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| Arduino pins |
Arduino pin description - The arduino pin configuration is very easy as all the arduino pin and icsp arduino pinout is labelled on arduino uno board.
1. Digital pins
2. Analog pins
Total functional input output(digital/analog) pin of arduino uno is 20.
Arduino digital pins
The arduino uno board has 14 digital pins.But we can get two more input/output pins if we are using ic(atmega328 arduino ic) alone.Its by removing the crystal pins and by using internal oscillator fuses function we can gain these two pins.Its a little complicated.
But arduino uno board as a whole in real world application we have only 14 digital pins.
The pins starting from D0-D13 is known as digital pins.
Analog pins in arduino uno
There are totally 6 analog pins in arduino.
The pins starting from A0- A5 is known as analog pins.
These pins can carry voltage levels from 0-1023.ie, a total of 1024 analog voltage levels
is possible with these pins. These pins are usually used for analog input signal processing.
Arduino uno pin functions
D0 pin - Used as digital input/output function.This pin is also known as serial data receiver pin.
D1 pin - Digital inout/ output pin.This pin can act as serial data transmitter.
D2 pin - Digital input/output pin(i/o), interrupt 0 pin
D3 pin - Digital input/ output pin/ PWM pin, Interrupt 1 pin
D4 pin - Digital i/o pin
D5 pin - Digital i/o pin
D6 pin - Digital i/o pin
D7 pin - Digital i/o pin
D8 pin - Digital i/o pin
D9 pin - Digital i/o pin, PWM pin
D10 pin - Digital i/o pin, PWM pin, SS pin
D11 pin - Digital i/o pin, PWM pin, MOSI pin
D12 pin - Digital i/o pin, MISO pin
D13 pin - Digital i/o pin, SCK pin
Pin 10, 11, 12, 13 is known as SPI pins.These are high speed serial data transmitter/receiver pins
A0 - Analog i/o pin
A1 - Analog i/o pin
A2 - Analog i/o pin
A3 - Analog i/o pin
A4 - Analog i/o pin, SDA pin
A5 - Analog i/o pin, SCL pin
Pin A4, A5 are I2C pins of arduino uno
Labels on arduino uno and function
Reset - Used for reseting arduino
3.3 V - Regulated 3.3 Volt DC supply for specefic applications and modules
5 V - 5V DC supply for external module interfacing
Gnd - Ground pin of arduino
Aref - Analog reference which is a high precision analog data signal input which can be given to arduino.
