IMU Boards Available

[Robo1]

I Bill

Those values sound about right I'm using the same chips in my bot have a look over at www.sparkfun.com in the sensor section. I think your using the ADXL330 and the IDG-300 ?

Or you could just search the web for the data sheets.

Bren

[JonHylands]

There are links to the data sheets of the chips on the Sparkfun pages:

http://www.sparkfun.com/commerce/product_info.php?products_id=741
http://www.sparkfun.com/commerce/product_info.php?products_id=395

The voltages are being read in with a 5 volt 10 bit A/D, so the readings from the 5-axis board don't have as much range as the 1-axis gyro, which is a 5 volt device.

I'm running the 5-axis board at 3.3 volts. The 1-axis gyro board is run at 5 volts.

The 3-axis accel chip is an ADXL330, which is a 3g device. The data sheet says 300 mV per g, which isn't much. I can get values between about 0 and 600 or so from it:



The pitch gyro is an IDG-300, and produces a similar range, although it appears to go up to somewhere between 600 and 700:



Finally, the yaw gyro, which is an ADXRS300, can do the full range, 0 - 1023:



- Jon

[savuporo]

just something i noticed the other day, and might be interesting for you guys : Analog now makes full 6-DOF IMU chips as well, ADIS16350 and ADIS16355.

Works out roughly the same price as Sparkfuns 6-DOF IMUS put together from ADXRS300

[JonHylands]

Yeah, I saw that a few months ago when they had it on their web site. It looks interesting for doing motion estimation, but really overkill (and too big) for inside a humanoid as a balance sensor...

- Jon

[ryann2k1]

Is it 0-1024? Most of the time I get values that hover round the 250 mark (range of 160- 320). After a vigous shake the accelerometer values return although I recieve 91 and 389.
Bill

I just bought a set of 6-IMU board from Jon and the range can be between 0 to 1024.. gives more flexibilities.

cheers,

ryann2k1

[JonHylands]

I'll summarize my big posting above:

The 3-axis accel chip returns values between about 0 and approximately 600 for each axis.

The 2-axis gyro chip (pitch, roll) returns values between 0 and approximately 700 for each axis.

The 1-axis gyro chip (yaw) returns values between 0 and 1023.

- Jon