Yeshvanth M
Published

UV-C Based Germs Disinfecting Machine

A touch-free germs disinfecting device that can disinfect anything from masks, wallets to mobile phones, killing maximum germs using UV-C.

IntermediateFull instructions provided20 hours1,851

Things used in this project

Hardware components

Arduino MKR WiFi 1010
Arduino MKR WiFi 1010
×1
Arduino UNO & Genuino UNO
Arduino UNO & Genuino UNO
×1
MG90S Micro Servo
×1
PHPoC Bread Board
PHPoC Bread Board
×1
Jumper wires (generic)
Jumper wires (generic)
×1
UVC Lamp
×1
RGB Backlight LCD - 16x2
Adafruit RGB Backlight LCD - 16x2
×1
IR Proximity Sensor
Digilent IR Proximity Sensor
×2
Ultrasonic Sensor - HC-SR04 (Generic)
Ultrasonic Sensor - HC-SR04 (Generic)
×1
Stepper motor driver board A4988
SparkFun Stepper motor driver board A4988
×1
1-Channel Signal Relay 1A SPDT I²C Mini Module
ControlEverything.com 1-Channel Signal Relay 1A SPDT I²C Mini Module
×1

Software apps and online services

Arduino IDE
Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)
Solder Wire, Lead Free
Solder Wire, Lead Free
Solder Flux, Soldering
Solder Flux, Soldering
Drill / Driver, Cordless
Drill / Driver, Cordless
Multitool, Screwdriver
Multitool, Screwdriver
Hammer
Poker
Hacksaw with Blade

Story

Read more

Schematics

The complete schematic for the disinfecting machine.

The Fritzing File

The photo of the complete circuitry

Connect the UV-C Lamp to the main supply and the relay such that it's powered by the external source and turned ON by the relay.

Code

Arduino MKR WiFi 1010 - YM Labs Germs Disinfecting Machine.ino

C/C++
It's used to control the whole set up. To program the Arduino MKR WiFI 1010
//  _    _         _               ___     ___ 
//  \\  //         ||       /\    ||  \\  //  \\
//   \\//    __    ||      /__\   ||__//  \\__  
//    //\\  //\\   ||     //  \\  ||  \\  _   \\
//   //  \\//  \\  ||||| //    \\ ||__//  \\__// 

// A YM Labs Production

//////////////////////////////////////////////
// For Stepper Motor -  Pins                //
   const int stepPin = 3;                   //
   const int dirPin = 4;                    //      
////////////////////////////////////////////// 
// For LCD                                  //
//  Libraries                               //  
    #include <Wire.h>                       //
    #include <LCD.h>                        //
    #include <LiquidCrystal_I2C.h>          //
//  I2C Object,                             //
LiquidCrystal_I2C  lcd(0x3F,2,1,0,4,5,6,7); //
//////////////////////////////////////////////
//  For Ultrasonic Sensor                   //
// Trigger pin and echo pin                 //
    const int pingPin = 7;                  //
    const int echoPin = 6;                  //
// Distance                                 //
    long duration, cm;                      //
//////////////////////////////////////////////
// For Limit switch                         //
// Setting pin and value                    //        
    const int b_ls = A3;                    //
    int bls_val = LOW;                      //   
//////////////////////////////////////////////
//  For IR Sensors                          //
//  Setting the pins and values             //
    const int ir1 = A4;                     //
    const int ir2 = A5;                     //
    int val1 = 0;                           //
    int val2 = 0;                           //
//////////////////////////////////////////////
//  For timers                              // 
    long int time1, time2;                  //
    int timer = 1000;                       //
    long int dis_time = 12500*60;           //
//////////////////////////////////////////////
//  For UV light                            //
    const int uv_pin = 1;                   //
//////////////////////////////////////////////
// For Servo                                //
   const int servopin = 9;                  //
//////////////////////////////////////////////

