bgrolleman
11eb2584ef
Arduino Uno + WS2812B LED strip controller with a text-based lightshow system. Shows are defined as .txt files (hex color + fade duration per step), converted to PROGMEM headers by convert_all.py, and navigated at runtime via a debounced button (tap/double-tap/hold). BSD 2-Clause license. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
114 lines
3.6 KiB
Arduino
114 lines
3.6 KiB
Arduino
/*
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* Amirine Cosplay Lights
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*
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* Plays lightshows defined in shows.h on a WS2812B LED strip.
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* A single button navigates between shows:
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* 1 tap — next show
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* 2 taps — previous show
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* hold — reset to show 0 (slow blue pulse)
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*
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* To add or update shows:
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* 1. Add or edit a .txt file in converter/shows/
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* 2. Run: make shows
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* 3. Run: make upload
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*
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* Required library: FastLED (Sketch > Include Library > Manage Libraries)
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "config.h"
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#include "led_controller.h"
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#include "button.h"
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#include "shows.h"
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// Milliseconds between LED updates. 16ms ≈ 60 refreshes/second.
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#define UPDATE_INTERVAL_MS 16
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// ---- Color math --------------------------------------------------------
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// Interpolate a single 8-bit channel from a to b by ratio t (0.0 – 1.0).
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static uint8_t lerp_channel(uint8_t a, uint8_t b, float t) {
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return (uint8_t)(a + (b - a) * t);
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}
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// Blend two colors: t=0.0 returns 'from', t=1.0 returns 'to'.
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static CRGB blend_colors(CRGB from, CRGB to, float t) {
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return CRGB(
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lerp_channel(from.r, to.r, t),
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lerp_channel(from.g, to.g, t),
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lerp_channel(from.b, to.b, t)
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);
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}
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// ---- Playback state ----------------------------------------------------
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static uint8_t s_show_index = 0; // which show is active (index into SHOWS[])
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static ShowDef s_show; // active show, read from PROGMEM once on load
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static uint16_t s_step_index = 0; // current step within the active show
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static uint32_t s_step_start = 0; // millis() when this step began
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static CRGB s_from_color = CRGB::Black; // color at the start of this transition
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// Load show at 'index', resetting playback to the first step.
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static void load_show(uint8_t index) {
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s_show_index = index;
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s_show = read_show_def(&SHOWS[index]);
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s_step_index = 0;
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s_step_start = millis();
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s_from_color = CRGB::Black;
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}
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// How far through the current step we are (0.0 – 1.0).
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// Returns 1.0 immediately for instant steps (duration_ms == 0).
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static float step_progress(const Step& step) {
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if (step.duration_ms == 0) return 1.0f;
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uint32_t elapsed = millis() - s_step_start;
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float t = (float)elapsed / step.duration_ms;
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return (t < 1.0f) ? t : 1.0f;
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}
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// Complete the current step and advance to the next (loops at end of show).
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static void advance_step(CRGB reached_color) {
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s_from_color = reached_color;
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s_step_index = (s_step_index + 1) % s_show.length;
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s_step_start = millis();
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}
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// ---- Arduino entry points ----------------------------------------------
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void setup() {
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leds_begin();
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button_begin(BUTTON_PIN);
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load_show(0); // start on show 0 — slow blue pulse
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}
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void loop() {
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// ---- Button navigation ----
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ButtonEvent evt = button_update();
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if (evt == BTN_TAP) {
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// Next show, wrapping around to 0 after the last one.
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load_show((s_show_index + 1) % SHOW_COUNT);
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}
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if (evt == BTN_DOUBLE_TAP) {
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// Previous show, wrapping around to the last one from show 0.
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load_show((s_show_index + SHOW_COUNT - 1) % SHOW_COUNT);
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}
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if (evt == BTN_HOLD) {
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// Reset to show 0 (blue pulse) from any position.
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load_show(0);
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}
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// ---- Playback ----
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Step step = read_step(&s_show.steps[s_step_index]);
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CRGB to = CRGB(step.r, step.g, step.b);
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float t = step_progress(step);
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leds_apply_color(blend_colors(s_from_color, to, t));
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leds_show();
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if (t >= 1.0f) {
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advance_step(to);
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}
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delay(UPDATE_INTERVAL_MS);
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}
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