Hi, I wanted to assembly joystick according to your project. I'm having a problem with the driver. It compiled, but the device is still not available. Maybe I did something wrong, help me figure it out please.

Hi,
I like the design of the board, but I was thinking I could free up 2 more IO pins from arduino if I used the RX/TX instead of i2c to talk to pi, and this would also allow me to write the "firmware" from pi, and allow other styles of firmware like firmata (keep logic in the driver, and the Arduino is just used for it's GPIO.) Do you have any opinions on this? Am I wrong about this as an alternative?

Great project!

I like to see schematic/PCB without loading it up into a viewer. It can be really nice just right in the README file. If you are interested, I can PR for these in README:

I made these in altium viewer

I'm not the most adequate with Arduino and it's code, so I can't fully figure it out, though it seems to be a false value reading. the line of code it refers to is at the very end.

i2c_gamepad.ino: In function ‘void requestEvent()’:
i2c_gamepad.ino:346:64: error: invalid conversion from ‘char*’ to ‘const uint8_t* {aka const unsigned char*}’ [-fpermissive]
In file included from i2c_gamepad.ino:1:0:
/usr/share/arduino/libraries/Wire/Wire.h:61:20: note: initializing argument 1 of ‘virtual size_t TwoWire::write(const uint8_t*, size_t)’
virtual size_t write(const uint8_t *, size_t);
^