# 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.

**10 project listed.**

## 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)

## Retro Power Meter Display for T-Display S3

A retro-styled multimeter interface for the LILYGO T-Display S3 using an INA219 power sensor, displaying voltage, current, temperature, humidity, pressure, RTC time, and resistance on a classic LCD-style UI.

[Details](https://openhardware.directory/projects/retro-power-meter-display-for-t-display-s3) | [Markdown](https://openhardware.directory/projects/retro-power-meter-display-for-t-display-s3/md)

## OpenDTU — Open-Source Solar Inverter Monitoring

Replaces Hoymiles, TSUN, and Solenso cloud gateways with a privacy-respecting local solar inverter monitor — real-time power data via MQTT and web UI on an ESP32 with wired Ethernet support.

[Details](https://openhardware.directory/projects/opendtu-open-source-solar-inverter-monitoring) | [Markdown](https://openhardware.directory/projects/opendtu-open-source-solar-inverter-monitoring/md)

## HeishaMon Firmware

Open-source MQTT gateway firmware for Panasonic Aquarea heat pumps, enabling local monitoring and control via ESP8266 or ESP32-S3 with MQTT, HTTP JSON API, built-in rules engine, and 1-wire sensor support.

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

## HeishaMon Home Assistant Integration

HACS-compatible Home Assistant integration for Panasonic Aquarea heat pumps via HeishaMon, providing native entities, climate controls, sensors, and multi-heatpump support through MQTT auto-discovery.

[Details](https://openhardware.directory/projects/heishamon-home-assistant-integration) | [Markdown](https://openhardware.directory/projects/heishamon-home-assistant-integration/md)

## GoHeishaMon

Golang port of HeishaMon firmware that runs directly on the Panasonic CZ-TAW1 WiFi adapter, enabling MQTT heat pump control without additional hardware by repurposing the factory WiFi module.

[Details](https://openhardware.directory/projects/goheishamon) | [Markdown](https://openhardware.directory/projects/goheishamon/md)

## HeishaMoNR – Node-RED Heat Pump Control

Node-RED flow for local control of Panasonic Aquarea heat pumps via HeishaMon, featuring visual dashboards with charts, weather-compensated heating curves, and advanced automation logic.

[Details](https://openhardware.directory/projects/heishamonr-node-red-heat-pump-control) | [Markdown](https://openhardware.directory/projects/heishamonr-node-red-heat-pump-control/md)

## ESPHome Panasonic Aquarea Heat Pump

ESPHome-based alternative firmware for the HeishaMon PCB, enabling YAML-configured Panasonic Aquarea heat pump control with native Home Assistant API integration and OTA updates.

[Details](https://openhardware.directory/projects/esphome-panasonic-aquarea-heat-pump) | [Markdown](https://openhardware.directory/projects/esphome-panasonic-aquarea-heat-pump/md)

## Dynamic Electricity Price Heat Pump Control

Optimizes Panasonic Aquarea heat pump operation based on dynamic electricity prices (Tibber) or solar PV surplus, reducing energy costs by shifting heating to cheaper rate periods.

[Details](https://openhardware.directory/projects/dynamic-electricity-price-heat-pump-control) | [Markdown](https://openhardware.directory/projects/dynamic-electricity-price-heat-pump-control/md)

## Heisha Weather Control – Adaptive Heat Pump Manager

Home Assistant add-on for Panasonic Aquarea heat pumps with HeishaMon that uses weather forecasts and a learning algorithm to optimize water temperature and energy efficiency automatically.

[Details](https://openhardware.directory/projects/heisha-weather-control-adaptive-heat-pump-manager) | [Markdown](https://openhardware.directory/projects/heisha-weather-control-adaptive-heat-pump-manager/md)