USB + Vin 6v at the same time

nielodanielo
Posts: 2
Joined: Sat Oct 10, 2020 4:03 pm

USB + Vin 6v at the same time

Postby nielodanielo » Sat Oct 10, 2020 11:53 pm

Hi everyone!

I'm building a robot using ESP32 devkit v1 DOIT and its servos are powered by a battery that gives 6v (7,4 lipo battery through converer).

To not to add an extra converter to get 5v (more weight, more complexity), I'm planning to power the ESP via Vin with the 6v supply (as far as I know, there's no problem with this setup), but I need to debug with the usb plug connected, so here it is the question:

Is it SAFE to connect the USB to a computer AT THE SAME TIME with the Vin connected to a 6v battery power supply?

I'm a programmer, noob in electronics, so be kind...

ESP_Sprite
Posts: 4011
Joined: Thu Nov 26, 2015 4:08 am

Re: USB + Vin 6v at the same time

Postby ESP_Sprite » Tue Oct 13, 2020 3:20 am

Assuming that this is your devboard and these are the schematics for it, you should be good; D1 blocks the Vin power flowing back to the USB port.

Spile2
Posts: 10
Joined: Tue Sep 22, 2020 8:39 pm

Re: USB + Vin 6v at the same time

Postby Spile2 » Tue Oct 13, 2020 6:52 am

From what I have read 6v from a battery should be easily be within specification.

nielodanielo
Posts: 2
Joined: Sat Oct 10, 2020 4:03 pm

Re: USB + Vin 6v at the same time

Postby nielodanielo » Sat Oct 17, 2020 4:06 pm

ESP_Sprite wrote: Assuming that this is your devboard and these are the schematics for it, you should be good; D1 blocks the Vin power flowing back to the USB port.
That's my exact model, thank's so much!
Spile2 wrote:
Tue Oct 13, 2020 6:52 am
From what I have read 6v from a battery should be easily be within specification.
Great, I just wanted to be sure.

Thanks both!

Spile2
Posts: 10
Joined: Tue Sep 22, 2020 8:39 pm

Re: USB + Vin 6v at the same time

Postby Spile2 » Sun Oct 18, 2020 5:29 am

When I inadvertently powered this board by USB and 5vIn, the board stopped working. Led light displays , com port registers but processor gets very warm and communication is not possible. I have had to write the hoard off.

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