![]() ![]() ![]() An ohmmeter connected to USB ground then to the two pins of the barrel connector in turn should maybe identify which one is ground (making the other the 5V pin). Assuming the USB connector on the device is powered by the device, the ground pin on the USB connector (a USB breakout board would be the easy way to find that) should connect to the 5 Volt ground. Connecting it up backwards will likely blow the device. Usually (but not always) the center pin is positive. Ah! So you have a couple of issues: you need to know how much current it needs (solvable by giving it a supply with too much, as it will only take what it needs) and most importantly to know which pin on the barrel connector is positive. ![]()
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