I'll be flat out honest and say that you really don't need it. Yes most of these Linear Actuators used for chicken doors, they move slow enough.
I myself never saw the need for a safety feature like this. The only reason I came up with this is because every time I would advocate for the use of a Linear Actuator instead of less secure & less stable and more time consuming to put together doors, (like string doors, and those car antenna doors), I would get the ole' "but they will crush the chickens". Now I am 47 years old and I have never seen or heard of an actual first hand account of any chicken being killed by an actuator door. Only time I hear it is when some claims they heard or seen it happen. Mind you this is only when they are against using an actuator. it's not like it gets brought up in normal conversations like
"... so you are saying she couldn't have it removed because it was too big? wow! Oh by the way,... one of Jennifer's chickens was crushed by that super slow actuator."
anyway I'm ranting.. LOL
Either way, because I got tired of hearing that, a chicken would get crushed, I came up with this no programming needed, just the ability to follow a diagram, way of doing this.
You can add a motor speed controller to this. You can also have it go down, even slower than it already is, but if the safety feature is triggered it will go up at normal speed.
"It is better to have it and not need it than, need it and not have it." - unknown
If you want to drop the safety feature all you need is this.
View attachment 3103145
More diagrams of the the same circuit just using different connectors.
MHCOZY 4 Channel Smart WiFi RF Bluetooth Wireless This is a cheaper version of the SONOFF but it has all the same features. Plus Bluetooth. And it is smaller. I will be ordering one for testing soon.