pulse time in microseconds. When the module is instansiated the default pulse time is 1500us which corresponds to a center position for a standard servo. By varying this pulse time in the range of 1000-2000us the position of the servo can be changed. NOTE: this module does not prevent you selecting PWM pulses outside of the normal 1000-2000us range as this may be useful for some applications (many servos feature an extended range), be careful what values you set as your servos may be damaged!

See here for some background information on taking control of these PWM pins

Installation

Install the module with

npm install bbservos

Usage

The main.js file provides some basic useage information

var bbServos = require("./src/bbservos");

//create an instance of bbServos, arguments are whether to enable pin A and pin B respectively
var myServos = new bbServos(true, true);

var pwm1 = 1500;
var step1 = 1;
setInterval(function() {
	//reverse direction when limits reached
	if (pwm1 < 1050 || pwm1 > 1900) {
		step1 = -step1;
	}
	pwm1 += step1;
	myServos.setPWM("A", pwm1);
	
}, 2);

var pwm2 = 1500;
var step2 = 2;
setInterval(function() {
	//reverse direction when limits reached
	if (pwm2 < 800 || pwm2 > 2200) {
		step2 = -step2;
	}
	pwm2 += step2;
	myServos.setPWM("B", pwm2);
	
}, 2);