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IEEERobotics / bot

Robot code for 2014.
BSD 2-Clause "Simplified" License
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LIDAR Squirrels and Other Problems #438

Open adwiii opened 8 years ago

adwiii commented 8 years ago

After a lot of successful work with the LIDAR before break, we came back to find that it is no longer giving us location data. Last week we were able to send and receive commands with the LIDAR , though most of them failed. Notably, the "Wanderer" command, according to the XV-11 Hacking wiki the command is supposed to result in an ASCII art squirrel followed by "SUCCEEDED": .-"""-. .-"""-. /,:;;:; ,'=. \ : ;:;:;' .=" ,'_\ ; : ':;:;,/ ,_:= ; \ ';;:; =./) / ."= )".' . `'".' . .' `.'

SUCCEEDED

When we ran this command we got this lovely picture and message: squirrel Which has the message at the bottom "SQUIRREL CONTAINMENT FAILED"

We have no real knowledge of what could have caused this. We opened up the LIDAR and found this: lidar board The FET in the picture looks blown, which might be the issue.

SeanKetring commented 8 years ago

Any chance you can pull a part number off of that?

AhmedSamara commented 8 years ago

I couldn't tell in person, it looks like the part numbers are cleaned off, but I found a BOM for the XV11.

However this might be a different version, because the U5 in this one is A3950 motor driver which has a totally different footprint.

AhmedSamara commented 8 years ago

Is there any way to figure out what revision of the PCB ours has? They have a few different versions on it.

I can't be sure, but a similair part on the other PCB's that looks like it could fit here is NC7SZ14.

adwiii commented 8 years ago

Upon further investigation, the board Ahmed kinks above are for the main board of the neato itself, not the lidar. We found someone else who did a teardown of the same board as ours of the lidar. http://diydrones.com/m/blogpost?id=705844%3ABlogPost%3A1591235 From that we can see the revision of board we have. The broken part of our board is labeled PHUI on that board, we are looking into seeing if we can find that part online.

tvbarnette999 commented 8 years ago

We found the datasheets for two parts made by TI that have the same labeling on the outside of the chip and the same footprint. We could request a free sample from TI since they are normally sold in minimum quantities of 250. Idk if that is something we could look into.

http://www.ti.com/lit/ds/symlink/tps793.pdf http://www.ti.com/lit/ds/symlink/tps730.pdf