I created a “festival totem” prototype project and posted the code to github: https://github.com/firxworx/arduino-fastled-totem. The project is implemented with an Arduino Nano, WS2812B “Neopixels”, and the FastLED library.
The project consists of 6x LED strips that are each 11-pixels in length. They are wired together and hot-glued vertically around the diameter of the end of a bamboo shaft in an up-down-up-down-up-down pattern.
The primary effect is a “fire torch” that features a modified version of the Fire2012 animation by Mark Kriegsman.
The project implements handful of other effects that can be switched to using a button that’s implemented with an interrupt on Pin D2 of the Arduino. Most of them are sourced from the FastLED demo reel and modified as necessary for the totem.
compute_bottom_to_top_offset() in the code is used to compute the index of a given pixel on a given strip (of the 6) such that the pattern moves from bottom-to-top. This is used to replicate an effect on one strip across all of the strips.
The project is powered by a stock 5V battery charger and the NeoPixels are powered via the Arduino Nano’s 5V pin. Since this pin is limited to 500mA of output, the FastLED function
set_max_power_in_volts_and_milliamps() limits power consumption.
The project ran successfully without issues at Harvest Festival 2019 in Ontario. It would be a great candidate to ruggedize and bring to Burning Man.
Check out the project on Github for the code and a description of the hardware/schematic.