Is the HW-MS03 microwave sensor a suitable sensor to detect humans or cars passing by on a street orthogonal to the sensor?
How is the accuracy and range affected by a window? Locate it inside the house would prevent a lot of work in order to protect the sensor of unfavourable weather conditions....
This may have the answer to at least one of your questions:
If not, they're so cheap, I'd just buy one (either the HW-MS03, or one of the others, or maybe all of them) and try it.
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