Hi.
What’s exactly the error that you’re getting?
Regards,
Sara

esp32 is rebooting

Hi.
I’m sorry. But I don’t understand. 
Are you facing the same issue as described in the other issue?
You need to provide more details. Otherwise, I won’t be able to help you.
Regards,
Sara

It somewhat depends on what development work you are doing. I was doing camera stuff so bought a few different ESP32-CAM boards. I was also thinking about displaying some stuff so ordered one with an OLED display. Now I’m thinking about touch screens but have not decided what type yet (Capacitive or Resistive).
 
What type of development work are you doing?

@steve : I am using this for learning purpose.
@sara: My board is rebooting after flashing code. It is not connected to wi-fi. I have develop code to connect pythonanywhere.com. sender & receiver
case-1: if i put sender code, it is connecting to wifi & signal is going to cloud. It means, board wi-fi is working
case-2: if i put receiver code, it is rebooting. code size is same as sender
What can be possiblities of error? 
No devices are connected. 
Timer is not used. simple code

That sounds like a power issue. Is the board connected via USB to a laptop PC? Check the specs of the PC to see the max current the USB ports can deliver. Some are set to 200mA and the ESP can ask for more than that especially for WiFi.

Yes. board connected via USB to a laptop. I will give power supply 3.3V from power adapter & update this answer

I want to use USB power supply. which is perfect one? 

Hi.
 
I’m not familiar with the software you are referring to.
When the ESP32 reboots constantly, that might also mean that there’s something wrong with the code.
 
If you want to power the ESP32 via the USB port, you can use a wall power adapter like those that come with smartphones or a power bank (for testing purposes).
 
Regards,
Sara

The problem with that idea is that you would need to flash the code, then disconnect from the laptop and plug in the external power supply. At that point you won’t see anything that prints to the serial port. If you need to do that you could use a board with a built-in OLED display or an external display (Although that involves soldering a bunch of pins).

You may be better off using a powered USB hub. They can normally provide at least 500mA per port.

Thanks. Which (5V or 3.3V )supply needed for USB port from  wall power adapter

Hi again.
For USB port, provide 5V.
Regards,
Sara