node.js


Raspberry pi 3 + node js controlling ws2811 leds


I am trying to control a string of rgb leds via my raspberry pi. I had this working via an arduino but I would like to do it directly from the pi.
I am using nodejs to do this, and the rpio library. I have connected the leds to the physical pin 19 (SPI - MOSI) and the ground to physical pin 39. Very similar to the arduino set up I had - basically a data and a ground connection. The power goes directly to the lights to take the load off the pi.
My issue is I cannot get the lights to turn on. I've been playing in the node repl trying to get it to work so the code I'm using is very basic:
const rpio = require('rpio');
rpio.spiBegin();
rpio.spiWrite(lights, lights.length);
I suspect its likely due to the lights buffer that I'm sending. Truth is I'm not sure what to send, right now I just populate a list with 50 (thats how many leds i have) 24 bit colors and then just convert it to a buffer with new Buffer(...).
I'm also not sure if my hardware is wired correctly. So any advice on that front also welcome.
If anyone provide a simple code snippet - preferably in nodejs - just so that I can test my lights are connected correctly. That way I can at least narrow down the problem to the software. If anyone has had experience with SPI using rpio any advice would also be helpful.
Pi pinout reference:
https://az835927.vo.msecnd.net/sites/iot/Resources/images/PinMappings/RP2_Pinout.png
The following is not my setup. I'm just using it to show I have 1 connection for 'data', a ground that is connected to pi and to the power supply. And then power straight to the lights (capacitor in that pic). Sorry this was the closest image I could find.
https://i.imgur.com/VP9iB1o.jpg
Ideally im trying to get to something like this:
https://www.youtube.com/watch?v=WLbLOEfoo8s
But I'd settle for 1 light turning on at this point ;)
I'm going to try and get in contact with the uploader aswell.
Let me know if any more info is required.
Any help is appreciated!

Related Links

horizon js can not access rethinkdb in port 28025 without --dev flag . Error : action not permitted
Nodejs - Passport - Failed to serialize user into session
How to access uploaded file from multer?
how to compare column of other table in join sequelize
Which model to put certain fields for a MongoDb schema
NodeJS: How do I enable CHACHA20_POLY1305 in https?
Change the default content of a site if the site is redirected
Is there an htmlentities like for node js?
NodeJS - Why is node reporting wrong version..?
Chrome Devtools with no internet connection
electron - process.env.npm_package* variables missing
Mongoose: only show populated results
Woocommerce API Variable Subscription Product update
Alexa Skill - Keep Intent alive for dialogue
Post to google+ wall from plusDomains api
Nodemailer error connect ECONNREFUSED

Categories

HOME
angular
objective-c
java-ee
dll
sails.js
informix
get
64bit
linuxmint
inform7
apache-apex
vaadin-grid
codeception
crystal-reports-xi
jasperserver
log4net
access-control
corba
logstash-grok
angularjs-ng-route
cllocationmanager
firebreath
amazon-route53
denial-of-service
border
accelerometer
google-login
rinsim
stackdriver
media
google-developers-console
xfce
ctype
edi
biblatex
autoload
maxlength
affiliate
graphic
kafka-python
fread
required
reactive-streams
asp.net-mvc-routing
sharethis
yamldotnet
swiftmailer
rrd4j
google-nearby
lift
instrumentation
case-sensitive
matlab-guide
tinyxml2
jsdoc3
strconv
unicode-string
scodec
audio-player
vibration
leshan
python-wheel
flowgear
mailman
dex2oat
lzma
ratchet
grid-layout
cosmos
stunnel
hottowel
zurb-foundation-5
acl2
openembedded
cpanm
dynamic-ip
compiler-options
facade
jform-designer
android-x86
println
apiaxle
microsoft-search-server
dbase
scite
meteor-slides
fold
jnetpcap
ldapconnection
trusted-timestamp
strtotime
primefaces-extensions
iphone-4
glossary
mobile-phones
endl
ubuntu-9.10
ant4eclipse
multiple-versions
trackback
google-notebook
zero-pad
flashlite

Resources

Encrypt Message



code
soft
python
ios
c
html
jquery
cloud
mobile