Add Panasonic ERV Local Control to DIY Projects

[ShadowZZP]

Adds my own project to the DIY Projects section (self-submission).

A ~$5 ESP32 running ESPHome replaces the OEM Wi-Fi module of a Panasonic fresh-air heat exchanger (ERV) and speaks the unit's CN12 serial protocol directly, making it a fully local Home Assistant / HomeKit fan — no cloud, no OEM module.

The link points to the write-up on the community forum. Source is MIT-licensed on GitHub: https://github.com/ShadowZZP/esphome-panasonic-erv (includes the full protocol documentation and a frame decoder).

[github-actions]

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Awesome list validation

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Entries checked

Entry	Section	URL
Panasonic ERV Local Control	DIY › 🔨 DIY Projects	https://community.home-assistant.io/t/local-control-of-a-panasonic-erv-fresh-air-heat-exchanger-with-a-5-esp32-esphome-no-cloud-no-oem-module/1015446

What was checked

• URL hygiene (HTTPS, no shorteners, no duplicates, no tracking params)
• Repository status (not archived, age ≥6 months, last push <18 months)
• License (OSI-approved; CC accepted for Other Awesome Lists)
• README presence and Home Assistant mention
• HACS structure (hacs.json) for Custom Integrations and Custom Cards

Full criteria: .github/CONTRIBUTING.md.