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Xinyuan-LilyGO / LilyGo-T-PCIE

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Powering from 5V pin whilst debugging via USB #23

Open ntsewell opened 2 years ago

ntsewell commented 2 years ago

Hi! We are developing a product around the LilyGo-T-PCIE board and wish to confirm whether it is possible to power board from the 5V pin whilst at the same time having the USB-C connected to a computer for debugging / monitoring. Given the dev nature of this board it would seem sensible to be able to do this, but we want to confirm.

Thank you!

randybb commented 2 years ago

Based on the last page of schematic https://github.com/Xinyuan-LilyGO/LilyGo-T-PCIE/blob/master/schematic/T_pcie_v1.1.pdf there are no protection diodes, so no.

ntsewell commented 2 years ago

That's what we thought too... shame, it would be a useful and very cost effective addition! Thanks Randy.

carlosprato1 commented 2 years ago

As @randybb says, it does not have protection diodes, maybe it works to place them on the usb cable and on the power supply. something like that: sources_diodes .

I got the image from this page:

maybe one day I'll try it in the meantime I'll keep disconnecting the source to connect the USB on the board.

mereshow commented 2 years ago

Hi! We are developing a product around the LilyGo-T-PCIE board and wish to confirm whether it is possible to power board from the 5V pin whilst at the same time having the USB-C connected to a computer for debugging / monitoring. Given the dev nature of this board it would seem sensible to be able to do this, but we want to confirm.

Thank you!

I do it often with no problem. I use a laptop connected to the same electrical circuit as the esp32 power source, or use the laptop unplugged (battery only).

ntsewell commented 10 months ago

Hi! We are developing a product around the LilyGo-T-PCIE board and wish to confirm whether it is possible to power board from the 5V pin whilst at the same time having the USB-C connected to a computer for debugging / monitoring. Given the dev nature of this board it would seem sensible to be able to do this, but we want to confirm. Thank you!

I do it often with no problem. I use a laptop connected to the same electrical circuit as the esp32 power source, or use the laptop unplugged (battery only).

I meant to say thank you for your comment about this - we also do this all the time now so it is safe it seems! :)