Cortex Microcontroller and VEXnet Joystick User Guide
Page 10 of 14
Is the
Game LED
flashing?
Do all
LEDs
flash Red in a
repeating
cycle?
Is
Cortex
VEXnet LED
on?
Is the
Robot LED
blinking?
Fast
or slow
blink?
Is the
VEXnet LED
green?
Does
the Cortex
turn on?
Start
Single
or double
blink?
Do all
motors work
correctly?
Are you
having trouble
running your
competition
autonomous
code?
Is the
Robot LED on
the Cortex
consistently
red?
7. General Robot Troubleshooting Flowchart
Check batteries and power connections. The battery connectors on
the Cortex can become bent open over time. If necessary, bend the
connectors back in to ensure a solid power connection.
Low or missing 9v backup battery.
If in a competition setting, install a
fully charged 9v backup battery before
continuing
Programming error. Try switching to
the Default Code which can be found
within your programming software. If
this xes the issue, return to your user
code and attempt to isolate the issue to
a particular line of code. The best way
to do this is to comment out various
sections at a time and test after each
change.
If the units are still not correctly linked, refer to the
VEXnet Troubleshooting Flowchart in Section 8.
Robot battery is dead.
Charge or replace batteries
before continuing.
Fast
Single
Double
Slow
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
Update the VEXnet Firmware (Master CPU Firmware
for ROBOTC users) on both the Cortex and the Joystick
using the Firmware Upgrade Utility included with your
programming software. If you do not have programming
software this utility is available on the Downloads page
at vexrobotics.com.
The Cortex is currently running an Autonomous Only
user code. If you want to use the VEXnet Joystick,
download a VEXnet Enabled project such as the Default
Code using the USB A-A Cable.
When programming a competition robot, it’s very
important that you write your code in a competition
template so that the Field Controller will be able to
correctly enable/disable your robot. Note: during
autonomous the VEXnet Joystick is disabled.
For any other issues, you can refer to the other guides or post a question on the
VEX Forum (vexforum.com). You can also contact VEX Technical Support by
for programming questions contact the developer of your programming software.
Wait 20 second…
Refer to the Motor Troubleshooting Flowchart in Section 9.
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