I have a raspberry set-up as a media centre and I bought a Rii Mini X1 Wireless Keyboard with Touchpad to control it. It is #4 on some list of best wiresless keyboard-trackpad combinations. The thing is completely useless it either misses inputs or inputs keep sttttttttticking. And I am talking about within 2 meters with line of sight.
Looking for smartphone related solutions I'd like to use bluetooth. Wifi has possibilities but there is a lot more work behind it then I like. I am currently using some raspberry forum guy's code with which I should be able to use my phone in combination with a serial communication app. That does not work yet.
Than I membered that the atmega32u4 can output mouse and keyboard instructions. And I have also read that you can load new firmware on an UNO's ttl converter so it can do the same.
Because letting smartphones work with HC-05/06 modules is like the easiest thing you can do and because there are very convenient apps for it. I thought a good solution was to create my own Hc-05 based, usb dongle so I can smartphone-controll the raspberry. Using an entire leonardo for just this purpose is too inconvenient. I have a Cp2102 module lying arround but I believe it's firmware is not suited for mouse/keyboard inputs?
TL:DR version: What is the cheapest/less space consuming way of creating a USB dongle with a USB-TTL converter and HC-05 bluetooth module? Can I change the firmware of a cp2102 to this?
I have soldering skills, so using double-sided tape to stick an SMD chip on a proto PCB and solder emailed wires on the pads is ez-pz ;)