No one has commented on the post, so I just want to clarify I am 
creating the line-following robot (three wheeler) and following the 
tutorial 
https://www.theengineeringprojects.com/2016/09/line-following-robot-using-arduino.html.
The issue is, I connected the batteries and stuck in the hardware part 
where my batteries are not working. I have designed straightforward 
circuits before so I am afraid I have damaged the ESP32 or batteries.

Thank you so much for the link.

James S. wrote:
> I am new to circuits and electronics. I am creating my first project on
> embedded systems. The project is "Three-wheel car robot with motors,"
> and I connected three lithium-ion batteries with the motor driver.
> The issue was when I was working on the circuit, connected the
> batteries, and soon I noticed the high temperature of the battery
> holders and smoke from the words.
> I think I have added more than the required batteries in the project, or
> the polarities were not right. I used the series connection of
> batteries. What may be the other issue? I have attached the battery
> connection in the attachment.
> Is there anyone here who can discuss all the points about this project?

It seems the issue with your battery connection might be related to 
incorrect polarity or overvoltage from the series configuration. For 
your robotics project, it's essential to ensure that the batteries are 
connected correctly to avoid overheating and damage. Additionally, you 
might want to explore solutions for better battery management and 
protection to prevent similar issues. If you're looking for advanced 
assistance with embedded systems, consider reaching out to Ovaga 
Technologies over https://www.ovaga.com/ here, as they offer specialized 
expertise in electronics design and embedded systems solutions.