You can get them much cheaper than that on AliExpress hehe, though you might pay twice for quality. And yep you can wire them straight into each other, no pull-ups or nothing!
Caveats:
I got the LD2410s variant because I think it’s the only one that actually operates at 3v3, but unfortunately it’s not quite supported by ESPhome yet so I’ve been having issues getting it to do anything with HA. Methinks stick with 5V versions for now and use a voltage regulator for the GPIO since the ESP32 is not 5v tolerant for GPIO inputs (or: use a Raspberry Pi which can handle anything).
Do not use the brand new spanking ESP32C6 for that sweet sweet BLE and Zigbee functionality, because despite the arduino framework saying they support it in practice you’ll have to default to using the idf-esp framework, which isn’t a huge issue but does seem to throw me stranger errors.
You can get them much cheaper than that on AliExpress hehe, though you might pay twice for quality. And yep you can wire them straight into each other, no pull-ups or nothing!
Caveats: