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Now let's get back to the question.
how to get the camera to automatically switch when going from a daytime environment to a nighttime environment.
VEYE camera module has perfect ISP functions buildin and will automatically adjust the exposure parameters according to the environment.
If your goal is to switch the IR_CUT, and image to black and white at night. here ：
DAY/NIGHT switch mode：
When J3 pin 1 (Day&Night) is high (3.3 to 12V), the IR-CUT switches to the full transmission mode, the image goes to mono mode. When J3 pin 1 is low power, the IR-CUT is the filter infrared mode, the image goes to color mode.
J3 pin list see connection
Using Video Control Toolkits to control daynightmode,