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I have been using the following power supply with the RIoTboard:
As you can see from the description, it has a DC barrel plug (5.5 x 2.5mm;center positive)
I want to power my RIoTboard using an "USB to DC Barrel Jack Power Cable", but I did not find the dimensions or polarity of the barrel jack connector of the RIoTboard. Could somebody help me with the dimensions and polarity, or where can I find them?