Published August 26, 2020 © GPL3+

Smart Solar Public Hand wash/sanitizer machine(Arduino Nano)

As a digital company, our product is : Smart solar public hand sanitizer/wash that is controlled by a sensor Hereby reduce spread of virus.

IntermediateFull instructions providedOver 2 days2,936

Judges Choice - US Based Project

2020 China-US Young Maker Competition

Smart Solar Public Hand wash/sanitizer machine(Arduino Nano)

Things used in this project

Hardware components

Metal Enclosure, Electrical / Industrial

Seeed Studio Grove - PIR Motion Sensor

100 watts, 12 volts Solar panel

12 volts, Deep cycle rechargable battery (any design will do)

500 watt inverter

12v water DC pump (3 pcs)

5v relay module (4 pcs)

mini hair dryer ( used as hand dryer)

Kitchen sink

Hose pipe for water pump

Jumper wires (generic)

Tap head ( normal water tap head)

3 Plastic containers( for liquid storage)

Arduino Nano board

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)

Solder Wire, Lead Free

Arduino nano board

Story

This project is an automatic hand washing, drying & sanitizingmachine powered by solar technology, it uses motion detector to work automatedly and has a drier attached to it. Integration of solar panel is to enable people in developing countries to be able to use this design.

This project cost about $180 to make.

Materials:

12v Water DC Pump (3 Pcs)

Arduino Nano

PIR sensor

Kitchen Sink

Hose Pipe for water pump

Jumper wires

4 X 1 Channel Relay Module

100 watt 12v solar panel

Tap head ( normal water tap head)

12v rechargable battery

500 watt Inverter

Mini hair dryer( used as hand dryer)

3 plastic containers (for water, liquid soap & sanitizer)

Wooden frame, metal frame & nails.

Jumper wires

3 X 12v dc water pump ( Pump1, Pump2, pump3)

Hose pipe

1 / 2 • PIR sensor

Arduino Nano board

Design & Connection

Pin 8 from the Arduino board goes to PIR sensor Output pin, Pin 9(Arduino) goes to First relay module, Pin 5( Arduino) goes to Second relay module, Pin 6(Arduino) goes to Third relay module, Pin 7(Arduino) goes to Fourth relay module. Connect GND to GND of Arduino & PIR VCC pin to Arduino 5v pin. If you don't have a relay module you can use 2N2222 transistor with a 5v relay.

The 12v DC Pump has two holes, an output (discharging) and an Input( sucking in) hole. Connect the Hose pipe to Tap head and to output of Pump 1 (Soap discharging pump) then connect Pump1 input hole to liquid soap plastic container.

Connect another hose pipe to Tap head and to output of Pump2(water dispensing pump) then connect it input hole to water tank/container.

Connect another hose pipe to the tap head and to the output of Pump3 (sanitizer dispensing pump) then connect it input hole to the sanitizer container.

Finally mount the hand dryer at the edge of the machine.

Electrical connections

Connect Pump1 VCC to First relay Normal open pin, Pump2 VCC to Second relay Normal open pin, Pump3 to Third relay Normal open pin and their negative to 12v battery negative. Then connect Battery positive to the Relays module Common pins. Connect Fourth relay Normal open pin to inverter 220v positive & it Common pin to positive of hand dryer and hand dryer negative direct to inverter 220v negative.

Connect the solar panel positive to the positive of the 12v battery and to positive of inverter and negative of the solar battery to battery negative and inverter negative.

The Arduino board can be powered by 5v adapter connected to the inverter or using 7805 IC to connect it to the 12v battery.

Schematics

Code

Arduino code

int pump1 = 9; // PUMP1
int pump2 = 5; // PUMP2
int pump3 = 6; // PUMP3
int dryer = 7; // Hand dryer
int inputPin = 8; // choose the input pin (for PIR sensor)

int val = 0; // variable for reading the pin status

void setup() {

pinMode(pump1, OUTPUT); // declare pump as output
pinMode(pump2, OUTPUT); // declare pump as output
pinMode(pump3, OUTPUT); // declare pump as output   
pinMode(dryer, OUTPUT); // declare dryer as output 

pinMode(inputPin, INPUT); // declare sensor as input

Serial.begin(9600);

}

void loop(){

val = digitalRead(inputPin); // read input value

Serial.println(val);

if( val == HIGH) {

digitalWrite(pump1,HIGH); // turn ON the soap pump
delay(5000);    
digitalWrite(pump1,LOW); // turn OFF the pump       
digitalWrite(pump2,HIGH); // turn ON the water pump
delay(20000);   //for 20 seconds 
digitalWrite(pump2,LOW); // turn OFF the pump          
digitalWrite(dryer,HIGH); // turn ON the hand dryer  
delay(10000);   
digitalWrite(dryer,LOW); // turn OFF the dryer     
digitalWrite(pump3,HIGH); // turn ON the sanitizer pump
delay(5000);    
digitalWrite(pump3,LOW); // turn OFF the pump                 
} else {

digitalWrite(pump1,LOW); // turn OFF the pump
digitalWrite(pump2,LOW); // turn OFF the pump
digitalWrite(pump3,LOW); // turn OFF the pump
 digitalWrite(dryer,LOW); // turn OFF the dryer
 

}

}

Credits

Onwusoro Ifeanyi Emmanuel

1 project • 5 followers

A graduate of Mechanical Engineering, I have been developing for 7 years plus, I love solving real life problems with innovative technology.

Comments

Awards

Judges Choice - US Based Project

2020 China-US Young Maker Competition

Smart Solar Public Hand wash/sanitizer machine(Arduino Nano)