void setup() 
{

//////////////////////////////////////////////
//Setting up the Traverser                  //
//Setting Stepper Motor pins                //
  pinMode (stepPin,OUTPUT);                 //
  pinMode (dirPin,OUTPUT);                  //    
                                            //
//Enabling pulldown for Limit Switch        //
  pinMode (b_ls, INPUT_PULLDOWN);           //
                                            //
//Set direction to backward                 //
  digitalWrite (dirPin,LOW);                //
//------------------------------------------//
//Bring the traverser to the position       //
  while (bls_val == LOW)                    //
  {                                         //
    digitalWrite (stepPin,HIGH);            //
    delay (1);                              //
    digitalWrite (stepPin,LOW);             //
    delay (1);                              //
    //Continuously read switch value        //
    bls_val = digitalRead (b_ls);           //
  }                                         //
//////////////////////////////////////////////
// Set up the LCD                           //
  lcd.begin (16,2); // For 16*2 LCD         //
  lcd.clear ();                             //
  lcd.home ();                              //
  lcd.print ("UVC Based");                  //
  lcd.setCursor (0,1);                      //
  lcd.print ("Disinfector");                //
  delay(4000);                              //
//////////////////////////////////////////////
// Set up the Ultrasonic Sensor             //
  pinMode (pingPin, OUTPUT);                //
  pinMode (echoPin, INPUT);                 //    
//////////////////////////////////////////////
// Set up the IR sensors                    //
  pinMode (ir1, INPUT);                     //
  pinMode (ir2, INPUT);                     //
//////////////////////////////////////////////
// Set up UV light enable pin               //
  pinMode (uv_pin, OUTPUT);                 //
//////////////////////////////////////////////    
// Disable flip                             //
  pinMode( servopin, OUTPUT);               //
  digitalWrite(servopin, LOW);              //
//////////////////////////////////////////////
} 

void loop() 
{
  execute();
}



void execute()
{ 
  DisplayControl (1);      //Display open tray option
  delay(1000);
  sense_1();               //To sense sensor 1
    DisplayControl (2);    //Display status message
    TraverserControl (1);  //Open the tray
    DisplayControl (3);    //Display Close tray option
  sense_2();               //To sense sensor 2
    DisplayControl (9);    //Display status message
    TraverserControl (0);  //To close the tray
    DisplayControl (4);    //To display default time
    int val = sense_1_2_();//To sense both sensors for input
    if (val == 0)          //If user selects to 
    {  
      DisplayControl (5);  //Display disinfecting message
      disinfect();         //Start disinfection
    }
    else
    {
       changeTime();       //To change default timing
       DisplayControl (5); //Display disinfecting message 
       disinfect();        //Start disinfection
    }
  sense_1();
    DisplayControl (6);    //Display status message
    TraverserControl (1);  //To open the tray
  sense_1();
    DisplayControl (9);    //Display status message
    TraverserControl (0);  //To close the tray
    DisplayControl (7);    //Display thank you message
}

//To control the display
void DisplayControl(int a)
{
  lcd.clear ();
  lcd.home ();
  switch (a)
  {
    case 1:                              
      lcd.print ("Do not touch :)");                  
      lcd.setCursor (0,1);                      
      lcd.print ("1 to Open tray");
      break;
    case 2:
      lcd.print ("Opening tray");
      lcd.setCursor (0,1);                      
      lcd.print ("Please wait...");
      break;
    case 3:
      lcd.print ("Place the items");
      lcd.setCursor (0,1);
      lcd.print ("2 to close tray");
      break;
    case 4:
      lcd.print ("Default time:");
      lcd.setCursor (0,1);
      lcd.print ("12.5 Minutes");
      delay (4000);
      lcd.clear ();
      lcd.home();
      lcd.print ("1 to continue");
      lcd.setCursor (0,1);                      
      lcd.print ("2 to change time");
      break;
    case 5:
      lcd.print ("Disinfecting...");
      lcd.setCursor (0,1);                      
      lcd.print ("Emergency stop 1");
      break;
    case 6:
      lcd.print ("Opening tray...");
      lcd.setCursor (0,1);                      
      lcd.print ("1 to close tray");
      break;
    case 7:
      lcd.print ("Thank you for");
      lcd.setCursor (0,1);                      
      lcd.print ("using YM Labs DM");
      break; 
    case 8:
      lcd.print ("Invalid choice");
      lcd.setCursor (0,1);                      
      lcd.print ("Try again");
      break;  
    case 9:
      lcd.print ("Closing tray");
      lcd.setCursor (0,1);                      
      lcd.print ("Please wait...");
      break; 
      default:
      lcd.print ("Welcome to YM Labs!");       
  }
}


void disinfect()
{
  digitalWrite(uv_pin, HIGH);
  delay(dis_time/2);
  digitalWrite(servopin, HIGH);
  delay(1010);
  digitalWrite(servopin, LOW);
  delay(dis_time/2);
  digitalWrite(uv_pin, LOW);
}


