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Arduino USB powering Arduino and 3.3v device

alexbee13

Hi. Im a newbie when it comes to this stuff but i recently bought an arduino and i was wondering if i could use the arduino cable and splice into it and connect the arduino using standard 5v then add a zener diode on another wire attatched to the 5v wire. Can i do this? I need a 3.3v power source and 5v for the arduino without using 2 usb cables. I know its probably the bad way of doing it. Im just curious to see if i can do it. Its the arduino uno.

 

Thanks

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    One thing being left out, the device you are powering.  How much current will it draw?  The 3.3 output o the arduino is rated for 50ma.  If you need more I can see why you want to use the USB.

     

    I don't recommend splicing into a USB cable, they aren't very easy to work with, all the shielding, the tiny wires etc.  The approach suggested is the best IF you are within the current tolerances of the 3.3V output of the Arduino.

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  • 0

    One thing being left out, the device you are powering.  How much current will it draw?  The 3.3 output o the arduino is rated for 50ma.  If you need more I can see why you want to use the USB.

     

    I don't recommend splicing into a USB cable, they aren't very easy to work with, all the shielding, the tiny wires etc.  The approach suggested is the best IF you are within the current tolerances of the 3.3V output of the Arduino.

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