MANY times. No voltage is perfect. The Xiaomi Aqara and Mijia contact sensors work well. Neocoolcam are garbage in my personal opinion (queue the Z-Wave fans to attack my personal opinion). Xiaomi are fine if you are careful about the repeaters you use. Not all work with them and range isn't great unless it's a Xiaomi hub you attach them to and then sync back to HE via HomeKit/Homebridge automation (this is what I do).
If there is voltage on one of these project for the contacts or power you need to monitor, you simply put a regular relay on that device you're monitoring so that the voltage turning ON at the device engages the coil of the relay, thus closing the relay's dry (no-voltage) contacts, to where you have connected the door/motion sensor (at the reed switch).
