How to send arbitrary data by exploiting a function in ESP32's WiFi Stack: https://github.com/Jeija/esp32free80211
Consumer grade WiFi hardware being able to decode down to "femtowatts" of signal strength might be a bit exaggerated, but e.g. the USB WiFi adaptor in this video has a receiver sensitivity of -99dBm @1Mbps which is approx. 100fW. If we count the directional antenna as part of the receiver and add the antenna gain to that figure (this part of the calculation is somewhat disputable), we get the less-than-femtowatts mentioned in the video.
English subtitles for this videos are available, translations are always welcome!
The camera recording code is based on igrr's esp32-cam-demo: https://github.com/igrr/esp32-cam-demo
More speifically, I'm making use of the modified version by Oitzu with OV2640 JPEG support: https://github.com/Oitzu/esp32-cam-demo/commits/ov2640-jpeg-playground
The animations in this video were created using 3blue1brown's amazing manim software (https://github.com/3b1b/manim). Check out some of his mathematical videos on his channel: https://www.youtube.com/3blue1brown
If you like animated math videos, this video of mine might also be of interest to you: https://www.youtube.com/watch?v=joFWr3JzBOI
