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Wednesday, August 15, 2012

TI-84+ bluetooth-capable using an RN-42 module and an Attiny85

I found this Article fascinating. Even though, I doubt that I could even learn how to use such a device...

Don

Blue TILP

Blue TILP » hackniac

Apr 092012
 

I’ve made my TI-84+ bluetooth-capable using an RN-42 module and an Attiny85. It now shows up as an bluetooth SPP to any nearby bluetooth-capable devices, but looks completely normal (at least on the outside). The system allows the calculator to be communicated with over bluetooth as if there was a normal direct wired connection to it. The calculator just sees data coming in as if it were being sent from another calculator or a PC. It still allows the calculator’s link port to be used normally.

I plan on using my calculator’s new wireless linking ability to give it super-powers. So far I’ve only used it in a simple chat program, but eventually it will give my calculator the ability to explore complicated 3D graphs and have integrated WolframAlpha access, among many other useful things. It’s great advantage lies in its ability to turn my calculator, which by now is almost an extension of my own body, into an interface to any other bluetooth-capable device I want to use it with.

The Hardware

The Attiny85 that serves as the brain of the project has been put into a rather odd configuration. I bent half of its pins across its bottom so that it could be soldered to a 2×4 male header. Doing this makes it into a plug that can be disconnected for programming and then easily plugged back into the female header inside the calculator. Through that header the Attiny85 is connected to the ring and tip lines heading to the TI link port on my calculator, to the reset and serial lines of the bluetooth module, to 3.3v and to ground.

Read More...
http://www.hackniac.com/blog/?p=1139


TI-84+ bluetooth-capable using an RN-42 module and an Attiny85
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