Handheld Capacitive Wall Scanner With Raspberry Pi & Touchscreen

This is a handheld capacitive 2D imager that can "see" into surfaces like walls, floors, furniture, etc! It's kind of like a high-tech stud finder for identifying what's inside your wall! The original creator of this technique is @optisimon, his video can be found here: https://www.youtube.com/watch?v=j5DztX6e-d8 and more info is on his website here: http://optisimon.com/raspberrypi/touch/ft5406/2016/07/13/raspberry-pi-7-inch-touchscreen-hacking/ I made some modifications to the code so it would work better as a standalone handheld unit. My write-up and code can be found here: https://saveitforparts.wordpress.com/2021/12/02/handheld-capacitive-scanner-wall-x-ray/ Please note that you need a Raspberry Pi official 7" touchscreen with an FT5406 chip. The newer FT5426 and other chips won't work! I had a very difficult time tracking down this somewhat older model screen! As a quick overview of some of the steps I took to get this working: -Installed Rasbian Stretch (newer Rasbian versions didn't work) -Enabled Full KMS for external HDMI screen -Followed the Readme files on Optisimon's page for configs etc. -Changed SDLWindow.hpp column iteration -Changed zoom level from 40 to 50 in SDLEventHandler.hpp -Made a shell launch script with xdotool calls for keystrokes -Added a startup .desktop entry. (Full writeup is on saveitforparts.com).