small update about my bluetooth plan:
after studying a lot of specs and sourcecode for the implemetation of software USB host controllers and bluetooth statcks i`m sorry to say that i don`t see any possible way to talk to an USB BT Dongle with any cheap MCU that comes without hardware USB support. It is still possible to have a working USB host implementation for a attiny45/2313 (or any comparable chip), but due to the limited ressources, you can only handle low speed devices (HID class devices for example). The minimal requirement for a normal BT dongle is full speed USB. I have ordered an BTM-222 to let my Arduino talk to an android phone.
while the bTM-222 is still very cheap (~12€), it hurts a little bit because it will double the costs for some of my planned projects :/
so what comes next?
- build an 5x5x5 LED cube
- post an howto for the BTM-222 module
- code an USB host for the tiny45