gliim
Unit 000 · Trying
Lighting for large indoor spaces

gliim

The dim-witted gnome that tries.

Turn a knob. A row of lights follows.

62% turn it — drag, scroll, or use arrow keys

A traditional Indian home with carved teak pillars and a red-oxide floor, three areas lit to different levels, and a three-knob control plate on the near wall.
A room that wants different light at different hours.
The whole interface

One knob. One row.

The knob you reach for is the row that moves.

Turn it and the row follows your hand, down to almost nothing.

Press it and the row goes out, then comes back where you left it.

The gliim enclosure: three knurled knobs in a row and one small warm indicator light below them.
Three knobs and one small light. Nothing else on the face.

The knob does not have to be near the lights.

Across a room

A panel at every door.

by the door far wall · same cable no cable
Some panels share a thin cable. Some manage without one.
A gliim panel on a plastered wall beside a doorway, a thin cable running down from it into the wall.
One cable, carrying the conversation and the power.

One by the near door. One on the far wall. One with no cable at all. Turn any of them and the same row answers.

None of them is in charge, which is why adding another just works.

Rooms it is for

Places that outgrew the switch by the door.

Halls, dining rooms, workshops, studios. Rooms where the light should change, and the person who wants it changed is never beside the switch.

Everyone already knows how to use it.

What else could you do?

How gliim compares with a dimmer switch and smart bulbs
Feature A dimmer
switch
Smart
bulbs
gliim
Turn it down from One spotYour phoneAny door
Needs an app NoYesNo
Wi-Fi is down FineStopsFine
Turned right down Often flickersUsually fineSmooth
Adding another control RewiringAnother phonePlug one in

gliim is the small one in between. A knob at every door, nothing to configure, and nothing to install on anybody's phone.

In fairness

What it will not do.

It will not sense the room, learn your habits, or notice the sunset. It has no clock. It cannot be reached from a phone.

If the power fails it returns at the level you left it. A light that boots into darkness looks broken.

Specification

gliim-3 · rev A

The renders above are how it is meant to end up. The boards are still on the bench. For anyone who wants the numbers:

Light

Channels
3, dimmed independently
Drive
PT4115 constant current
Current
667 mA per channel — set by a resistor, 200–700 mA
Per channel
up to ~5 LEDs in series
Dimming
16-bit PWM at 305 Hz
Range
1638:1, gamma-corrected
Output
~18 W total across three channels

Control

Knobs
3 × EC11 rotary encoder, with push
Panels
any number; any panel runs any zone
Indication
addressable LED chain — link state and per-channel level
Memory
levels saved to EEPROM, restored on power-up

Link

Wired
RS-485, 115200 baud, ~15 m on 2-pair telephone cable
Wireless
HC-12, 433 MHz — where cable cannot go
Connector
RJ11 6P6C, two per node, daisy-chained
Nodes
~128 electrically; panel power runs out first, near 10

Power

Input
USB-C PD at 15 V
Logic
5 V, buck-regulated
Bus
15 V to the panels, fused at 200 mA
Battery panel
18650 or LiPo, ~40 days between charges

Boards

Driver node
ATtiny3226 — two USARTs, 32 KB flash
Panel
ATtiny3216
Firmware
C++ on megaTinyCore, flashed over UPDI
Build cost
~₹1,300 a driver, ~₹450 a panel

In fairness

Certification
none — it is a self-built board
Warranty
none
Mains
not mains-rated; runs from a USB-C supply
Licence
MIT — schematics, firmware and BOM are public
Family

Part of starstucklab.

A small ecosystem of personal engineering instruments, each built to solve one specific problem and then, ideally, stop demanding attention.

Where science met poetry, had a brief fling with engineering, and now raises mildly disillusioned but talented offspring.