Can I power the Redboard Arduino board (basicly the same as Arduino Uno) from the + 12 V output from my ATX power supply? The specifications says the input voltage needs to be at least 7 V.
Is there anything I haven't thought of?
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Many ATX supplies require a minimum load on every rail before they can maintain regulation. Verify that the supply you have doesn't require this, or alternatively put a high-power, moderate-to-low resistance between each rail and ground to allow the PSU to work properly.