// A simple recursive function to sense the right gesture of the hand on sensor 1
int sense_1()
{
  do 
  {
    val1 = digitalRead(ir1); 
  } while (val1 == 0);
    time1 = millis();
    while (val1 == 1) 
    {
      val1 = digitalRead(ir1);
      time2 = millis();
      if( (time2-time1) > timer) 
      { 
        return 0;
      }
    }
    sense_1();
}

// A simple recursive function to sense the right gesture of the hand on sensor 2
int sense_2()
{
  do 
  {
    val2 = digitalRead(ir2); 
  } while (val2 == 0);
    time1 = millis();
    while (val2 == 1) 
    {
      val2 = digitalRead(ir2);
      time2 = millis();
      if( (time2-time1) > timer) 
      { 
        return 0;
      }
    }
    sense_2();
}

// A simple recursive function to sense the right gesture of the hand on both sensors
int sense_1_2_()
{
  do
    {
      val1 = digitalRead(ir1); 
      val2 = digitalRead(ir2);
    } while (val1 == 0 && val2 == 0) ;
    if (val1 == 1 && val2 == 1)
    {
      DisplayControl (8);
      delay(2000);
      sense_1_2_();
    }
    time1 = millis();
    while (val1 == 1) 
    {
      val1 = digitalRead(ir1);
      time2 = millis();
      if( (time2-time1) > timer) 
      { 
        return 0;
      }
    }
    while (val2 == 1) 
    {
      val2 = digitalRead(ir2);
      time2 = millis();
      if ( (time2-time1) > timer) 
      {
        return 1;
      }
    }
    sense_1_2_();
}

// To control the stepper motor using the A4988 driver
void TraverserControl (int y)
{
  if (y == 0)
  {
    digitalWrite (dirPin, LOW);     // Set the directiom
    bls_val = digitalRead (b_ls);   // Read the limit switch
    while (bls_val == LOW)          // While traverser not at the end
    {
      digitalWrite (stepPin,HIGH); 
      delay (1); 
      digitalWrite (stepPin,LOW); 
      delay (1); 
      bls_val = digitalRead (b_ls); // Move the traverser and read the limit switch
    }
  }
  else
  {   
    digitalWrite (dirPin,HIGH);     // Set the directiom
    for (int x = 0; x < 6800; x++)  // Write the number of steps required to open the tray
    {
      digitalWrite (stepPin,HIGH); 
      delay (1); 
      digitalWrite (stepPin,LOW); 
      delay (1); 
    }
  }
}


//To change the time of disinfection
int changeTime()         
{
  while (val1 == 0) 
  {
    lcd.clear ();
    lcd.home ();
    lcd.print ("Timer: ");
    long dist = calcDistance();        // Calculate the distance 
// Set the timing in accordance with the distance between the hand and the sensor
    if (dist >= 1 && dist <= 5)        
    {
      lcd.print ("30 min.");
      dis_time = 1000*60*30;
    }
    else if (dist > 5 && dist <= 10)
    {
      lcd.print ("1 Hr.");
      dis_time = 1000*60*60;
    }
    else if (dist > 10 && dist <= 15)
    {
      lcd.print ("2 Hrs.");
      dis_time = 1000*60*60*2;
    }
    else if (dist > 15 && dist <= 20)
    {
      lcd.print ("4 Hrs.");
      dis_time = 1000*60*60*4;
    }
    else if (dist > 20 && dist <= 25)
    {
      lcd.print ("8 Hrs.");
      dis_time = 1000*60*60*8;
    }
    else if (dist > 25 && dist <= 30)
    {
      lcd.print ("12 Hrs.");
      dis_time = 1000*60*60*12;
    }
    else
    {
      lcd.print ("12.5 Min.");
      dis_time = 12500*60;
    }
    lcd.setCursor (0,1);                      
    lcd.print ("1 to set Timer"); 
    delay(500);
    val1 = digitalRead(ir1);
  }           // Repeat until the timer is set
  while (val1 == 1) 
  {
    lcd.clear ();
    lcd.home ();
    lcd.print("Timer Set");
    delay(2000);
    return 0;
  }
}

