# 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.

**6 project listed.**

## T-Relay S3 ESPHome Smart Switch Controller

ESPHome configuration template for the LILYGO T-Relay S3 that exposes all 6 onboard relays, LED status indicators, and real-time clock directly to Home Assistant with zero manual GPIO wiring.

[Details](https://openhardware.directory/projects/t-relay-s3-esphome-smart-switch-controller) | [Markdown](https://openhardware.directory/projects/t-relay-s3-esphome-smart-switch-controller/md)

## T-CAN485 ESPHome RS-485 Modbus Gateway

ESPHome package configuration for the LILYGO T-CAN485 that sets up the RS-485 UART interface for Modbus communication, enabling control of solar inverters, batteries, and industrial devices from Home Assistant.

[Details](https://openhardware.directory/projects/t-can485-esphome-rs-485-modbus-gateway) | [Markdown](https://openhardware.directory/projects/t-can485-esphome-rs-485-modbus-gateway/md)

## T-CAN485 Vehicle CAN Bus Monitor with ESP32RET and SavvyCAN

Deploy ESP32RET firmware on the LILYGO T-CAN485 to capture and analyze vehicle CAN bus traffic using SavvyCAN — no soldering required, as the CAN transceiver is built into the $12 board.

[Details](https://openhardware.directory/projects/t-can485-vehicle-can-bus-monitor-with-esp32ret-and-savvycan) | [Markdown](https://openhardware.directory/projects/t-can485-vehicle-can-bus-monitor-with-esp32ret-and-savvycan/md)

## ESP32RET — CAN Bus Reverse Engineering Tool with SavvyCAN

Turns the LILYGO T-CAN485 into a sub-$15 professional CAN bus reverse engineering and sniffing tool with WiFi streaming to the SavvyCAN desktop analyzer, ELM327 emulation, and SD card logging.

[Details](https://openhardware.directory/projects/esp32ret-can-bus-reverse-engineering-tool-with-savvycan) | [Markdown](https://openhardware.directory/projects/esp32ret-can-bus-reverse-engineering-tool-with-savvycan/md)

## ESP-RFID — Standalone Access Control System

A standalone RFID access control system for ESP32 relay boards with web-based user management (1,000+ users), MQTT integration, NTP sync, and support for RC522, PN532, and Wiegand readers.

[Details](https://openhardware.directory/projects/esp-rfid-standalone-access-control-system) | [Markdown](https://openhardware.directory/projects/esp-rfid-standalone-access-control-system/md)

## HeishaMon Cascade Control

Modified HeishaMon firmware optimized for cascade operation of multiple Panasonic Aquarea heat pumps, coordinating load balancing and staging across units for maximum efficiency.

[Details](https://openhardware.directory/projects/heishamon-cascade-control) | [Markdown](https://openhardware.directory/projects/heishamon-cascade-control/md)