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Cortex not working, no robot light lilluminated 
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Joined: Thu Mar 10, 2011 11:26 am
Posts: 6
Post Cortex not working, no robot light lilluminated
The vex net and game light are flashing yellowl. What do we do?


Fri Mar 11, 2011 11:40 am
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Joined: Tue May 15, 2007 9:02 am
Posts: 405
Post Re: Cortex not working, no robot light lilluminated
The most likely cause is a low battery. Try swapping out your battery with one that is fully charged.

If that doesn't work, you may want to try redownloading the firmware files to the robot.

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Jesse Flot
CMU Robotics Academy
ROBOTC Support


Fri Mar 11, 2011 11:42 am
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Joined: Thu Mar 10, 2011 11:26 am
Posts: 6
Post Re: Cortex not working, no robot light lilluminated
we have done all that. When we download the firmware we get a red robot light.


Fri Mar 11, 2011 11:55 am
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Joined: Tue May 15, 2007 9:02 am
Posts: 405
Post Re: Cortex not working, no robot light lilluminated
This is a link to what the LED codes mean on the Joystick and Robot: http://content.vexrobotics.com/docs/Cortex_Joystick_LED_Codes_052010.pdf You should be able to use it to diagnose exactly what the problem is.

It still sounds like you have a low battery. Is it possible that the battery you swapped it with was also low?

I would recommend starting over the Setup process, and following every step - Downloading Master Firmware, ROBOTC Firmware, syncing with the joysticks, and seeing if that resolves the problem.

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Jesse Flot
CMU Robotics Academy
ROBOTC Support


Fri Mar 11, 2011 12:19 pm
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