Detect a person in a room with Wi-Fi

A board that reads the Wi-Fi in a room and says whether anyone is there.

Hardan evening

No recorded steps

Some pieces of it have run. There are no recorded steps for this project, so this page does not give any.

What exists:

LP-EM-CC35X1: TI's presence model ran on the board: first result 7.4 s after the host asked, one every 2.0 s, and it fits in one image with a Matter thermostat. It does not separate empty from occupied in this room: 135 of 136 windows in an empty, closed room read present (2026-10-09). A second run on 2026-10-13, 6,290 results over about 4 h, read 100 percent present (cc35x1/csi/results/2026-10-13-freerun.csv).

You would need the board, plus CC35X1 LaunchPad development kit and LP-XDS110ET debugger.

What to build next

Send a sensor reading to Home Assistant over Wi-FiA sensor that reports over your Wi-Fi into Home Assistant

A DNS ad blocker on a Wi-Fi boardA board that answers 0.0.0.0 for ad and tracker names on your network

Blink an LEDThe board's LED blinks, then blinks the pattern you asked for in plain English

Every build. The code for all of them is in the GitHub repository.

Evidence and limitsTI's model runs, with a result every 2 s, but in this house it said present in 98 percent of windows, even in an empty room. Ran on 1 board. Results, sources, timing and limits.

Which boards ran it

Could work LP-EM-CC35X1: TI's presence model ran on the board: first result 7.4 s after the host asked, one every 2.0 s, and it fits in one image with a Matter thermostat. It does not separate empty from occupied in this room: 135 of 136 windows in an empty, closed room read present (2026-10-09). A second run on 2026-10-13, 6,290 results over about 4 h, read 100 percent present (cc35x1/csi/results/2026-10-13-freerun.csv).

Experiments (2)

Status	What was tried	Result
Could work	Does TI's Wi-Fi CSI presence model on the LP-EM-CC35X1 detect a person in a room through the house Wi-Fi, and how well? CC35X1, 2026-10-09	In a lived-in house the shipped model said "presence" in 98% of scored windows across 21 minutes. In the one phase with a known label, the room empty with the door closed, it said "presence" in 135 of 136 windows. It...
	Can one LP-EM-CC35X1 run the Matter thermostat built here and TI's Wi-Fi CSI presence detection at the same time, and what does it cost? CC35X1, 2026-10-12	It fits, boots, pairs and runs. The Matter thermostat and TI's CSI presence pipeline link into one image with 12.1 kB of main RAM and 0.2 kB of TCM to spare. The pipeline's buffers are routed to main RAM, because TI's...

Source files

Experiment write-up (CC35X1): what was tried and where it stopped

Get the code and tell us how it wentThe clone command, the board folder with its AGENTS.md, reports from others, and the three report forms.

Get the code

Clone the repository and open the board's folder below. AGENTS.md is a plain text file of notes for AI coding assistants, and llms.txt at the root indexes the site for one.

git clone https://github.com/Fox-Red-Labs/fox-red-labs.git

LP-EM-CC35X1: folder cc35x1/.
- README: the board's lab notebook (what was run, in order)
- Notes for an AI coding assistant working in this repository: notes for an AI assistant; copy it into your own project if you use one
- FAQ: errors and fixes

Code is BSD-3-Clause, writing is CC BY 4.0; third-party folders keep their own licenses.

Built it? Tell us

Built this, or got stuck? Report it on GitHub with a few short answers. Your report shows here in your words, marked as yours. A failure that repeats on the bench gets its fix here.

Share a projectWhat you built or ported, what it runs on, a photo or a clip, and anything that did not work.Report a problemThe step, the exact error text, your tool versions. Once it repeats on the bench, the fix goes on the page.A prompt that workedWhat you typed and what came out.