AIM: To interface a digital input (push button) and blink and LED upon activation. COMPONENTS REQUIRED:

1. 1 KΩ Resistor
2. Arduino Uno
3. Bread board
4. USB Interfacing cable
5. Jumper wires
6. LED of choice THEORY : Arduino UNO The Uno is a microcontroller board based on the ATmega328P. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. Technical specifications of Arduino UNO : Microcontroller ATmega168/328 Microcontroller ATmega168/328 Operating Voltage 5V Input Voltage (recommended) 7-12V Input Voltage (limits) 6-20V Digital I/O Pins 14 (of which 6 provide PWM output) Analog Input Pins 6 DC Current per I/O Pin 40 mA DC Current for 3.3V Pin 50 mA Flash Memory 16 KB (ATmega168) or 32 KB (ATmega328) of which 2 KB used by boot loader SRAM 1 KB (ATmega168) or 2 KB (ATmega328) EEPROM 512 bytes (ATmega168) or 1 KB (ATmega328) Clock Speed 16 MHz PIN DIAGRAM FOR ATMEGA 328

FIGURE-01

FIGURE-02 PROCEDURE Open tinker cad account

1. Select Arduino uno , bread board , digital input and digital output
2. Connect the circuit as given in the figure
3. Develop the program and compile it for any errors
4. .Execute the program
5. Check the simulation

CIRCUIT DIAGRAM

FIGURE -03

PROGRAM

// C++ code
int ledpin=4;
int pushbtn=2;
int val=0;
void setup()
{
 pinMode(ledpin, OUTPUT);
 pinMode(pushbtn,INPUT);
}

void loop()
{
 val=digitalRead(pushbtn);
 if(val==0)
 {
   digitalWrite(ledpin,HIGH);
 }
 else
 {
   digitalWrite(ledpin,LOW);
 }
}

BEFORE RUNNING THE SIMULATION:

Thus, we have interfaced a digital input (push button) and blink of LED upon activation.