I agree with you. I also often get results that are different from what I expected. So I do my best to gather as much useful information as possible.

when do you need this in your smart home? (just asking cause curious :)

@@AndrewTSq Presence on a room/area scale. You can make the lights or music follow you around the house. You can differentiate between multiple people with multiple preferences for each room. This is one of the unsolved smart home issues at this moment. There are multiple solutions, but the position update rate to make it really usable is just not available yet. You need it to be fast enough to turn on the lights in the hallway the second you leave the room, this is hard.

@@BazzzB Okey!, thanks :) I saw a interesting sensor for the lights. Its a human presence sensor using radar, and there was someone here on youtube that used it with home assistant, and it turns on the lights instantly. Very cool and they were like $1 each also. It could also tell how many people in the room :)

@@eledikohabib3369 hello, TDoA is another method to reduce number of anchors in RTLS . mostly 2 anchors sufficient for 2D relative positoning instead of 3. Extending number anchors is related to superframe structure and correct and precise implementation of TDMA in UWB but maximum 16 anchors in 2Way ToF amd 32 anchors in 1 way ToF

Unfortunately, there is no library that makes DW3000 work properly on ESP32. If you make a driver, you can drive the UWB module directly on ESP32. Of course, I tried it, but it was not easy to implement this alone at a hobby level. In the end, I gave up and used a product that was easily available on the market. Perhaps the company selling this product implemented a driver for STM32 and made it controllable through ESP32 instead of sharing it, so that it can be hidden. This is my guess.

@@IvanTereh Hello , for Decawave DW3000 or DW1000 (now Qorvo mark) uwb technology maximum accuracy in 2D can be around +/- 5 cm and 3rd dimension not accurate than 20cm in best condition. Update rate for each ToF calculation can reach to 160 hz.

Quick question. What kind of project do you need something like this?

@@ThatProject I think mine's quite sam as yours. I'm doing my Bachelor-Graduation project, I shall use LoRa moduls to build up an LPS. I tried to use NTP protokol to apply TDoA method, but it seems quite hard to reach time synchronization. But Signal-Intensity method runs good

No no no. This is using only UWB tech.

@@ThatProject i believe uwb can detect human breathing /human presence

@@atabac really? Is there a paper I can refer to for that?

@@atabac there are cheap radar modules that can do that atleast. not sure about uwb?

​@@AndrewTSquwb is rf, why cant it be used as radar? there are many papers using uwb to detect human presence by detecting their breathing.

Calculating local coordinates x,y,z using trilateration doesn't seem easy. (I tried, but it was difficult to get reliable values) There was a project I tried in the past using 4 anchors. Check this out. kzfaq.info/get/bejne/bdWVm9Nzz9bZk4k.htmlsi=bhal94qB7I03IH65

@@ThatProject Thank you!

@@huckleberryfinn-cz3gdhello, dilution of precision and microcontroller floating point calculation will have major effect in accuracy even tag wad fixed in one location. After that RF characteristics of envirement have second important role in calculation.

@@pouyazarafshan but that only applys if they have a clear line of sight? cause otherwise I guess moving objects in the room would interfere with the uwb?

@@AndrewTSq Noise sources that affect the accuracy of Tag position calculation are: multipath effect (exists in LoS and NLoS situations), antenna beam and orientation (these patch antennas have two nulls in pattern related to PCB edges), microprocessor floating point calculation, UWB channel configuration such as percision. signal delay time value inside the firmware, uwb message preamble lenght..., another RF device such as a router in the same frequency band. These sources effect on time of flight calculation regardless of whether the tag is moving or fixed.