IMU Contact Test


#1

Hello Everyone,

I recently did the v2.6 end cap upgrade which required rebuilding the main wire bundle. I cannot read data from the IMU. When I did contact testing all the IMU pins on the DB-25 connector read as a shorted circuit. Is this normal for the IMU or did something go horribly wrong somewhere?


#2

Sounds like something went horribly wrong. If the pins are all shorted together, then if you install the IMU you'll be shorting out the ROV +3.3V power system, which will bring down the rest of the ROV as well. It probably won't do any permanent damage to the rest of the ROV, though I wouldn't leave it this way for an extended period of time.

Reading this makes me realize that, on the next revision of the Controller Board (2.7), I should put a polyfuse on the 3.3 V supply running out the endcap, so that a short-circuit there doesn't bring down the rest of the ROV.

-Walt


#3

Exactly what happened to me during build & initial boot. Resistance over GND/+3.3 was zero and the board didn't boot. At one point this fried the BBB although its unclear if that was me or the ROV.....

/RS