I have a couple of home automations that I’d like door sensors for, I absolutely despise batteries, so I’d like something I could run from the mains.
Ideally WiFi, but would be okay with Zigbee or Zwave.
A solution I was thinking of would be to use a typical off-the-shelf reed switch (i.e for a typical alarm system) and and wire it up to a shelly or similar. The problem is the shelly is either high voltage AC (which I cannot use directly with these low voltage reed switches) or low voltage DC, not both. It would be nice to avoid a power supply.
Does anyone know of any hardware I could use to achieve this?