View Single Post
  #16   Spotlight this post!  
Unread 05-02-2015, 12:43
PhilBot's Avatar
PhilBot PhilBot is offline
Get a life? This IS my life!
AKA: Phil Malone
FRC #1629 (GaCo: The Garrett Coalition)
Team Role: Mentor
 
Join Date: Jan 2006
Rookie Year: 2006
Location: Maryland
Posts: 747
PhilBot has a reputation beyond reputePhilBot has a reputation beyond reputePhilBot has a reputation beyond reputePhilBot has a reputation beyond reputePhilBot has a reputation beyond reputePhilBot has a reputation beyond reputePhilBot has a reputation beyond reputePhilBot has a reputation beyond reputePhilBot has a reputation beyond reputePhilBot has a reputation beyond reputePhilBot has a reputation beyond repute
Re: Got Gyro drift? Try Sensor Fusion !

Hi

On your DEMO Block Diagram you show connecting the VIN pin on the Adafruit board to the +V of a DIO channel.

I'm assuming this is because the power pin on the RoboRio's I2C port is rated at 3.3V and the 10DOF board inputs are VIn or 3.0 V. So you opted to power the raw VIN with 5.0V

However, this means splitting the cable into two connector areas.

Reading the spec on the Adafruit page,

https://learn.adafruit.com/adafruit-...nnecting-it-up

.. it looks like we should be able to power the board from the I2C power pin.

Is there another reason for not taking this simpler wiring approach?

It says:

----------------------------------------------------------------------------
3V3 Setup

If you are using an MCU or board with 3V3 logic (instead of the 5V logic used by the Arduino Uno), you can still power the 10-DOF with the VIN pin or you can use the 3Vo pin, which will bypass the on-board 3V3 regulator and level shifting:

Connect Vin or 3Vo on the breakout to the 3.3V supply on your target MCU
Connect GND on the breakout to GND on the target MCU

Like other breakouts on Adafruit, the 10 DOF Breakout is fully level shifted, and you can safely use it on 3V3 or 5V systems.
----------------------------------------------------------------------------
__________________
Phil Malone
Garrett Engineering And Robotics Society (GEARS) founder.
http://www.GEARSinc.org

FRC1629 Mentor, FTC2818 Coach, FTC4240 Mentor, FLL NeXTGEN Mentor
Reply With Quote