# device — Open Hardware Directory

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

**3 device listed.**

## Airlytix ES1

ESPHome-native indoor air quality sensor with PM1.0/PM2.5/PM4/PM10, CO2, VOC, NOx, temperature, humidity, pressure, light, and sound monitoring. Designed for Home Assistant with full local control and open YAML configuration.

[Details](https://openhardware.directory/devices/airlytix-es1) | [Markdown](https://openhardware.directory/devices/airlytix-es1/md)

## Heltec HRI-4853

ESP32-based RS-485 to Ethernet/LTE converter (DTU) with built-in web configuration, Modbus support, DIN-rail mounting, and ESPHome compatibility for industrial IoT and Home Assistant integration.

[Details](https://openhardware.directory/devices/heltec-hri-4853) | [Markdown](https://openhardware.directory/devices/heltec-hri-4853/md)

## Heltec HT-M00 Dual Channel LoRa Gateway

A compact, low-cost dual-channel LoRaWAN gateway based on ESP32 and dual SX1276 transceivers, designed for indoor LoRa coverage of 1500-2000 square meters with support for SF7-SF12 spreading factors and LoRaWAN Class A/C protocols.

[Details](https://openhardware.directory/devices/heltec-ht-m00) | [Markdown](https://openhardware.directory/devices/heltec-ht-m00/md)