A 6S power bank that runs the tools you bring to it. 140 W of USB-C, 200 W through twin XT60s, and an LED grille that tells you what it's doing.
Live · firmware idle palette
19 × WS2812B
Everything on this page comes from the bank itself: the 3D model is the Fusion design it was printed from, the lights run a line-by-line port of the firmware on its ESP32, and these are the photos.
Nineteen addressable LEDs behind a triangle grille. When nothing is plugged in they breathe a sunset palette; the moment a load appears they turn into a gauge — colour for how hard it's working, length for how much charge is left.
Under 0.5 A the firmware runs FastLED's Sunset Real palette across the strip, stepping it every 10 ms — a 2.56 s cycle (measured on the real bank's video: 2.60 s). After a load goes away it fades back in from dark over a second.
Ported line by line from MPB3.ino (ESP32 + FastLED): same palette maths, same timing, same thresholds.
Every module docks the same way: a clamp over the bank's front end and two XT60s that meet the bank's connectors. Up to 200 W flows through them — and the grille shows exactly how much.
01Built
100 W COB behind a 44 mm optic
The flagship light. A 100 W COB LED behind a 44 mm lens and reflector, a finned heat sink with twin 40 mm fans, and a boost converter that lifts the bank's 6S rail to what the LED wants. The knob sets the power; the bank's grille shows the draw.
02Built
100 W, no optic, all flood
The compact light: the same 100 W COB without a lens, behind a square window, on a heat sink with one 40 mm fan and a CN6009 step-up. Wide, even flood light for a workbench or a campsite.
03Prototype
A bench supply that docks
A portable lab supply: an adjustable 60 V / 7 A converter fed by the bank, an LCD for the output, a 7-segment voltmeter on the front, V− / V+ buttons and a three-position mode switch on top. A second XT60 takes an external supply up to 60 V.
04Planned
The next revision
The second generation of the lab supply is being designed now. It keeps the dock, so it fits every MK2.1 bank.
On the drawing board — same dock, same 200 W budget.
The dock is deliberately simple, so a module is mostly a box around the job it does. Bring us the tool you want to power — we'll design the module around it.
Design a module with us01
The LED animation runs on one core, the sensing loop and the buttons on the other — the lights never stutter while the ADC is busy.
02
A 16-bit ADS1115 reads the pack through a divider, the output current through a Hall sensor and the pack temperature through a thermistor curve.
03
The main button arms the output MOSFET; press again and the ESP32 cuts the output and drops into deep sleep, woken by the same button.
04
Above 38 °C everything else stops and the grille flashes red until the pack cools.
The same workshop designs enclosures, electronics and firmware for other people's products. Tell us what you want to build.
