01 · Brief
The subspace beacon wall mount is both a signal and a receiver. A person can set their status proactively, or the status can be set remotely to get someone’s attention. That second part is how it is normally used. The 24-LED ring shows that room’s beacon state exactly as the dashboard draws it: available, busy, away, alert. Turning the encoder previews a state and pressing it commits the change to the server, which pushes it to every terminal and every other lamp over one event stream. A separate button toggles the light locally without touching state.
Only one fully flashed, printed, installed, and in use. More planned.
02 · System
03 · Source
subspace_lamp.ino
// Encoder: enter/extend select mode.
int detents = takeDetents();
if (detents != 0) {
if (!selecting) {
selecting = true;
candidate = liveState;
}
candidate = ((candidate + detents) % NUM_STATES + NUM_STATES) % NUM_STATES;
selectStart = millis();
DBG("preview: %s\n", STATE_NAMES[candidate]);
}
if (selecting && millis() - selectStart >= SELECT_TIMEOUT_MS) selecting = false;
// Encoder press: commit the previewed state.
if (pressed(PIN_ENC_SW, swEdge, swLevel) && selecting) {
selecting = false;
commitState(candidate);
liveState = candidate; // optimistic; heartbeat reconciles within 5s
displayOn = true;
DBG("committed: %s\n", STATE_NAMES[candidate]);
}04 · Lessons
330 ohms on the ring data line and 1000 microfarads across the ring supply. No level shifter needed, but the capacitor on the ring is a pain to fit.
Dark will be the default state :)