there is some abbreviation I want to know about it,
what is Tx , Rx led is used for ,
what is 16U2 USB - to - Serial converter
and what is I^2C,
and USART ?
, thanks in advance.
Tx == transmit
Rx == receive
LED == light emitting diode
USART == universal synchronous/asynchronous receiver/ transmitter
I2C == inter integrated circuit.
I' m not going to comment on USB to serial converter.
The Tx and Rx led indicate activity on the USART/Serial for Transmit and Receive
The "16U2 USB - to - Serial converter" is a Atmel ATmega162 programmed to act as a USB to serial bridge.
I2C is a bus to which you can connect all sorts of devices like ADC's, displays, DAC's etc
USART is Universal Synchronous/Asynchronous Receiver/Transmitter. On a Arduino usually used as a TTL Serial device ad by default connected to the computer via the usb-serial converter (the 6U2 on a Uno)
A little Google could have helped you a lot...
Rx,Tx LEDS are for USART0 (serial port 0) activity indication.
ATmega16U2 is just converter USB/serial. It allows connect the Arduino to PC's USB port and program it via serial port. It is the simplest way for programming.
I2C is communication bus for communication between MCUs, e. g. in Arduino world it is frequently used for Arduino - LCD communication.
USART(Universal Synchronous and Asynchronous serial Receiver and Transmitter) - simply serial interface (port).
USART is a ghastly acronym, its the hardware serial interface on the microcontroller. Serial meaning asynchronous serial as in RS232 and many other standards. It is connected to pins D0(RX) and D1(TX)
on the Uno. The Arduino Mega has 3 more hardware serial units BTW.
One the Uno pins A4 and A5 form the I2C bus, ie you lose two analog inputs if you are needing
to use the I2C bus.