Crowbar

idahowalker
Posts: 131
Joined: Wed Aug 01, 2018 12:06 pm

Crowbar

Postby idahowalker » Sun Jan 13, 2019 1:11 pm

I power the ESP32 from its own 5V power supply.

If, whiles connected to the computer the voltage regulator that supplies the ESP32 decides to fail, mine did, and a USB cable is plugged into a computer, as mine was, the source of the voltage, in my case 9V, is directly connected to the source computer USB buss, like mine was.

My solution will be to crowbar the ESP32 supply source, 9V.

Mostly though this is just a bit of info.

mrburnette
Posts: 5
Joined: Mon Feb 12, 2018 6:50 pm

Re: Crowbar

Postby mrburnette » Mon Jan 14, 2019 3:07 am

idahowalker wrote:
Sun Jan 13, 2019 1:11 pm
...
My solution will be to crowbar the ESP32 supply source, 9V.
...
A powered USB hub will sacrifice itself and protect the PC.

Ray

permal
Posts: 382
Joined: Sun May 14, 2017 5:36 pm

Re: Crowbar

Postby permal » Mon Jan 14, 2019 9:40 am

My solution will be to crowbar the ESP32 supply source, 9V.
What does that mean?

FreddyVictor
Posts: 8
Joined: Sat Dec 01, 2018 11:34 am

Re: Crowbar

Postby FreddyVictor » Mon Jan 14, 2019 11:41 am

permal wrote:
Mon Jan 14, 2019 9:40 am
My solution will be to crowbar the ESP32 supply source, 9V.
What does that mean?
He/She means to simply short-circuit the 9volt supply !
Not sure I would recommend that since any power source for these chips is going to be able to supply a good amount of current, so who knows what may happen

I'm sure there must be better options eg: re-settable fuse, zener diode etc

idahowalker
Posts: 131
Joined: Wed Aug 01, 2018 12:06 pm

Re: Crowbar

Postby idahowalker » Mon Jan 14, 2019 2:21 pm

Thank you mrburnette for your suggestion. I added in a powered hub.

The crowbar will short the 9V supply causing the fuse to blow and preventing the 9 volts, from a failed voltage regulator, from reaching the ESP32.

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