Arduino Uno R3 Technical Datasheet

Board Specifications

Microcontroller	ATmega328P
Operating Voltage	5V
Input Voltage	7-12V (recommended)
Digital I/O Pins	14 (6 provide PWM output)
Analog Input Pins	6
Flash Memory	32 KB (0.5 KB used by bootloader)
SRAM	2 KB
EEPROM	1 KB
Clock Speed	16 MHz
Dimensions	68.6mm × 53.4mm

Communication Interfaces

Interface	Pins	Protocol
Serial	0 (RX), 1 (TX)	UART
I2C	A4 (SDA), A5 (SCL)	TWI
SPI	10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK)	Serial Peripheral Interface

Power Specifications

Power Sources

• USB connection (5V)
• DC power jack (7-12V)
• Vin pin (7-12V)

Current Ratings

• 5V pin: 500mA max
• 3.3V pin: 50mA max
• I/O pins: 20mA per pin (40mA max total)

Additional Resources

• Schematic Diagram (PDF)
• Arduino IDE Download
• Official Product Page

Arduino LCD 16x2 Display Guide

This guide explains how to display "Welcome to Fab Academy" on a 16x2 LCD using an Arduino and the Adafruit_LiquidCrystal library.

1. Required Components

• Arduino Board (Uno, Mega, etc.)
• 16x2 LCD Display
• I2C Module (PCF8574T)
• Connecting Wires
• External Power Source (if needed)

2. Wiring Instructions

LCD Pin	Arduino Pin
VCC	5V
GND	GND
SDA	A4 (Uno) / 20 (Mega)
SCL	A5 (Uno) / 21 (Mega)

3. Arduino Code

            #include <Adafruit_LiquidCrystal.h>
            int seconds = 0; 
        Adafruit_LiquidCrystal lcd_1(0);
    
        void setup() {
            lcd_1.begin(16, 2);
            lcd_1.print("Welcome to Fab");
            lcd_1.setCursor(0, 1);
            lcd_1.print("Academy");
            delay(2000);
            lcd_1.clear();
            }
    
        void loop() {
            lcd_1.setCursor(0, 0);
            lcd_1.print("Time (sec): ");
            lcd_1.setCursor(11, 0);
            lcd_1.print(seconds);
        
            lcd_1.setBacklight(1);
            delay(500);
            lcd_1.setBacklight(0);
            delay(500);
        
            seconds++;
        }
        

4. Explanation

• lcd_1.begin(16,2); – Initializes the LCD with 16 columns & 2 rows.
• lcd_1.print("Welcome to Fab"); – Displays text on the first row.
• lcd_1.setCursor(0, 1); lcd_1.print("Academy"); – Moves to the second row and prints "Academy".
• delay(2000); lcd_1.clear(); – Keeps the message for 2 seconds and then clears the screen.
• lcd_1.setBacklight(1); – Turns ON the backlight.
• lcd_1.setBacklight(0); – Turns OFF the backlight (blinking effect).
• seconds++; – Increments the time counter.