with cheaper 3 axis digital gyros and Accelerometers coming out like the Itg 3200 and bma180, for under $70 it would be possible to make a highly accurate digital imu. (for the prototype, around $50 for a production version, but still cheaper than almost any other imu)
so i started thinking, what format (shield, board, package) would an imu like this be most useful in? the ardupilot is a pretty common board for uavs and it already has an an imu for it, but the arduimu isn't the easiest to integrate or use.
although one of the easiest things to integrate and use is a shield, so an imu shield for the ardupilot should probably have at least 4 things:
- a 3 axis gyro
- a 3 axis Accelerometer
(for the imu)
- a barometric pressure sensor
(for much better altitude reading)
- i2c ports (3.3v and 5 v)
(because i2c is really common)
with this goal in mind I started looking for parts, and after looking around for a bit i found the following main parts.
for the gyro the ITG-3200
is pretty much my only choice
for the accel the BMA180
will be more than accurate enough.
also the BMP085
should be a good pressure sensor,
and for the i2c logic level translation i will have the 296-18509-1-ND
which is the same IC Diydrones uses.
time to create a board,eagle designs should be posted in a day or two
here are the eagle files v1.brd
this is my first eagle schematic except for the eagle tutorial at sparkfun, so please tell me what you think.
also some thing i think is wrong on the board is the header placement for the ardupilot.
do they just look wrong or do they really need to be fixed?
any help on this project would be appreciated.
update; here is the final version of the board:v2.brdv2.sch