
Originally Arducam only produced a manually switchable version of this camera. This was excruciating, because to toggle the IR filter you had to write a program (or shell script), which almost nobody did. It was not supported by Motion or mjpg-streamer. Also, the RPi 4 was missing the GPIO pin that controlled the filter, so it was useless. The automatic version uses the same photoresistor as the lights to switch the filter. Sometimes it works. When the brightness is in the right range, however, the filter toggles constantly and quickly, with a noise that sounds like it's about to fall to pieces - which it is. I wanted to try to crack the snapback but my camera broke before I had a chance. It doesn't look like you can't buy the manual version anymore. But it also looks like there are still a few manuals in stock so you might accidentally get one so watch what you get. Radiators have a very short range. I used one to capture wild animals at a waterhole (well, a tub of water). The extreme range is 4-5 feet. I used another one on an 18" 3D printer which was perfect but the flapping filter ruined it. If I could find a manual one I would try hacking mjpg-streamer. but it is too late to be of any use to anyone.

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