How to supply 5V to GTS

[jwakeman]

I've attached a quick representation of how we have the geartooth sensor wired at this point. It is working but I'm not sure if it is the proper/legal way to do it. To describe in words we are running 5V that usually supplies the camera to the PWR and (-) pins AT THE END of the Digital I/O bus on the sidecar. Once 5V is applied there the PWR and (-) pins have 5V on them all the way up the Digital IO bus and we then connect the 5V,GND,S pins from the GTS to one slot on the Digital I/O. I think the picture describes it better (thats why i made it). All comments are appreciated!

[Joe Ross]

When the digital sidecar is properly powered, there is already 5v on the DIO pins. Your connection to the camera supply is unnecessary, and probably harmful.

If you were not getting 5v on the DIO pins prior to making the camera connection, then you should verify the power wiring to your digital sidecar.

[jwakeman]

Your answer does not surprise me. If I recall correctly we were not getting 5V on the DIO pins and that's why we went to the hack. I will confirm again when I have access to the robot that there is not 5V on the DIO pins. Is hooking up the 12V all that should be required to get 5V on the DIO pins? We have had the RSL disconnected. Would that effect the 5V distribution? I know when we connect the light back up it does flash (thats why we disconnected it). Thanks!

[Joe Ross]

Yes, the 12v connection is the only thing required to get 5v on DIO pins. The RSL uses 12v and should not affect the 5v power pathways at all. My suggestion is to disconnect everything other then the 12v power input (eg the 37 pin cable, RSL, all PWM and DIO cables, etc) and verify that all three power LEDs are brightly lit and that you have 5v on the DIO middle pin. If the 5v light is not lit, then the 5v regulator is damaged. If power is good with everything disconnected, connect things one at a time to determine what is causing the problem (likely a short).