ReSpeaker Lite + mmWave

[slow ginkgo]

I have a ReSpeaker Lite being shipped to my home (at least I hope). Is it possible to add an mmWave sensor to the ReSpeaker Lite and if so how (e.g. I'm new to HA, ReSpeaker, and sensors in general). Ideally I want a voice assistant + mmWave sensor in every room/area of my home. Appreciate your help!

[pulsar kiln]

Hi! For Respeaker Lite you can start here: https://community.home-assistant.io/t/respeaker-lite-new-seeed-studio-voice-assistant-development-kit-hardware-combine-esp32-with-xmos-xu316-dsp-chip-for-advanced-audio-processing-as-a-esphome-based-home-assistant-assist-satellite-voice-devkit/756944/
On the topic: unfortunately there's no free pins on S3 for additional hardware, at least if you have XIAO S3 board soldered to the Respeaker. You may use D2-D3 pins, that are intended for buttons, but you'll loose functionality of mute/user buttons.

Another approach would be to use different S3 board (like Devkit-C, for example), but you'll have to solder it yourself according to pinout on Respeaker.

[slow ginkgo]

I have no plans to use the mute/user buttons on the device itself because it will be installed in the ceiling. Supposedly I am getting the ReSpeaker Lite with the soldered on XMOS chip.

How would I go about using D2-D3 pins to add a mmWave sensor? Don't most mmWave sensors require 3+ pins. Then again, I've never purchased nor soldered on a mmWave sensor but more than willing to learn.

[pulsar kiln]

I have bunch of ld2410, and they need UART connection, so 2 GPIO pins (plus 5v and GND).
However, if you don't solder mute button to the pin, you won't be able to toggle mute programmatically either...

[slow ginkgo]

Is there any other way to add a mmWave sensor to a ReSpeaker Lite Voice Assistant kit (that also has XMOS soldered on)? Like perhaps buying a separate mmWave sensor and "plugging" into the power source of the ReSpeaker Lite? I wouldn't be apposed in running two CAT 6 cables to each and use POE USB-C power adapters and have two physical devices (if needed) in the same spot in the ceiling. I know there are multiple satellites PCB kits in the works but I'm just noodling on some other possibilities.

[pulsar kiln]

I guess you could use 5V and GND from S3 (or even from Respeaker board itself, check its bottom-middle part for pads) to power other ESP board...