I swear I&#x27;ve seen a similar project like a decade ago, somewhere.<p>I have an easier solution - weigh the cat on a pressure pad just before the flap - allow for variances of a few ounces but not much more.<p>But the cat door is also a safety thing for my cats when they are feeling unsafe or being chased - I wouldn&#x27;t want them to have to wait to get inside.<p>ps. cats bring you dead things as food because they think you are too feable to hunt and triggering a nursing instinct