មេរៀនទី១៣៖ Digital Read (INPUT_PULLUP)

INPUT_PULLUP

 

1. Objective

The objective is talk about, how to use digital read by using INPUT_PULLUP method in arduino to blink LED.

2. Requirement

• Arduino Uno x1
• USB Cable x1 (No need in simulation)
• Breadboard x1 (No need in simulation)
• LED x2
  
• Resistor (220Ohm or 330Ohm) x2
  
• Electronic Wire (No need in simulation) 
• Button x1
  

 

3. Build Circuit

Build circuit like Figure 1.

Figure 1: Arduino Connection

 

4. Coding

// Coding by Tann Thona (22/09/2019)

void setup() {
  // put your setup code here, to run once:
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);
  pinMode(2, INPUT_PULLUP);

}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(2) == 0)
  {
    for(int i = 0; i<20; i++)
    {
      digitalWrite(12, 1);
      digitalWrite(13, 0);
      delay(30); 
      digitalWrite(12, 0);
      digitalWrite(13, 1);
      delay(30);
    }
  }
  else if (digitalRead(2) == 1)
  {
    digitalWrite(12, 1);
    digitalWrite(13, 1);
  }
}
 

Click Here to Download Code and Proteus Simulation File 

 

4. Result

According to code above, if we press button switching blink 20 times and unpressed LEDs is bright .

Watch Video Explain in Khmer

YouTube: ICT4D-KH

Copyright By Tann Thona