About

It is NodeMcu and WS2812 LED Strip "hello world" project.

After power on strip shows some different effects in random order:

Each cycle (length of LED strip) changeing fill method.

Fill methods

• rainbow (smooth color change)
• waterfall (random color for each led)
• solid (one random color)

Other random effects

• sometimes runs "dead pixels" (about 1 time for cycle)
• sometimes strip flow revercing

How to use

Setup your LoLin V3 NodeMcu

1. Install drivers for CH340. For macos sierra use this driver
2. Go to https://nodemcu-build.com and build firmware with modules: file, gpio, net, node, timer, uart, wifi, ws2801 You can build firmware with Docker (see above):
3. Flash float version of binary. Crossplatform way (replace port and path to firmware to yours):

pip install esptool
esptool.py --port /dev/tty.wchusbserial1450 write_flash 0x00000 ~/projects/esp8266/nodemcu-firmware/bin/nodemcu_float_master_20161210-1855.bin

Build firmware with Docker

At step 2 from setup NodeMcu, if you build firmwares frequently, more faster way to do it is build you own.

1. Clone nodemcu-firmware:

git clone https://github.com/nodemcu/nodemcu-firmware.git

2. Go to nodemcu-firmware/app/include/user_modules.h and comment/uncomment needed modules
3. Build firmware (replace path to nodemcu-firmware):

docker run --rm -ti -v /Users/popstas/projects/esp8266/nodemcu-firmware:/opt/nodemcu-firmware marcelstoer/nodemcu-build

Firmwares integer and float will be placed at nodemcu-firmware/app/bin, flash float version.

Configure

Ajust some variables at start.lua

Upload files to nodemcu

Easiest way: use ESPlorer, open each file and press "Save to ESP"

Details

Files:

• init.lua - proxy file, need for disable script execution if needed. Just send any data to serial port in first 1 second for stop script.
• start.lua - main file, just includes other scripts.
• color_functions.lua - rgb <--> hsl convert
• ws2812_functions.lua - clean functions for ws2812
• ws2812.lua - led strip scripts