Before the MAX31855's show up. So I can afford some distractions. The STM32F3 discovery board I ordered showed up. This board will probably be pretty useful. I still want to do some instruments, and this could be the strap down IRU maybe. It seems to have enough GPIO pins on the board to maybe even be an air data computer by adding a couple pressure sensors to it. It only has USB IO so connecting it to an Android might be a challenge.
I've been listening to the GoogleIO podcasts and the Android library has a nice IO library that allows similar calls for Bluetooth and USB. I think it requires 4.1 though, and may or may not have backward compatibility. I really feel I missed out on this years conference. I don't know why it wasn't even on my list this last year. They gave away a really cool ADK kit that is like an alarm clock, but allows many development options, including demo code for connecting euther Bluetooth or USB.
I figure between the ADK libraries and some demo code for the STM32 discovery board, I ought to be able to connect them together. I need to play with USB hubs though. The physical connectors are either USB minis or USB micros and nothing has a A connector. The discovery board has two USB mini connectors, and the tablets and phones have USB mini connectors. I believe the phones support USB On-The-Go so that should work, but I still need a cable. That is there I think the HUB would work, since I have plenty of A to Mini and A to micro cables.
Sure enough, once you start looking, good things happen! There are A female adapters to mini and micro B connectors, or individual ones. This is going my way now.
Some phones have gyros, and most have compasses with accelerometers, so why have this board in the plane? Few tablets have gyros, and that is what I want in the dash of the plane. The compass may not work in all orientations, or near whatever is in the panel either. Having this board allows placing the gyros and compass in known good locations, and having the air data information integrated will allow any tablet to be used, and know it will work at all times.
I may not finish this in the next couple days, but that is OK. I have plenty to follow up on, and read about and plan. Give me a couple months, and I think I'll have something working.