team 804 help needed

[90301]

Originally Posted by eagle33199

A few more things to check. Pull out your multimeter

1. What is the battery voltage at the lug nuts on the power distribution board?
2. What is the voltage the cRio power plug is getting (the "V" and "C" pins)? Is this wired the correct way (with +24V to the "V" and gnd to the "C")
3. What is the voltage the digital side car is getting from the Wago connector? Is this plugged in the correct way (with the + and - printed on the side car)?
4. Does the classmate PC show that it's connected to the cRio?
5. Is the stop button plugged into the classmate? Has it been pressed?
6. Is the robot enabled on the classmate PC?
7. Is the 37-pin DB extension cable between the cRio and the side car firmly seated on both ends. Have you tried a different cable?
8. How are the dip switched set on the cRio?

Also, pictures say 1000 words... taking some pictures of how things are wired (specifically the cRio and digital side car) could really help. A picture of the classmate PC dashboard could also help. Take all the pictures with everything on and enabled.

Will get you those pictures.

1) 12 volts
2) 24 volts but the
3) not sure, but it has worked in the past
4) yes, but this says 00.00 volts
5) yes it is pluged in no it has not been pressed
6) yes
7) yes it is, we also swaped out the cable and sidecar multiple times
8) they are all on.

pictures are coming in the next post.

[Alan Anderson]

Originally Posted by eagle33199

8. How are the dip switched set on the cRio?

Originally Posted by 90301

8) they are all on.

That's a problem. They should all be off (with the possible exception of the console out switch).

[mbailey]

#4 from last numbered post -- we now have 12V signal on Classmate after installing and powering analog bumper. Why is that bumper needed -- well, other than to get the voltage on the Classmate?!

[Mark McLeod]

It's necessary just for the battery voltage feedback.
A lot of things going wrong on a robot are traceable to low battery conditions, especially on the playing field. The field staff monitors robot voltages and notifies teams of bad batteries, low batteries, and non-batteries

Originally Posted by mbailey

#4 from last numbered post -- we now have 12V signal on Classmate after installing and powering analog bumper. Why is that bumper needed -- well, other than to get the voltage on the Classmate?!

[Al Skierkiewicz]

The 12 volt jumper is also the feedback that tells the Crio when the battery is falling to the point the 24 volt power supply will not keep running. The Crio inhibits all output when the power supply falls below 5.5 volts. The 24 volt supply drops out about 4.5 volts. The Crio inhibit is a safety feature to prevent the robot from running by itself.