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Inside a $1 radar motion sensor
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Re: Inside a $1 radar motion sensor
#12Through-wall 2.4Ghz Wi-Fi CSI radar can be done with $20 ESP32 boards, https://github.com/Marsrocky/Awesome-WiFi-CSI-Sensing & https://www.cnx-software.com/2022/08/08/esp-wifi-csi-detects... > Espressif claims it can also capture subtle movements caused by small movements such as breathing and chewing of people or animals in a static environment.. works with all ESP32 series microcontrollers including ESP32, ESP32-S2…
> chewing of people or animals The ESP32 can detect the difference between a cannibal and a vegan? That's impressive.
How can you tell someone is a vegan? Don't worry, this 1$ radar motion sensor can tell you.
Re: Inside a $1 radar motion sensor
#13Earlier quoted context omitted.
> chewing of people or animals The ESP32 can detect the difference between a cannibal and a vegan? That's impressive.
How can you tell someone is a vegan? Don't worry, this 1$ radar motion sensor can tell you.
I think you could go cheaper. A sound detection sensor is a bit cheaper, and it just needs to detect the word 'vegan.'
Re: Inside a $1 radar motion sensor
#14Through-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…
Great links!
I recall seeing somewhere that AMEX was investing in WiFi object detection…can’t remember exactly for what or how…
Re: Inside a $1 radar motion sensor
#15A little tangential, but are these things safe for humans? I have a couple of LD2410 devices and I’d like to use one of them with ESPHome in the bedroom. I did some research and they seem to be very low power and safe, but you know, before sleeping with a radar pointing at us all night long, I’m looking for as much feedback as possible.
Re: Inside a $1 radar motion sensor
#16Earlier quoted context omitted.
How can you tell someone is a vegan? Don't worry, this 1$ radar motion sensor can tell you.
I think you could go cheaper. A sound detection sensor is a bit cheaper, and it just needs to detect the word 'vegan.'
Strangely enough I've heard far more people make this "joke" than actual vegans speaking up. Even when living in LA.
Re: Inside a $1 radar motion sensor
#17A little tangential, but are these things safe for humans? I have a couple of LD2410 devices and I’d like to use one of them with ESPHome in the bedroom. I did some research and they seem to be very low power and safe, but you know, before sleeping with a radar pointing at us all night long, I’m looking for as much feedback as possible.
Some phones have a SAR of almost 2W/kg, compared to that milliwatts of 10GHz RF are nothing. Not to mention that with standard energy dissipation formula of E~R^(-2) you're getting into microwatts at any practical distance from the antenna.
Re: Inside a $1 radar motion sensor
#18Through-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…
Wifi sensing is interesting, but you can combine a $3 ESP chip with one of these for a much easier project at lower cost: https://www.dfrobot.com/product-2795.html
I use those for presence detection in my house. 3D print a small case and for < $20 you have highly accurate presence detection that also works when sitting still. Ideal for automatic light and climate control.
Re: Inside a $1 radar motion sensor
#19[dead]
Re: Inside a $1 radar motion sensor
#20A little tangential, but are these things safe for humans? I have a couple of LD2410 devices and I’d like to use one of them with ESPHome in the bedroom. I did some research and they seem to be very low power and safe, but you know, before sleeping with a radar pointing at us all night long, I’m looking for as much feedback as possible.
I have these all around the house, but not in the bedrooms. I use weight sensors to detect that someone is in bed and traditional PIR for motion in bedrooms.
Probably overly careful, but I didn't want to point a radar at my sleeping kids (and myself) for 12 hours per day. Similar for the WiFi access point upstairs, it's only in the hallway and not at maximum power.