The EV3 brick has only four output ports (A B C & D) to run motors. Is there any way to use port 1 (sensor port) to control a motor?

A sensor port can't directly output to a motor. The sensor drivers can't provide enough power to supply a motor.
You have a couple options:

  • Daisy-chain two EV3s together. The first can control the sensors and motors of the second.
  • Use an electronic motor multiplexer. EDIT: It should be noted that this requires an external power supply, which will increase the cost and complexity of your project.
  • Depending on your project, you might be able to make do with only 4 motors. See this response for driving multiple outputs with a single motor.

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