## Overview

A white LED desk nameplate that spells **LARRY** in a 3x5 bitmap pixel font. Designed as an Adom molecule (72 x 24 mm, 4-pin machine contact) so it can be manufactured on the InstaPCB workcell.

## How it works

- **44 white LEDs** (0603) arranged in 5 letters: L-A-R-R-Y
- Each LED has its own **220 ohm current-limiting resistor** (0402)
- All LED+resistor pairs wired in **parallel** from VBUS to GND
- **USB-C connector** on the east edge with 5.1k ohm CC pull-downs
- **100nF bypass cap** on VBUS for decoupling
- Total draw: ~400mA at 5V (2W) — any phone charger handles it

## How to use it

1. Grab any USB-C cable (iPhone charger works)
2. Plug one end into the board's east edge
3. Plug the other end into a 5V USB-C power source
4. LARRY lights up white

## Bill of Materials

| Component | Value | Package | Qty |
|-----------|-------|---------|-----|
| LED | white | 0603 | 44 |
| R | 220 ohm | 0402 | 44 |
| R_CC1, R_CC2 | 5.1k ohm | 0402 | 2 |
| C_BYP | 100nF | 0402 | 1 |
| J1 | TYPE-C-31-M-12 | USB-C | 1 |

## Pixel font

Each letter is a 3-wide x 5-tall grid at 3mm pitch:

```
L:        A:        R:        R:        Y:
X . .     . X .     X X .     X X .     X . X
X . .     X . X     X . X     X . X     X . X
X . .     X X X     X X .     X X .     . X .
X . .     X . X     X . X     X . X     . X .
X X X     X . X     X . X     X . X     . X .
```

LED counts: L=7, A=10, R=10, R=10, Y=7 = 44 total.

## Design details

- Board: 72 x 24 mm, 2-layer, 1.6mm FR4, round edges
- Molecule type: 4-pin with MachinePinMediumStandard
- 4 corner machine contacts: MC_VCC1/MC_VCC2 (north), MC_GND1/MC_GND2 (south)
- Scaffold contacts feed the same VBUS/GND rails as USB-C — board can be powered either way
- Pixel pitch: 3mm LED-to-LED, 4mm gap between letters
- White LED Vf ~3.0V, so 220 ohm at 5V gives ~9mA per LED
- USB-C on east edge using UsbCReceptacle wrapper (TYPE-C-31-M-12, JLCPCB C165948)

## Built with

Authored in tscircuit (TSX), previewed with adom-tsci, published to the Adom Wiki.