// To calculate the distance between the sensor and the hand
long calcDistance()       
{
  digitalWrite(pingPin, LOW);
  delayMicroseconds(2);
  digitalWrite(pingPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(pingPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  cm = microsecondsToCentimeters(duration);
  return cm;
}

// To convert the microseconds to distance in cm
long microsecondsToCentimeters(long microseconds) 
{
   return microseconds / 29 / 2; 
}

Arduino Uno- YM Labs Germs Disinfecting Machine.ino

C/C++
It controls the servo motors alone. Used to program the Arduino Uno
//  _    _         _               ___     ___ 
//  \\  //         ||       /\    ||  \\  //  \\
//   \\//    __    ||      /__\   ||__//  \\__  
//    //\\  //\\   ||     //  \\  ||  \\  _   \\
//   //  \\//  \\  ||||| //    \\ ||__//  \\__// 

// A YM Labs Production

//////////////////////////////////////////////
// For Servo Motor                          //  
//   Library                                //
     #include <Servo.h>                     //
//   Objects                                //
     Servo servo1;                          //
     Servo servo2;                          //      
//   Servo Positions                        //
     int pos1 = 0;                          //                   
     int pos2 = 0;                          //
//////////////////////////////////////////////
// For input from MKR WiFi 1010             //
     const int input = 12;                  // 
     int value = 0;                         //
//////////////////////////////////////////////
//  For timers                              // 
    long int time1, time2;                  //
    int timer = 1000;                       //
//////////////////////////////////////////////
void setup()
{
//////////////////////////////////////////////
// Setting up servo connection              //
   servo1.attach (3);                       //
   ServoControl (0);                        //
//////////////////////////////////////////////  
}


void loop()
{
  // Continuously check for input from arduino
  do 
  {
    value = digitalRead(input); 
  } while (value == 0);
  time1 = millis();
  while (value == 1) 
  {
    value = digitalRead(input);
    time2 = millis();
    if( (time2-time1) > timer) 
    { 
      flip();
      break;
    }
  }
}

// To flip the items
void flip()
{
  ServoControl(1);
  delay(1000);
  ServoControl(2);
  delay(1000);
}

// To make the servo to go from one angle to another
void ServoControl (int x)                   
{                                                                                      
  if (x == 1)                           
  { 
    pos2 = 166;                                       
    for (pos1 = 178; pos1 >= 30; pos1 -= 1)  
    {                                        
      servo1.write (pos1);
      servo2.write (pos2);                  
      delay (15);                            
    }    
    delay(250);
    for (pos1 = 30; pos1 <= 178; pos1 += 1)  
    {                                        
      servo1.write (pos1);      
      servo2.write (pos2);             
      delay (15);                           
    } 
    delay(250);
  }                                      
  else if (x == 2)                               
  {  
    servo2.attach(6);
    pos1 = 178;                                        
    for (pos2 = 166; pos2 >= 30; pos2 -= 1)
    {     
      servo2.write (pos2);
      servo1.write (pos1);
      delay (15);  
    }
    delay(250);                                      
    for(pos2 = 30; pos2 <= 166; pos2 += 1)   
    {                                        
      servo2.write (pos2); 
      servo1.write (pos1);                  
      delay (15);                            
    }    
    delay(250);    
    servo2.detach();                                
  }
  else
  {
    servo1.write (178);
    delay (1000);
    servo2.attach(6);
    servo2.write (166);
    delay (1000);
    servo2.detach();
  }
}

Credits

Yeshvanth M

Yeshvanth M

0 projects • 0 followers
10+ years of hands-on experience in Embedded Systems and IoT. I have done several projects using e-Waste, Good knowledge in MCU and Network.
Thanks to Yugandhi M, Muniraj V, and Mamtha Devi M.

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