March 8, 2026
Smol board, big feelings
PCB devboard the size of a USB-C plug
Tiny USB-C dev board sends makers into a size vs. power showdown
TLDR: A USB‑C‑sized dev board using a tiny Arduino‑ready chip has people cheering its micro form factor and questioning its power. The hottest debates: “Why not use an ESP32/STM32?” and “Should it be a male USB‑C plug?”—proof that tiny hardware can spark giant opinions.
A dev board barely bigger than its own USB-C plug just crash‑landed in Makerland, and the comment section went full popcorn. The AngstromIO board runs a tiny Arduino‑friendly chip (Attiny1616), packs two rainbow LEDs, and breaks out a few pins for basics. There’s even a matching programmer with dual USB chips for plug‑and‑play coding, plus a separate budget RISC‑V board with a mini LED grid for experiments. Translation: a teeny toolkit with a cute glow and big learning vibes, even if it’s not a Wi‑Fi beast.
But the community is split. One camp shouted “ESP32C3 when?”—as in, why not a beefier board with wireless—while minimalists cheered the “fits anywhere” charm. Skeptics asked, why go this small at all? Another wishlist item: an STM32 version. And a connector nitpick blew up when someone asked, “Why not USB‑C male?”—cue a mini debate over direct‑plug convenience vs. cable flexibility. Meanwhile, hype beasts swooned over the purple board and clean docs, dropping “sexxxy” like it’s 2011 Tumblr. Fans also loved that it’s Arduino‑compatible thanks to megaTinyCore. In short: Team Smol says stealth installs and blinky art; Team Spec wants more power and radios. The only thing bigger than the board? The opinions about it.
Key Points
- •AngstromIO is a 8.9 mm × 9 mm devboard using an ATtiny1616 MCU with I2C breakouts and UPDI programming.
- •A dual CH340E board provides SerialUPDI programming and separate USB-to-UART debugging with two USB-C ports.
- •The programmer includes a 3.3 V LDO and selectable 3.3 V/5 V operation; only the serial USB-C supplies 5 V.
- •A breadboard-friendly CH32V003 RISC-V devboard features a 4×5 charlieplexed LED matrix and SWIO programming via WCH LinkE.
- •All designs are Arduino or Mounriver Studio compatible and were created in EasyEDA Pro, panelized into a single PCB; BOMs are forthcoming.