MULTIPLE USERS AUTOMATIC HAND SANITIZING MACHINE

INTRODUCTION

Due to the increase of COVID 19 virus in the world, it is necessary for us to ensure the safety of lives and properties of our people within our jurisdiction by stopping the spread of the deadly coronavirus. One of the critical measures provided by the World Health Organization (WHO) is constant washing of hands with liquid soap /alcohol-based hand sanitizer under running water. In order to carry out this above-stated operation, we need to develop a system that can be operated without the use of human hands.

The currently available system is purely mechanical and can only serve one person at a time. I look inward and we came up with a seasonal solution that can serve four users at a time and can be operated manually(mechanically) or electrically. The system is suitable for highly populated areas and can be backed up using solar energy.

FEATURES OF THE SYSTEM

• 2500 liters of water storage tank

• 500 liters soap/ alcohol-based solution tank

• Ergonomic free

• Durability

• Multiple users at a time minimum of four people at a time

• Programmable time for washing and rinsing of hand

• It is modular

• Easy to use

• Solar backed up in case of a power outage

  MANUALLY / MECHANICAL OPERATED SYSTEM

This system utilizes a complete mechanical linkages arrangement in form of wire, ropes, and a pedal system to operate a mechanical valve responsible for opening and closing water and liquid soap. The user utilizes his/her hindlimb(foot) to press the pedal which thereby opens the needed valve. Each used have its own individual pedal and as long as the pedal is pressed the required fluid keeps rushing down under gravity.

MATERIAL

1. Stainless steel kitchen sink

2. Plastic water storage tank

3. Plastic liquid soap tank

4. Lift the water control valve

5. 2mm thick angle iron

6. Mechanical rope system

7. PVC pipe

8. Pipe fitting

9. Plastic waste water storage tank

   SERVICE OPERATION

10. WELDING

11. PLUMBING

12. DESIGN AND FITTING

    SOLAR BACKUP ELECTRICAL SYSTEM

This system utilizes an infrared sensor in detecting the presence of the user's hand close to the washing basin. This resulting signal is then used in triggering the flow of the required fluid. At the start the liquid soap/alcohol base hand sanitizer flows for forty-five (45) seconds, thereafter the water begins to rush after 30sec of stoppage for the liquid soap / alcohol-based hand sanitizer. The water rushes for 120 seconds and stops automatically. If the hand of the user is still present the system cycles the process again. Peradventure the user removes their hand the system automatically senses this and stops any ongoing process and shut off the valves until the presence of the hand is detected again.
Due to inconsistent power supply, we decide to power this system using abundant solar energy and a backed-up battery in case of solar power outage though this system is expected to work during the active solar hours of the day. All the specification as regards the mechanical system holds for this system also.

SERVICE OPERATION

1. WELDING
2. PLUMBING
3. DESIGN AND FITTING
4. Electrical fixing

MATERIAL 

1. Stainless steel kitchen sink
2. Plastic water storage tank
3. Plastic liquid soap tank
4. 2mm thick angle iron
5. PVC pipe
6. Pipe fitting
7. Plastic waste water storage tank
8. Liquid pump
9. Infrared sensor
10. Arduino Uno
11. Relays and circuitry components
12. Power supply for Arduino
13. 100W solar panel
14. 32AH Lead Acid battery
15. Wires and circuit breaker
16. Solar charge controller

DEVELOPMENT STAGES

1. MACHINE DESIGN ON SOLIDWORKS
   SOLIDWORKS is a world leader in 3D solutions that help millions of engineers and designers succeed through innovation. SOLIDWORKS, a solid modeling computer-aided design, and computer-aided engineering program is one of the most popular software options for mechatronics engineers.

2 MATERIAL PROCUREMENT AND FRAME WELDING
All the necessary materials were procured from a quality shop and welding of the angle profile steel was done by me.

3 ASSEMBLY OF ACCESSORIES
Kitchen sink, Tap , water tank and all other needed equipment was assembled

4 PEDAL SYSTEM CONSTRUCTION AND TESTING

5 PAINTING
All the assembled accessories was removed and I hired the service of a professional painter

6 PLUMBING INSTALLATION AND FINAL COUPLING (MECHANICAL)

7. ELECTRICAL CONNECTION AND CODING

The infrared sensor was used to detect the presence of the user and 12Vdc motor is used to manually open that tap.Arduino was used to control this whole system , here is the Arduino code for the machine

int HBRIDGE=3;
int MOTOR1=4; // SOAP MOTOR
int MOTOR2=5; // WATER MOTOR

void setup() {
// LOW OF HBRIDGE SMOTOR IS CLOSING THE VALVE WHILE HIGH IS DOING CONTRARY

Serial.begin(9600);
pinMode(HBRIDGE,OUTPUT);
pinMode(MOTOR1,OUTPUT);
pinMode(MOTOR2,OUTPUT);

}

void loop() {
// put your main code here, to run repeatedly:
// SOAP RUNNING OPERATION
int state= digitalRead(2);
while ( state==HIGH){
digitalWrite(MOTOR1,HIGH);
digitalWrite(MOTOR2,LOW);
digitalWrite(HBRIDGE,HIGH);
Serial.print("clockwise");
delay(400); // the time taken for the screw thread to max position
digitalWrite(HBRIDGE,LOW);
Serial.print("Anticlockwise");
digitalWrite(MOTOR1,LOW);
delay(2000); // the time taken for the soap to keep position

digitalWrite(MOTOR1,HIGH);

digitalWrite(HBRIDGE,LOW);
delay(400); // the time taken for the screw thread to RETURN position
digitalWrite(HBRIDGE,LOW);
digitalWrite(MOTOR1,LOW);
delay(2000); // the time taken for the user to wash his(her) hand

// WATER RUNNING OPERATION

digitalWrite(MOTOR2,HIGH);
digitalWrite(MOTOR1,LOW);
digitalWrite(HBRIDGE,HIGH);
Serial.print("clockwise");
delay(500); // the time taken for the screw thread to max position
digitalWrite(HBRIDGE,LOW);
digitalWrite(MOTOR2,LOW);
delay(2000); // the time taken for the soap to keep position

digitalWrite(MOTOR2,HIGH);

digitalWrite(HBRIDGE,LOW);
Serial.print("Anticlockwise");
delay(500); // the time taken for the screw thread to RETURN position
digitalWrite(HBRIDGE,LOW);
digitalWrite(MOTOR2,LOW);
delay(2000); // the time taken for the user to wash his(her) hand
return;
}

//digitalWrite(HBRIDGE,LOW);
//digitalWrite(MOTOR1,HIGH);
//digitalWrite(MOTOR2,HIGH);
//delay(1000); // the time taken for the screw thread to RETURN position
digitalWrite(MOTOR1,LOW);
digitalWrite(MOTOR2,LOW);

}

Here is the complete project