>>2992936
the point of a greenhouse (among other things) is to keep out pests. leaving the door open all day defeats this purpose.

>>2992941
It's not like you have any choice. If you keep the door closed the plants inside will cook to death. Insects were never an issue, if you are worried about those you could install a mosquito net

I can't find a picture to make sure but I think the ones at the botanic garden are a rack and pinion system. You would have to deal with the bulk of the rack sticking out into the enclosure.

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>>2992936
I assume the 'door' you are talking about is the vent in the roof and not the door for people. Moving something like that if it is a tight fit would require some rather robust mechanism compared to a much simpler solution. Put a hole in the thing near the ridge and install a fan. Use a louvered fan like picture related and size it to your needs. When not blowing the louvers close to keep the heat in. Maybe add mesh if bugs are getting in. Now all you need a simple timer or thermometer. They make solar powered ones or you could just use a DC fan and rig up some batteries. It would probably need less power than whatever would be robust enough to acuate that door anyway.

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>>2992946
Heres a pic of what im talking about but at the Brooklyn botanic garden this whole system is on the inside high up near the roof. Can just have one motor for several windows.
Use sendcutsend or something similar for the gears/racks.

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>>2992948
No i mean the actual door not the window. For the window you can just use this which costs like 20 bucks.
>>2992951
Hmm seems a bit complicated, i wonder if i can just have basically two rubber bands one that pulls it open and one that pulls it closed and use the motor as a winch

>>2992936
Do this poli greenhouses make a lot of noise when it rains?

>>2992936
small stepper motor with a cam on it?
add in an auto door closing arm, or weight the door to swing closed if the cam is retracted. likely have to remove the latch within the door handle to simplify things.

>>2992936
put you motor on a wheel and attach the wheel to the door, maybe use a gear reduction if the door is heavy

or put the motor on a gear which pulls a chain like a rack and pinion

>>2992936
>>2992945
There exist thermally expanding greenhouse window struts (filled with some gas) that open the windows proportionally to the inside temperature, purely mechanical. Just install one sideways on the door. Theres no way it will get too hot if both ceiling windows are open and the door is at 5” gap

>>2992936
>I want to design some sort of doohickey to automatically open the door in the morning and close it at night.
so then do it. why are you here?

>>2992941
just use meshes in the openings

>>2992936
the main problem of motor on the door is still being able to open it by hand.
presuming that the door is on a slide like a normal greenhouse i would say some kind of motor and some kind of timing chain (plastic) at the top and put a bolt through it into the door. a microswitch at each limit, some kind of 8 bit mcu (as much as i hate them arduino would suit someting like this but an esp whatever means you could control it wirelessly ) a little motor driver and you are good to go. stepper motor and brushless driver module is the easiest way to have any kind of control over speed, you could even ramp it up i suppose. and then as long as you arent supplying hold current to the motor you can just push the door by hand anyway. then if you want to go crazy maybe an ir distance sensor and you can set the actual position you want the door to be.

i do hate those window temperature openers i never could get one to work properly, so as much as i want to tell you to replace a second window with an opening one, i will support your retarded quest. good luck and god speed.

Make some ghetto fab setup with a servo motor and a quick release rocker arm attached to the handle for when you need to manually do stuff

>>2992958
do you really need a greenhouse if it gets that hot?

>>2992936
You could do a solar powered fan. When the sun is out it will blow.