Hi @Richu-Bini, The Uart Baud Rate Register (UBRR) is used to set the clock for the UART shift registers and For standard crystal and resonator frequencies, the most commonly used baud rates for asynchronous operation can be generated by using the UBRR settings provided by the AVR Datasheet: AVR306: Using the AVR USART on tinyAVR and megaAVR devices

And you can find the equation from the datasheet to calculate the UBRR values depends on the clock source it has.

8422ea95-2844-483c-8e41-acab03c9ec41-image.png more details at the AVR306: Using the AVR USART on tinyAVR and
megaAVR devices

alt text src: http://www.avrbeginners.net/architecture/uart/uart.html#baud_generator

resource:

https://cache.amobbs.com/bbs_upload782111/files_22/ourdev_508497.html http://www.avrbeginners.net/architecture/uart/uart.html#baud_generator

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All of them are using Arduino IDE and it's libraries, so I think it's makes no difference.

@kowshik1729 Then go with a standard barrel jack, it can handle 6A.

no. we are using jumper for gpio 0th pin. please refer the below image.
freesnippingtool.com_capture_20200721200934.png

@rafitc99
I have developed so many products using Arduino IDE as Programming environment as well I preferred both.. without bootloader hex files and as well with bootloader hex files...

Only the thing is in industrial environment you must have good enough power supply source, extraordinary precautions for noise, emf, loose wirings, current capability of tracks of PCBs, upto mark use of necessary filters, components etc.