Probably one per room because all the examples at https://github.com/francescopace/espectre/blob/main/CALIBRAT... are about a single room.

Is the author reads this, how does the system cope with multiple rooms in the same house, maybe a two or three storeys house?

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francescopace 9 hours ago | parent [-]

Yes, you’re both correct:

You need one sensor for each area you want to monitor independently. With devices more capable than the ESP32‑S3, the coverage would likely be greater.

The ESP32‑C6, in particular, offers significantly better performance. Check out this comparison video from Espressif: https://www.youtube.com/watch?v=JjdpzM6zVJ8

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yoavm 8 hours ago | parent [-]

How about if I want to monitor the apartment as a whole? Would 100m2 be too much for one sensor to handle?

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francescopace 8 hours ago | parent [-]

It really depends on the environment: wall materials, interference, signal strength, and even temperature and humidity all play a role. Honestly, 100 m² is probably too large for a single sensor to cover reliably.

That said, ESP32 boards are very inexpensive, you can find them online for around €1 or even less.

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yoavm 7 hours ago | parent [-]

Is the ESP-S3 your recommendation? Or should one look into the ESP-C6 / another model? The prices I'm seeing here in Sweden are more around €10 rather than €1, but I guess that's still much less than the average presence detector.

	▲	francescopace 6 hours ago \| parent [-]
		The price difference can vary wildly by region, but €10 is still super cheap compared to a dedicated presence sensor! Regarding the chip recommendation, it’s a classic trade-off: ESP32-S3: This is what I mainly recommend today. It gives you more raw processing power (dual-core), which is great for managing the OS, MQTT, and the CSI analysis without hiccups. ESP32-C6: I just ordered a C6 myself to run extensive tests! The C6 might have a superior quality Wi-Fi module and better internal CSI extraction capabilities due to hardware improvements.