Inside a $1 radar motion sensor
10maurycy10.github.io
Inside a $1 radar motion sensor
1–10 of 108 posts
Re: Inside a $1 radar motion sensor
#2Through-wall 2.4Ghz Wi-Fi CSI radar can be done with $20 ESP32 boards, https://github.com/Marsrocky/Awesome-WiFi-CSI-Sensing & https://www.cnx-software.com/2022/08/08/esp-wifi-csi-detects...
> Espressif claims it can also capture subtle movements caused by small movements such as breathing and chewing of people or animals in a static environment.. works with all ESP32 series microcontrollers including ESP32, ESP32-S2, and ESP32-C3, and does not require any changes to the hardware
2024 AI/NPU laptops with Wi-Fi 7 from Intel and Qualcomm can combine RF radar and on-device inference to identify human activity.
Related:
DIY Radio Telescope: Building a Camera That Can See WiFi (2019) https://www.youtube.com/watch?v=g3LT_b6K0Mc
Wi-Fi devices set to become object sensors by 2024 via IEEE 802.11bf standard (2021), https://news.ycombinator.com/item?id=40458766
How automotive radar measures the velocity of objects (2024) https://news.ycombinator.com/item?id=40768959
How Wi-Fi sensing of movement became usable (2024) https://www.technologyreview.com/2024/02/27/1088154/wifi-sen...
Re: Inside a $1 radar motion sensor
#3Reminds me of the HB100 teardown, but at least this one has an IC to make it more soothing that I don't really understand how it all works. https://www.allaboutcircuits.com/news/teardown-tuesday-hb100...
Re: Inside a $1 radar motion sensor
#4MCU rp2040 from Pi Pico also costs 1$. We really are in great time for affordable hacking
Re: Inside a $1 radar motion sensor
#5Reminds me of the HB100 teardown, but at least this one has an IC to make it more soothing that I don't really understand how it all works. https://www.allaboutcircuits.com/news/teardown-tuesday-hb100...
Too fantastic not to submit: https://news.ycombinator.com/item?id=40834960
Re: Inside a $1 radar motion sensor
#6Reminds me of the HB100 teardown, but at least this one has an IC to make it more soothing that I don't really understand how it all works. https://www.allaboutcircuits.com/news/teardown-tuesday-hb100...
I don’t know who designed this, but they were a master of the black art of Radio Frequency waveguide engineering. I am impressed. The PCB, itself, is a major component. Not only for the patch antennas but also several RF filters, the local oscillator, and the mixer are all largely made from peculiarly-shaped PCB tracks. Apart from the PCB, there are only five “components" on the board. Five passive components to implement a Doppler radar module. C’mon. You have to be impressed by that!Re: Inside a $1 radar motion sensor
#7Through-wall 2.4Ghz Wi-Fi CSI radar can be done with $20 ESP32 boards, https://github.com/Marsrocky/Awesome-WiFi-CSI-Sensing & https://www.cnx-software.com/2022/08/08/esp-wifi-csi-detects... > Espressif claims it can also capture subtle movements caused by small movements such as breathing and chewing of people or animals in a static environment.. works with all ESP32 series microcontrollers including ESP32, ESP32-S2…
> chewing of people or animals
The ESP32 can detect the difference between a cannibal and a vegan?
That's impressive.
Re: Inside a $1 radar motion sensor
#8I've played with these all the time! Great to know how they work!
Re: Inside a $1 radar motion sensor
#9USB C mm wave "radars" that hook to home automation are a thing.
Priced between 11 and 20 bucks they are fairly feature rich...
If you want to roll your own check out what the folks over at ESP home have going on (google esp home mm wave).
Re: Inside a $1 radar motion sensor
#10The LD2410 (B) is another option and it operates over UART. It is a bit more expensive ~$5 but has more configuration options.