AngstromIO, a devboard smaller than a USB-C connector, packs the Attiny1616 MCU with 16KB flash into an 8.9mm x 9mm footprint. Its breadboard-friendly design exposes SCL, SDA, and UPDI pins, while dual RGB LEDs (SK6805-EC15) enable visual feedback. The board’s USB-C power delivery and Arduino compatibility make it ideal for space-constrained projects, though some libraries require workarounds.

A dual CH340E programmer accompanies the AngstromIO, splitting duties between UPDI programming and serial debugging. One CH340 handles 5V programming via USB-C, while the other provides 3.3V UART debugging. An onboard LDO regulates voltage, and a 3.3V/5V switch caters to mixed-logic projects. This tool simplifies firmware development for the Attiny1616 without requiring external adapters.

The CH32V003 devboard focuses on experimentation, featuring a RISC-V MCU with 26KB flash and a 4x5 charlieplexed LED matrix. Its 3.3V operation with 5V-tolerant I/O pins suits low-power prototyping. Programmed via MounriverStudio, it’s designed for learning low-level chip programming and matrix control. The panelized PCB design (EasyEDA Pro) integrates all three boards, streamlining manufacturing.

These tools target hobbyists and engineers seeking minimalist hardware solutions. AngstromIO’s compact form factor and Arduino familiarity lower entry barriers, while the CH340 programmer and CH32 devboard offer cost-effective pathways to explore RISC-V and matrix-driven projects. BOMs and schematics remain in development, but the open-source approach aligns with community-driven innovation trends.