Hi everyone,
Recently, port 1 (2-wire) has been acting up on our cortex. Two days ago, these problems started after we noticed the faint but unmistakable smell of fried electronics. We originally attributed this to the VEXnet key as we had been having issues with it, and upon inspection, it felt very warm. A firmware update has solved these issues.
Later we tried to use the motor in port 1 again and realized that it refused to turn backwards. We looked for anything obstructing it and could not find anything. Then we plugged the motor in to a variable benchtop power supply and it worked fine. We took a multimeter to the brand new 2-wire extension cable we had been using and noticed that the port was outputting 6.2V while the mirror of this port (both on the robot and in code, port 10) was outputting 0V. Forwards, the suspect port outputs 2.3V while the mirror outputs 7.3V, and backwards the suspect outputs -7.3V while the mirror also outputs -7.3V. With this information, we believe that somehow we fried the motor controller in port 1. What would you guys recommend we do about this? Or is there a really obvious problem that we are missing that could be solved to fix this issue?
Thanks