Best way to connect ITG-3200 & BMA-180 to Mega board ?

[Ebi]

Hi,

I'm moving from WMP & 5DOF IMU (analog accelerometer from Sparkfun).
To ITG-3200 & BMA-180 all breakout board from Sparkfun.

I'm thinking of 3 possibilities to connect it to my Mega board.

1) Connect the 2 sensors to 3.3v and disable the Arduino pull-up (sensor always powered).
2) Connect the 2 sensors to a 3.3v comming from a voltage regulator powered by pin 12 and disable the Arduino pull-up.
3) Use a LLC and power the 2 sensors to a 3.3v [from voltage regulator powered by pin 12]

What would you recommend to me, I need the most reliable solution
I will carry lots of equipment for aerial photography, with this tricopter
http://wbb.multiwii.com/viewtopic.php?f=9&t=76...

Is there any reason to power the ITG-3200 & BMA-180 through pin 12 ? Is it possible to have it freeze ? The Pin 12 powered solution works to "un freeze the WMP will it work for ITG-3200 & BMA-180 ?

If possible I would greatly appreciate if someone could check the connections diagram I've joined.

Both ITG-3200 & BMA-180 are Sparkfun Breakout board.

Thanks a lot,

EBI

[Alexinparis]

I would say a mix of 1) and 3):
option 4) Use a LLC and power the 2 sensors to a 3.3v (sensor always powered), arduino pullups enabled

PIN12 is useless without a WMP, I've never seen freeze states on other I2C devices

[Ebi]

Thanks a lot Alex for your quick reply.

I will do it the way you sujested it. Use the Sparkfun LLC and permanently power the sensors (not use pin 12).
Hopefully will post nice aerial's photography soon

Using the LLC I will avoid the risk to load by mistake one day a firmware with pull-up enabeled and fry the sensors

Happy flying to you,

EBI

[rihardsb]

Dear All,

With the reference to

Has anybody tried to connect IMU Digital Combo Board - 6 Degrees of Freedom ITG3200/ADXL345 from Sparkfun
http://www.sparkfun.com/products/10121
through LLC to Arduino Pro Mini?
Unfortunately I couldn't get it working with Multiwii preter v1.7. Should I change I2C addressing or any other advice?!

Best Regards,
Rihards

[miniquad]

For Sparkfun breakout boards for ITG3200 gyro, the address is set to D2 by default. You can try that address and should work.

[ynojal]

Hello,

I've got a ARDUINO Nano V3.0 with 3.3V and 5V + Expansion Shield




Can I plug the two board (BMA180 + ITG 3200) directly to the shield with 3.3V or do I need the level converter board ?



Best regards ...

[Drifter]

Rihardsb, That is what they use on the Aeroquad Mini Shield. I have one with Multiwii 1.7 running in my Tricopter.
Only one flight so far and not sure if acc's are working or not.