Arduino: Disable auto-resetΒΆ

To disable the automatic reset of the Arduino board upon serial connection, just stick a 120 Ohm resistor between the RESET and +5V pins.

This is especially useful when the running application is expected to communicate over serial port, and thus you don’t want a reset each time a connection is made.

In order to be able to upload your sketches again, simply unplug the resistor during the upload, or follow this procedure:

  1. Keep pressed the S1 switch on the arduino board
  2. Click upload / use the usual command to upload the firmware image
  3. Once you see the RX LED blinking, release the S1 switch.
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