Vext/5v/3.3v power in

#1

Hi.
I’m hoping to power the Wireless Stick I have from another (5V) arduino
(that will be plugged into DC adapter)

In worst case I guess I could use the USB power in, but since the pins above are available was hoping I could safely hook up power to them.

Thanks

#2

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Both 5V or 3.3V can be a input pin.

Refer to this page (Tech Specs part): https://heltec.org/project/wireless-stick/

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#3

Thanks!
However, if I ONLY have 5V from the other arduino, will that still work ?
(its not a normal Arduino, its more of relay shield so I can’t get to all pins)

Seems like Vext assumes 3.3v, so I would need a 5v to 3.3v regulator in that case, or is there a way to use the built in regulator (without hooking up the the USB pins).

#4

Yes, if the output current is over your system need, it’s can work well.

BTW. the Vext is 3.3V output, for low power design, can’t be a input.