Because we want to measure more than just one axis of rotation of our robot this year, we searched out some similar gyros to the one contained in the KoP. The gyro board contained in the KoP is the ADW22307 (
data sheet provided by FIRST) and I found the ADXRS622 eval board on Digikey. The specs for this gyro (
datasheet) are identical to the provided chip, but the packaging is different (anybody who's ever worked with the older Analog Devices chips like the ADXRS150EB knows what I mean).
Analog devices says this is a drop-in replacement for the ADXRS612 (
datasheet for the 612 eval board). The problem is, it is not a drop-in replacement for any of the older gyro models (such as the ADXRS300).
So, here's the issue (aka tl;dr): The schematic says we need to provide 5VDC on AVcc, Vdd, and Vratio, which we have done. The ground planes for PGND and AGND are indeed connected, as shown by the multimeter.
We get the null voltage out (approx 2.53VDC) of the chip no matter what we do to it. Both 622 chips we have do the same thing. Until we hooked 5VDC to the Vratio pin, we got 0. I asked one of our electrical engineers (I'm a software guy, sorry) to check the schematics and see if I was missing anything. He said he couldn't see anything. Heck, we even hooked it to a breadboard and wired the pins the same way to see if it was a bad soldering job while wiring up a socket.
We have been measuring the output using LabView, opening the analog port, reading the voltage in a while loop (with a delay built in) and outputting it to a graph. We have also verified it using a multimeter.
I come hat-in-hand to the Chief Delphi community. I have 2 students who I am teaching inertial attitude calculation and tracking to using this project. But we can't get any measurements out of the gyros.