This is a learning project to get to know the usage of an ESP32 with Rust and the control of a WS2812 type LED strip with individually accessible LEDs.

See setup-steps.txt to look for the dev environment setup. Steps might vary between different operating systems.

I generally used the following links for starters:

• Rust on ESP book
• ESP32 documentation

Using the esp-hal crate, the access of things like the RMT to send out data via a GPIO are pretty straight forward. The LED strip expects the data for all LEDs to be sent out in a certain order (highest bit first; order green, blue, red) and consumes the RGB data down the strip. More information be found in the official documentation.

This post helped me to get the timings to encode single bits right.

Connect your ESP32 via the USB port to your PC and make sure serial to USB driver and other tools mentioned in setup-steps.txt are installed. Execute cargo run to compile and upload the binary to the controller. If no connection can be made, press the BOOT button on the ESP for a second or two while the console says "Connecting...".

For some examples, buttons or other devices must be connected to the controller at specific GPIO ports. Read the comments or commit messages for more info about that.

The program offers an API via BLE to change patterns and other parameters at runtime. Using an app like "Bluetooth Commander" on Android enables connecting to the BLE endpoint offered by the ESP32 and sending text commands. More docs on the API schema are following.

General features:

• LED strip RGB encoding
• Sound reaction
• [-] Wi-Fi setup
• [-] Socket for requests
• Beat setting via button
• Partition LEDs into groups with different patterns
• Use observer pattern for beat for animations
• BLE setup
• Define command strategy for BLE
• Internal beat counting system for better e.g. 2x / 0.5x speed changes
• Define color palettes (primary, secondary, tertiary)

Patterns:

• Classic Breathing (random colors)
• Individual breathing
• Shooting Stars
• Sliding Rainbow
• Strobe
• Strobe to beat
• Filters (e.g. alpha modifiers, sepia)
• Background pattern (combination with other pattern)
• Caterpillar
• Bounce between walls