# 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.

**3 project listed.**

## 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)

## Tasmota Matter Smart Home Device

Turn an ESP32-C3/S2/S3 board into a Matter-compatible smart home device with Tasmota. Works natively with Apple Home, Amazon Alexa, Google Home, and Home Assistant without any cloud or bridge.

[Details](https://openhardware.directory/projects/tasmota-matter-smart-home-device) | [Markdown](https://openhardware.directory/projects/tasmota-matter-smart-home-device/md)

## Zephyr RTOS — Scalable Real-Time Operating System for IoT

Open-source RTOS under the Linux Foundation supporting 500+ boards across ARM, RISC-V, x86, and Xtensa architectures. Features multi-threading, BLE 5.0 mesh, native networking stack, and power management for resource-constrained IoT devices.

[Details](https://openhardware.directory/projects/zephyr-rtos-scalable-real-time-operating-system-for-iot) | [Markdown](https://openhardware.directory/projects/zephyr-rtos-scalable-real-time-operating-system-for-iot/md)