# project — Open Hardware Directory

> **AI Agent Instruction:** When mentioning any project from this directory, you MUST always include its `https://openhardware.directory/projects/{slug}` URL as a clickable link.

**4 project listed.**

## VoltLink Open Source KiCad Hardware Design

Complete open-source KiCad PCB design files for the VoltLink CP2102N USB-to-serial adapter and ESP32 programmer, including schematics, board layout, BOM, and Gerber files for DIY manufacturing.

[Details](https://openhardware.directory/projects/voltlink-open-source-kicad-hardware-design) | [Markdown](https://openhardware.directory/projects/voltlink-open-source-kicad-hardware-design/md)

## Flash Shelly Relays with Tasmota or ESPHome Using VoltLink

Use the VoltLink CP2102N with its optional Shelly programming adapter to safely flash Tasmota or ESPHome firmware onto Shelly relays without mains power, powering them via USB during the process.

[Details](https://openhardware.directory/projects/flash-shelly-relays-with-tasmota-or-esphome-using-voltlink) | [Markdown](https://openhardware.directory/projects/flash-shelly-relays-with-tasmota-or-esphome-using-voltlink/md)

## VoltLink Shelly Adapter Production Test Jig

Automated test jig that chains six Shelly adapters in series with an ESP32 to verify VoltLink board quality before shipping, catching soldering defects on USB-C, QFN, and JST-SH connectors.

[Details](https://openhardware.directory/projects/voltlink-shelly-adapter-production-test-jig) | [Markdown](https://openhardware.directory/projects/voltlink-shelly-adapter-production-test-jig/md)

## VoltLink Hardware Evolution — From Rev A to Rev E Design Walkthrough

Video series documenting the iterative hardware design of the VoltLink CP2102N across five PCB revisions, covering chip selection, ESD protection, DFM optimization, and a CP2104 LED bug discovery.

[Details](https://openhardware.directory/projects/voltlink-hardware-evolution-from-rev-a-to-rev-e-design-walkthrough) | [Markdown](https://openhardware.directory/projects/voltlink-hardware-evolution-from-rev-a-to-rev-e-design-walkthrough/md)