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Arduino only able to power HC-05 module with USB and DC power

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Torran Dodd

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Torran Dodd

Joined Nov 22, 2017
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I am using an Arduino and a HC-05 Bluetooth module to make an RGB lamp controlled by an app on your phone.
It all works, however something has left me clueless.
I am very much so a newbie to electronics, this is my first ever project, however I still feel I have a good enough knowledge to know this shouldn't happen:

The HC-05 module is powered by the 5V output on the Arduino, which is then powered by 12V DC from the mains. This, however, does not power the BT module (for some reason) but the Arduino is powered. However, when I power the Arduino with USB - it powers them both up! Can someone please explain this to me, as surely when the Arduino is powered (as it is when powered only from the mains) it should power the BT module, but it only powers that with a USB attached...
 
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