Here’s a really tiny r/c blimp that doesn’t need several cubic feet of Helium to get off the ground. Instructables user [masynmachien] has been building r/c blimps for over a decade now, and this ...
It's based on the ATmega 328 version: https://github.com/TheDIYGuy999/Rc_Engine_Sound and on bitlunis Halloween example: https://github.com/bitluni/MotionPumpkin ...