Have been thinking about this for a couple years. I have old phones kicking around. Battery shot, hardware dated, but the camera(s) and mic and antennas still work. Would be cool if there were a way to set them up (powered) to stream audio/video or even take stills at intervals (or motion-activated) and then sync the content to the rest of the devices on my network.
I don't know how complex the programming for something like this would be. But I suspect it's trivial for those who do know.
This does not happen AFAIK. Most phones have no shutters so tge sensors receive light all the time, and the little required power does not overheat it.
This is a valid point but the actuators in a phone camera's focusing mechanism are more like a speaker than a motor. They can last for ages, and many apps allow disabling autofocus when idle.
This one is valid. Even basic image processing is a load on the CPU, and recording/streaming definitely is. Depends on how the camera is mounted to allow airflow.
Sure. The stakes are not very high if the phone would otherwise lay in a drawer.