Great project! If you don't feel like building your own chicken squisher, there are commercially-available automatic coop doors that you can buy on Amazon. The one I got is Tuya-based, making it easy to integrate into Home Assistant.
Five days after installing it (and thus enabling the chickens to access the outer yard) they were carried away by predators. The 8ft+ wire yard fence didn't extend far enough into the ground to prevent something from tunneling under it.
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