I am using more than one sensor and I don't know how to wire the negative terminal of all the sensors to the COM terminal of my module.
The negative terminal of all the sensors must be wired to the COM terminal. If they don't fit in the screw terminal, you can wire them to an external circuit board and have a wire go from the common node to the COM terminal. This way we can be sure that all the sensors will have a common ground.
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