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Topic: COM Port / Communication problem (Read 1 time) previous topic - next topic


Hi !
I used in a program the LowPower.sleep. Uploading a new version of the program resulted in communication errors.

I read that the solution is a double click on the reset button. However that did not work in my case.

It seems that you have to do the double click at the right moment:

When you try to upload a new program you will see normally the following messages:


Touching port /dev/cu.usbmodem1D1331 at 1200bps

Set DTR off

Flashing with command:/Users ...


Try to do the double click quickly after the message "Set DTR off" appears. That will be just before the flashing occurs. The flashing will otherwise time out after half a minute or so if the device is in sleep. Doing the double click right now get the device out of sleep - I think !

Good Luck


There were similar issues with the MKR1000.

Maybe there are a few useful threads in that section.
It may not be the answer you were looking for but its the one I am giving based on either experience, educated guess, google or the fact that you gave nothing to go with in the first place so I used my wonky crystal ball.

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