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I've recently bought an Arduino Pro Mini, the 3.3V and 8MHz version. The first time I powered it, using the VCC pin, all worked. But, as soon as I attempt using the RAW pin instead, nothing lights up... Is my regulator broken ? Or is this a typical issue ?

  • What is the power source you are attempting to connect to the RAW pin? – Majenko May 22 '15 at 20:32
  • @Majenko It's an unregulated 5V source – Spirine May 22 '15 at 20:34
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    Check there is solder on the solder jumper SJ1 – Majenko May 22 '15 at 20:36
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I am not completely familiar with that specific board, but according to the schematic there is a solder jumper which is used to isolate the RAW voltage regulator from the rest of the system "for low power applications".

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I don't know off hand if that comes pre-soldered or not, but check it to make sure it is connected, otherwise the RAW input will do nothing.

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