Yaw rate detection

Archive SparkFun Site Questions/Comments
1

hi!

I know gyros output voltage is not ratiometric but ı want to detect turn angle around the yaw axis. ı can find roll and pitch angel by accl.+gyro+ kalman but I have not been succesful about yaw angle detection yet. please help and idea!

I have arduino Diecimila board+ADXL330 accl.+ EPSON XV8100CB gyro

NOTE: I do not understand fully how to gyro work? For example ı turn gyro so its output voltage increase and returns its zero bias value immadiately.Is this normal for gyro working or my gyro is damaged!

2

No, that is correct, as a gyro measures angular velocity. The faster you rotate it, the more the voltage should change from the zero point, and when you stop it will return to the zero point.

For yaw angle (not yaw angular velocity) you need to use magnetometers, which detect your absolute angle like a compass does. The Oceanserver compasses or the HMC1053 would do, as would the MicroMag3.

3

Thanks for your idea finally the combination like that gyro+magnetometer+kalman filter is useful and effective?And can you give a magnetometer type or brand for better solution?

4

I just told you 3 different types of magnetometers, all available from Sparkfun. For your convenience:

http://www.sparkfun.com/commerce/produc … ts_id=8960

http://www.sparkfun.com/commerce/produc … cts_id=244

http://www.sparkfun.com/commerce/produc … ts_id=7915

You’re going to need a gyro in all three axes to get a full roll/pitch/yaw solution - perhaps get the IDG300 breakout too:

http://www.sparkfun.com/commerce/produc … cts_id=698