1.Automatic water level controller

OBJECTIVE

To simulate a water level controller in Wokwi that automatically or manually controls the motor based on tank water levels, helping to save water and prevent overflow.

MODULES REQUIRED

Arduino uno
Ultrasonic sensor
Potentiometer
Push button
Resistor 1k
Led
Slide switch
DPDT Relay

SCHEMATIC DIAGRAM

SCHEMATIC CONNECTION

Connect potentiometer:

Connect the Gnd pin of the potentiometer to the RW pin on the Lcd.

Connect the Sig pin of the potentiometer to the V0 pin on the Lcd.

Connect the VCC pin of the potentiometer to the VDD pin on the Lcd .

Connect LCD :

Connect the Vs pin of the Lcd to the Gnd pin on the Arduino.

Connect the VDD pin of the Lcd to the 5V pin on the Arduino

Connect the RS pin of the Lcd to the D2 pin on the Arduino.

Connect the E pin of the Lcd to the D3 pin on the Arduino.

Connect the D4 pin of the Lcd to the D4 pin on the Arduino.

Connect the D5 pin of the Lcd to the D5 pin on the Arduino.

Connect the D6 pin of the Lcd to the D6 pin on the Arduino .

Connect the D7 pin of the Lcd to the D7 pin on the Arduino .

Connect the K pin of the Lcd to the GND pin on the Arduino .

Connect the A pin of the Lcd to the 5V pin on the Arduino .

connect the A pin to one end of the resistor and the other end of the resistor to the Lcd VDD pin.

Connect ultrasonic sensor :

Connect the vcc pin of the ultrasonic sensor to the 5V pin on the Arduino.

Connect the Trig pin of the ultrasonic sensor to the D8 pin on the Arduino.

Connect the Echo pin of the ultrasonic sensor to the D9 pin on the Arduino.

Connect the Gnd pin of the ultrasonic sensor to the Gnd pin on the Arduino.

Connect push button:

Connect the +ve pin of the push button to the D10 pin on the Arduino.

Connect the -ve pin of the push button to the Gnd pin on the Arduino.

Connect switch:

Connect the +ve pin of the switch to the D11 pin on the Arduino

Connect the -ve pin of the switch to the Gnd pin on the Arduino.

Connect Dpdt relay:

Connect the coil 2 of the Relay to the D12 pin on the Arduino.

Connect the coil 1 of the Relay to the Gnd pin on the Arduino.

Connect the led Anode to one end of the Resistor and the other end of the Resistor to the NC1 pin on the Relay .

Connect the Led cathode to the coil 1 pin on the relay.

To begin your project, click this template link:

Simulate on Wokwi

ARDUINO CODE


 #include (EEPROM.h)

#include (LiquidCrystal.h)
LiquidCrystal lcd(2,3,4,5,6,7);

long duration, inches;
int set_val,percentage;
bool state,pump;

void setup() {
  
  lcd.begin(16, 2);
  lcd.print("WATER LEVEL:");
  lcd.setCursor(0, 1); 
  lcd.print("PUMP:OFF MANUAL");
  
  pinMode(8, OUTPUT);
  pinMode(9, INPUT);
  pinMode(10, INPUT_PULLUP);
  pinMode(11, INPUT_PULLUP);
  pinMode(12, OUTPUT);
  
   set_val=EEPROM.read(0);
   if(set_val>150)set_val=150;
}
void loop() {
  
   digitalWrite(3, LOW);
   delayMicroseconds(2);
   digitalWrite(8, HIGH);
   delayMicroseconds(10);
   digitalWrite(8, LOW);
   duration = pulseIn(9, HIGH);
   inches = microsecondsToInches(duration);
   
   percentage=(set_val-inches)*100/set_val;
   
   lcd.setCursor(12, 0); 
   if(percentage<0)percentage=0;
   lcd.print(percentage);
   lcd.print("%   ");
    
   if(percentage<30&digitalRead(11))pump=1;
   if(percentage>99)pump=0;
   digitalWrite(12,!pump);
     
   lcd.setCursor(5, 1);
   if(pump==1)lcd.print("ON ");
   else if(pump==0) lcd.print("OFF");
   
    lcd.setCursor(9, 1);
    if(!digitalRead(11))lcd.print("MANUAL");
    else lcd.print("AUTO   ");
    
    if(!digitalRead(10)&!state&digitalRead(11)){
      state=1;
      set_val=inches;
      EEPROM.write(0, set_val);
      }
      
     if(!digitalRead(10)&!state&!digitalRead(11)){
        state=1;
        pump=!pump;
     
      }
      
    if(digitalRead(10))state=0;
      
    
    delay(500);
}
long microsecondsToInches(long microseconds) {
   return microseconds / 74 / 2;
}

INSTRUCTIONS

Assemble the circuit by connecting all components as shown in the schematic diagram.

On the left side of the screen, open sketch.ino and write your Arduino code.

After completing the circuit and writing the code, click the green Play button to start the simulation.

The controller uses sensors and an Arduino to automatically or manually turn the motor ON or OFF based on the tank’s water level.

WORKING PRINCIPLE

The system uses sensors to detect water levels and controls a motor via an Arduino . It runs automatically based on tank levels or manually through a switch, with all logic coded and tested in the simulation.

Project Link

for your reference.