Artnet, WS2812 and ESP8266 (Lua)

From my previous post on Artnet ESP8266, I had some feedback about some trouble. I decided to make it again but with the WS2812.

• Flash the ESP8266 with the correct library. You will need:
  • Nodemcu flasher
  • Esplorer
  • Compile a new firmware using: Nodemcu Custom Builds

Once compiled you will receive an email with a link to download the firmware.

Upload the firmware with Nodemcu flasher and change the path to point to the custom firmware

With Esplorer, upload this program:

wifi.setmode(wifi.STATION)
wifi.sta.config("*****","*****",1)
tmr.delay(5000000)   -- wait 1,000,000 us = 1 second
print(wifi.sta.getip())
print("Running")
gpio.mode(4, gpio.OUTPUT)
ws2812.init()
tmr.delay(1000000)
ws2812.write(string.char(0,0,0):rep(100))
s=net.createServer(net.UDP)
s:on("receive",function(s,c) ws2812.write(string.sub (c, 19, 318)) end)
s:listen(6454)

I am driving a Matrix (10*10) of 100 pixels.

In the UDP loop, I am extracting the 300 bytes (19 to 318) corresponding to each RGB values of each pixels; 3 * 100. Bytes 1 to 18 are the Artnet header.

The led stripe is connected to PIN D4 of my NODEMCU Board

Forgot to mention that a fast wifi router is needed.

Enjoy…