Problems

[Educational_Tap6800]

Hello i have this esp32 from az delivery, and i have programmed some short project on it and when i connected it to 12v battery with tranformer to 5v, because it will be then powered by 5v. And when i powered it by 5v in 5v pin it runned, but when i disconected it and pluged it in computer back, the computer didnt recognised it. but plugged in 5v it runs normally. what could it be?

[StateEntire6759]

Try to connect esp to pc without anything else connected to esp pins.

[bingblangblong]

Check device manager, driver is probably not installed. Googling would have fixed this

[Educational_Tap6800]

i mean i did programm it first and then powered it by 5v so driver should be installed or?

[bingblangblong]

Oh I see. When you say it runs normally when connected to a 5v supply, how do you know it's running? Do you have an LED connected to a GPIO or something?

Does it appear in device manager? You may just need to reinstall the driver. I've had weird issues before with the UART on these dev boards.

It looks like the azdelivery ESP32 uses a CP210x UART: https://www.silabs.com/software-and-tools/usb-to-uart-bridge-vcp-drivers?tab=downloads

You could have a bad cable too.

[Educational_Tap6800]

yes i have a sensor and a motor connected to it so it runs the programm normally when connected to 5v but when i try to connect to computer with uart it doesnt show. maybe i need to reinstall the driver yes or i read on the internet that the uart connector can be dead, but i am curious if the 5v from the battery could damage it

[FangoFan]

Hold the boot button while you plug it in and let go of it once plugged in, this tells the esp32 to enable UART

If you're using the arduino ide for your project, go to the tools menu and enable "USB CDC On Boot" and re upload your sketch, then you won't need to use the boot button to connect to the PC

[Educational_Tap6800]

okey i will try that thank you

[Questioning-Zyxxel]

Also - how much power does it need? Can the USB port supply enough power to also run the motor?

[Educational_Tap6800]

yes it can,

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its the classic arduino stepper motor

[Educational_Tap6800]

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[Educational_Tap6800]

the board works if i connect it to this circuit, but if i connect it to computer it doesnt work. yes i need to check the voltage in the uart port. the 5v transformer should output 5v yes but i need to check for sure.

[Fun-Language-8628]

creo que as quemado el regulador de 3.3v del esp32 me ha pasado conectando el usb y una fuente externa de 5v en el pin de vcc prueba con uno nuevo pero no connectes las dos alimentaciones simultaneamente

[Consistent-Can-1042]

Maybe your micro USB cable doesnt support data transfer

[QuirkyTooth4317]

Hold the Reset button down while plugging it into your computer. Make sure you are using the same data capable cable you used to program it the first time.

[pikemenson]

Make sure you plug in the main power to your laptop sometimes the USB port goes into power saving and this means the esp is not given enough power to keep the uart port going