BTRemote 4/5 Axis, One handed Remote Control Joystick with Gyroscope, Bluetooth, display

As my Spider Robot will not stay the only Bluetooth controlled gadget, and also wanting my 7 year old son to play with it without smartphone, I wanted a small remote control build out of standard components.
After completing I realised that it’s close to the Wii-Nunchuck, but mine has on top:
-Display to e.g. select the Bluetooth drone / controlling options without connecting a PC,
-its free programmable using commonly used arduino IDE,
-having single cell AA Battery to power everything (no burning LIPOs)
So it’s worth to continue this and work on the software steps next
It can be also used to explore new ways to control your existing robots.