Mr. Screw Driver Blog

How To Make Arduino Countdown Timer with LCD || MSD

September 24, 2020 21 Comments

Circuit --

Circuit

Code ---

#include <LiquidCrystal.h>
#include<EEPROM.h>
const int rs = 7, en = 6, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
const int stsp = A0;
const int inc = A1;
const int dec = A2;
const int set = A3;
const int buzz = 9;
const int relay = 8;
int hrs = 0;
int Min = 0;
int sec = 0;
unsigned int check_val = 50;
int add_chk = 0;
int add_hrs = 1;
int add_min = 2;
bool RUN = true;
bool min_flag = true;
bool hrs_flag = true;
void setup()
{
  lcd.begin(16, 2);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Mr. Screw Driver");
  lcd.setCursor(0, 1);
  lcd.print("COUNTDOWN TIMER");
  pinMode(stsp, INPUT_PULLUP);
  pinMode(inc, INPUT_PULLUP);
  pinMode(dec, INPUT_PULLUP);
  pinMode(set, INPUT_PULLUP);
  pinMode(buzz, OUTPUT);
  pinMode(relay, OUTPUT);
  digitalWrite(relay, LOW); 
  digitalWrite(buzz, LOW);
  if (EEPROM.read(add_chk) != check_val)
  {
    EEPROM.write(add_chk, check_val);
    EEPROM.write(add_hrs, 0);
    EEPROM.write(add_min, 1);
  }
  else
  {
    hrs = EEPROM.read(add_hrs);
    Min = EEPROM.read(add_min);
  }
  delay(1500);
  INIT();
}

void loop()
{
  if (digitalRead(stsp) == LOW)
  {
    lcd.clear();
    delay(250);
    RUN = true;
    while (RUN)
    {
      if (digitalRead(stsp) == LOW)
      {
        delay(1000);
        if (digitalRead(stsp) == LOW)
        {
          digitalWrite(relay, LOW); 
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("  TIMER STOPPED");
          lcd.setCursor(0, 1);
          lcd.print("----------------");
          delay(2000);
          RUN = false;
          INIT();
          break;
        }
      }
      digitalWrite(relay, HIGH); 
      sec = sec - 1;
      delay(1000);
      if (sec == -1)
      {
        sec = 59;
        Min = Min - 1;
      }
      if (Min == -1)
      {
        Min = 59;
        hrs = hrs - 1;
      }
      if (hrs == -1) hrs = 0;
      lcd.setCursor(0, 1);
      lcd.print("****************");
      lcd.setCursor(4, 0);
      if (hrs <= 9)
      {
        lcd.print('0');
      }
      lcd.print(hrs);
      lcd.print(':');
      if (Min <= 9)
      {
        lcd.print('0');
      }
      lcd.print(Min);
      lcd.print(':');
      if (sec <= 9)
      {
        lcd.print('0');
      }
      lcd.print(sec);
      if (hrs == 0 && Min == 0 && sec == 0)
      {
        digitalWrite(relay, LOW); 
        lcd.setCursor(4, 0);
        RUN = false;
        for (int i = 0; i < 20; i++)
        {
          digitalWrite(buzz, HIGH);
          delay(100);
          digitalWrite(buzz, LOW);
          delay(100);
        }
        INIT();
      }
    }
  }
  if (digitalRead(set) == LOW)
  {
    delay(500);
    while (min_flag)
    {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("SET MINUTE: ");
      lcd.print(Min);
      delay(100);
      if (digitalRead(inc) == LOW)
      {
        Min = Min + 1;
        if (Min >= 60) Min = 0;
        delay(100);
      }
      if (digitalRead(dec) == LOW)
      {
        Min = Min - 1;
        if (Min <= -1) Min = 0;
        delay(100);
      }
      if (digitalRead(set) == LOW)
      {
        min_flag = false;
        delay(250);
      }
    }
    while (hrs_flag)
    {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("SET HOUR: ");
      lcd.print(hrs);
      delay(100);
      if (digitalRead(inc) == LOW)
      {
        hrs = hrs + 1;
        if (hrs > 23) hrs = 0;
        delay(100);
      }
      if (digitalRead(dec) == LOW)
      {
        hrs = hrs - 1;
        if (hrs <= -1) hrs = 0;
        delay(100);
      }
      if (digitalRead(set) == LOW)
      {
        hrs_flag = false;
        delay(250);
      }
    }
    if (hrs == 0 && Min == 0)
    {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("  INVAID TIME");
      delay(2000);
    }
    else
    {
      EEPROM.write(add_hrs, hrs);
      EEPROM.write(add_min, Min);
    }
    INIT();
  }
}

void INIT()
{
  hrs = EEPROM.read(add_hrs);
  Min = EEPROM.read(add_min);
  sec = 0;
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Start / Set Time");
  lcd.setCursor(4, 1);
  if (hrs <= 9)
  {
    lcd.print('0');
  }
  lcd.print(hrs);
  lcd.print(':');
  if (Min <= 9)
  {
    lcd.print('0');
  }
  lcd.print(Min);
  lcd.print(':');
  if (sec <= 9)
  {
    lcd.print('0');
  }
  lcd.print(sec);
  min_flag = true;
  hrs_flag = true;
  delay(500);
}

How To Make A Voltmeter Using Arduino || 0v - 30v ||

How To Make A Voltmeter Using Arduino

In order to measure voltages greater than the 5 V reference voltage, you need to divide the input voltage so that the voltage actually input to the Arduino is 5 V or less. in this experiment, we will use a 90.9 kohm resistor and a 10 kohm resistor to create a 10:1 divider. This will allow us to measure voltages up to 50 V.

