hello, i am an mechanical engineer.buying components from ready available is costly for me and there is no learning in that so i decided build my own quadcopter from scratch.i made my own transmitter receiver flightcontroller and frame.if you like foldable frame there is more info on my blog.i used YMFC-32 Autonomous from joop brokking for software and bought ready made esc and motors.more details on my blog
www.diyrj.blogspot.com (http://www.diyrj.blogspot.com)
flightcontroller
(https://1.bp.blogspot.com/-jDFXWCeP3ho/YQU1kKuvO-I/AAAAAAAAAGw/nVLq4c0S6aYc04POA1MPXoyMidxSumDawCPcBGAYYCw/s2048/IMG_20210620_133036.jpg)
transmitter
(https://1.bp.blogspot.com/-fGZvN4zmv7I/YQVnJk5YjzI/AAAAAAAAAH0/WkyAXSYJJIQXoK6LVYNeHOzK9eSqFxLJQCPcBGAYYCw/s2048/IMG_20210727_113536.jpg)
(https://1.bp.blogspot.com/-bCtoGSOYw5w/YQU-QMsXmhI/AAAAAAAAAG8/NQ8HegpizRgBZ8x13aJNPJUD24aQzBxawCLcBGAsYHQ/s2048/IMG_20210727_113801.jpg)
test flight
https://youtu.be/ude8BUbn614 (https://youtu.be/ude8BUbn614)