Hi.
I'm doing a project that makes use of two esp32 and I would like to know if there is a way to power only one of them via USB and the other be power via a pin.
There is this possibility, how can I do it?
Thanks
What type of boards? What does their schematic show?
Supply regulated 5V to the 5V power input pin, if there is one, or supply regulated 3.3V to the 3.3V power input pin.
I don't have the schematic, but there are two esp32 with 30 pins that communicate via Serial2, so they are connected to RX2, TX2 and GND.
If I power one via usb and connect the other via the VIN pin and the other GND, does it work? Is there a need for another GND since I already use one for serial communication?
Which ESP32 do you have?
Typically the ESP32 brings out 2 ground pins.
Supply 5V to Vin. Connects the grounds together.
Post an image of your project.
Do you want to power both from the same USB? Then connect the grounds, and join the 5V pins together.
But - they have radio transceivers in them. So co-location might be an issue.
All good replies. If you are powering a lot on 3.3, I read you can input 7.5 at Vin to keep up with the loads. I saw that while studying ESP32 and addressable LED strings.
I hope you're not suggesting increasing the unregulated applied voltage to compensate for increased processor current demand. That would be exponentially bad because the regulator power dissipation is proportional to the dropped voltage for a given current (and you're increasing the current as well).
If you are powering a lot on 3.3, I read you can input 7.5 at Vin to keep up with the loads.
I hope you're not suggesting increasing the unregulated applied voltage to compensate for increased processor current demand. That would be exponentially bad because the regulator power dissipation is proportional to the dropped voltage for a given current (and you're increasing the current as well).
`The DOIT ESP32 DevKit V1 device summary states:
“The device can operate on an external supply of 6 to 20 volts. If using more than 12V, the voltage regulator may overheat and damage the device. The recommended range is 7 to 12 volts.”
Thank you. One should never apply more than the nominal 3.3v to a a pin designated for 3.3v, period. My frame of reference wasn’t clarified. On the DOIT DEVKIT 1 board, Vin goes to an onboard regulator to power the ESP32 at 3.3v. If Vin is powered with 3.3v, and a load on 3.3v outputs is great enough, the voltage drop could cause a pin to read LOW erroneously.
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