ANNOUNCEMENT: Analog Devices FIRST Sensor Donation

[CardcaptorRLH85]

Is there any information anywhere concerning which SPI port the Accelerometer and Gyro use? I know from the RoboRIO documentation that there are four total and I know that the board just uses CS0 and CS1 but which is which?

[Peter Johnson]

Originally Posted by CardcaptorRLH85

Is there any information anywhere concerning which SPI port the Accelerometer and Gyro use? I know from the RoboRIO documentation that there are four total and I know that the board just uses CS0 and CS1 but which is which?

The default constructors in wpilib use the correct ports. The ADXL362 accelerometer is on CS1, the ADXRS450 gyro is on CS0.

For more details, the full board schematics are here: https://github.com/juchong/FRC-Gyro-...RevB%20SCH.pdf

[chadr03]

Is there a cable that can be used to extend the accel and gyro away from the roborio? We would like to use this, but our design has the rio in a vertical orientation and it would be a challenge to move. If we had a cable that would allow us to position the gyro as needed that would be great.

I just have not been abe to find any kind of a 8 pin SPI cable online, but I'm probably just not looking for the right thing.

[Peter Johnson]

Originally Posted by chadr03

Is there a cable that can be used to extend the accel and gyro away from the roborio? We would like to use this, but our design has the rio in a vertical orientation and it would be a challenge to move. If we had a cable that would allow us to position the gyro as needed that would be great.

I just have not been abe to find any kind of a 8 pin SPI cable online, but I'm probably just not looking for the right thing.

The connector is a 10 pin 0.1" pitch IDC ribbon connector, and you need 0.05" pitch 10 conductor ribbon cable. Look at DigiKey parts ED10500-ND (female connector), MPK10K-ND (male connector), and AE10G-5-ND (5' ribbon cable). Even easier, DigiKey also sells premade assemblies such as H3AWH-1018G-ND (1.5') and H3AWH-1036G-ND (3.0').

Also worth noting is the fact the sensor is a 3-axis one, so you could vertically mount it (if it's rigidly mounted and actually vertical) and just read different axes.

[chadr03]

Thanks that is exactly what I needed and would have never known what to look for.

[CardcaptorRLH85]

Originally Posted by Peter Johnson

The default constructors in wpilib use the correct ports. The ADXL362 accelerometer is on CS1, the ADXRS450 gyro is on CS0.

For more details, the full board schematics are here: https://github.com/juchong/FRC-Gyro-...RevB%20SCH.pdf

Thanks! I was looking for a document like that but, I couldn't find it.

[Bryscus]

These are both pretty cool! The FRC Gyro & Accel board is working pretty well for our needs so far.

Any idea where one could buy a spare or two? Thanks.

- Bryce

[feverittm]

I am looking for a little advice on the 16448 IMU board.

When we first got it we tested things and it seemed to be working as expected (the IMU SmartDashboard widget would move correctly with motion of the IMU). Now that it is install on the robot, it seems not to respond the same. We get what appears to be a rate return instead of a position. The z angle changes as we spin the robot (our robot spins in circles really well), however when we stop the angle returns to 0. It appears like it is tracking the rate and not angle.

Does anyone know of a failure mode where this would happen? Any suggestions?

Thanks

[camtunkpa]

Is there any way outside of FIRST choice we can get the ADIS16448? Our FIRST choice credit are long gone and would like upgrade to the ADIS16448 for some more complicated autonomous routines.

[juchong]

Originally Posted by Peter Johnson

The connector is a 10 pin 0.1" pitch IDC ribbon connector, and you need 0.05" pitch 10 conductor ribbon cable. Look at DigiKey parts ED10500-ND (female connector), MPK10K-ND (male connector), and AE10G-5-ND (5' ribbon cable). Even easier, DigiKey also sells premade assemblies such as H3AWH-1018G-ND (1.5') and H3AWH-1036G-ND (3.0').

Also worth noting is the fact the sensor is a 3-axis one, so you could vertically mount it (if it's rigidly mounted and actually vertical) and just read different axes.

Thanks for providing the part numbers! You're correct about the accelerometer providing triaxial output, but the ADXRS450 gyroscope only outputs a single axis (Z when mounted horizontally).

Originally Posted by Bryscus

These are both pretty cool! The FRC Gyro & Accel board is working pretty well for our needs so far.

Any idea where one could buy a spare or two? Thanks.

- Bryce

Great to hear!

Originally Posted by camtunkpa

Is there any way outside of FIRST choice we can get the ADIS16448? Our FIRST choice credit are long gone and would like upgrade to the ADIS16448 for some more complicated autonomous routines.

Unfortunately we're not able to provide any additional IMU or Gyro/Accel boards. The only boards available today are the ones in FIRST Choice stock. These sensors were donated to FIRST by Analog Devices and cannot be sold since that would breach our agreement. There are plans to have more sensors made available to teams in future seasons, but unfortunately the only way to get an IMU or Gyro/Accel board is to purchase it with FIRST Choice points.

[juchong]

Originally Posted by feverittm

I am looking for a little advice on the 16448 IMU board.

When we first got it we tested things and it seemed to be working as expected (the IMU SmartDashboard widget would move correctly with motion of the IMU). Now that it is install on the robot, it seems not to respond the same. We get what appears to be a rate return instead of a position. The z angle changes as we spin the robot (our robot spins in circles really well), however when we stop the angle returns to 0. It appears like it is tracking the rate and not angle.

Does anyone know of a failure mode where this would happen? Any suggestions?

Thanks

Hi! You may be accessing the raw sensor outputs instead of the integrated sensor outputs. If you're using LabVIEW, you'll want to access the sensor using the Gyro Angle or AHRS Angle vi's.

[Bpk9p4]

My team currently uses the ADXRS450 this season and we loved the performance.

I talked to some teams at worlds that used the ADIS16448 and had really good success with this. We are really wanting to try this sensor out for off season project. Does anyone by chance have a spare one for sale now that the season is done?