The pins on the 2008 gyro are labeled as follows:
G 5 **R** G 5 **T**
B R W B R W
What do R and T refer to? T appears to be angular velocity, from its values.
/David
To anyone struggling with the gyro, here’s what I know:
The second row (B, R, W) refers to the colors of wire (black, red, and white). The G and 5 refer to GND and +5V, respectively.
T is for Twist
R is for Relative Temperature
200 Sensor Manual: http://usfirst.org/uploadedFiles/Community/FRC/FRC_Documents_and_Updates/2008_Assets/Manual/2008_Sensor_Manual.pdf
Really, T is for Temperature, and R is for angular Rate. However, they screwed up the silk screening, so they are flipped.
For those that had good results from the gyro this year, did you use the code in for the temperature calibration?
We used WPILib this year, but did not attempt to incorporate the temperature calibration, and it worked okay, but could have been better
What kind of applications do FIRST teams use temperature for generally?
According to the 2008 sensor manual, the gyro measurements vary with temperature as such:
The “R” output varies by 8.4 millivolts per degree Kelvin. A temperature of 298 K (about
25 Celsius) will give an analog output of 2.5 volts. Higher temperatures will provide
higher voltages. Cooler temperatures will provide lower voltages.
So, you would probably use it if your gyro is mounted in a location where the temperature might be changing a lot. We didn’t use it this year, and just sort of assumed that termperature was a constant. It probably would have been a little accurate if we had used it though.
Thanks for all the help and especially the link to the sensors manual.
/David