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Hardware Required

1x Arduino UNO

1x 90.9 kohm resistor

1x 10 kohm resistor

1x LCD (Liquid Crystal Display)

1x 5k potentiometer

1x breadboard

female connector

jumper wires

Wiring Diagram

Code

#include <LiquidCrystal.h>

LiquidCrystal lcd(7, 8, 9, 10, 11, 12);

float input_voltage = 0.0;
float temp=0.0;
float r1=90900.0;
float r2=10000.0;


void setup()
{
   Serial.begin(9600);     //  opens serial port, sets data rate to 9600 bps
   lcd.begin(16, 2);       // set up the LCD's number of columns and rows: 
   lcd.print("DIGITAL V METER");
}
void loop()
{
   
//Conversion formula

   int analog_value = analogRead(A0);
    temp = (analog_value * 5.0) / 1024.0; 
   input_voltage = temp / (r2/(r1+r2));
   
   if (input_voltage < 0.1) 
   {
     input_voltage=0.0;
   } 
    Serial.print("v= ");
    Serial.println(input_voltage);
    lcd.setCursor(0, 1);
    lcd.print("Voltage= ");
    lcd.print(input_voltage);
    delay(300);
}

How To Make Multifunction LED Chaser With Arduino ||5 in 1||

December 13, 2019 0 Comment Arduino Arduino Based DIY Hack How To Projects Tutorials

LED Chaser With Arduino

Hello friends. What's up? Hope doing well. Today we are going to make a simple but very interesting LED Chaser with Arduino.

So let's started............

Required Components:

1. Arduino

2. LED * 4 Pcs { you can take more }

3. Push Button

4. 100 ohm Resistor [ 1/4 watt ] * 4 Pcs

5. Breadboard

6. Some jumper wires.

7. 10k ohm Resistor

Circuit Diagram:

Here is the circuit diagram.......

Code:

int buttonstate = 0;
int led1 = 3;
int led2 = 5;
int led3 = 6;
int led4 = 9;
int button = 8;
int brightness = 0;

void setup()
{
  pinMode(button, INPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  
  Serial.begin(9600); 
  
}

void mode1(){
  digitalWrite(led1,HIGH);
  digitalWrite(led2,HIGH);
  digitalWrite(led3,HIGH);
  digitalWrite(led4,HIGH);
  delay(100);
  digitalWrite(led1,LOW);
  digitalWrite(led2,LOW);
  digitalWrite(led3,LOW);
  digitalWrite(led4,LOW);
  delay(100);
  }
  
void mode2(){
  digitalWrite(led1,HIGH);
  delay(100);
  digitalWrite(led2,HIGH);
  delay(100);
  digitalWrite(led3,HIGH);
  delay(100);
  digitalWrite(led4,HIGH);
  delay(100);
  digitalWrite(led1,LOW);
  delay(100);
  digitalWrite(led2,LOW);
  delay(100);
  digitalWrite(led3,LOW);
  delay(100);
  digitalWrite(led4,LOW);
  delay(100);
  }

void mode3(){
  digitalWrite(led4,HIGH);
  delay(100);
  digitalWrite(led3,HIGH);
  delay(100);
  digitalWrite(led2,HIGH);
  delay(100);
  digitalWrite(led1,HIGH);
  delay(100);
  digitalWrite(led4,LOW);
  delay(100);
  digitalWrite(led3,LOW);
  delay(100);
  digitalWrite(led2,LOW);
  delay(100);
  digitalWrite(led1,LOW);
  delay(100);
  }

void mode4(){
 
  for (brightness = 0; brightness <= 255; brightness += 5) {
    analogWrite(led1, brightness);
    analogWrite(led2, brightness);
    analogWrite(led3, brightness);
    analogWrite(led4, brightness);
    delay(30); // Wait for 30 millisecond(s)
  }
  for (brightness = 255; brightness >= 0; brightness -= 5) {
    analogWrite(led1, brightness);
    analogWrite(led2, brightness);
    analogWrite(led3, brightness);
    analogWrite(led4, brightness);
    delay(30); // Wait for 30 millisecond(s)
  }

  digitalWrite(led4,HIGH);
  delay(100);
  digitalWrite(led3,HIGH);
  delay(100);
  digitalWrite(led2,HIGH);
  delay(100);
  digitalWrite(led1,HIGH);
  delay(100);
  digitalWrite(led4,LOW);
  delay(100);
  digitalWrite(led3,LOW);
  delay(100);
  digitalWrite(led2,LOW);
  delay(100);
  digitalWrite(led1,LOW);
  delay(100);
  }

 void mode5(){
  mode1();
  mode2();
  mode3();
  mode4();
  }  

void loop()
{
  int value = digitalRead(button);
 
  if(value == 1){
    delay(1000);
  buttonstate = buttonstate + 1 ;
  }
  Serial.println(buttonstate);
  if(buttonstate > 5){
     buttonstate = 0;
  }
  
  if(buttonstate == 1){
     mode1();
  }

  if(buttonstate == 2){
     mode2();
  }

  if(buttonstate == 3){
     mode3();
  }
  if(buttonstate == 4){
     mode4();
  }
  if(buttonstate == 5){
  
  mode5();
  }  


}

Hurray...Our chaser is ready.

This has 5 different function. Pressing the button you can change the chasing style.

Enjoy : )