Arduino+ water level sensor +led display + buzzer alarm

Experiment preparation ：

        arduino mega2560（uno、Nano And other models ）

        led（ yellow 、 green 、 red ）

         resistance x3（ This time I choose 680Ω resistance 1/4w Metal film resistance , avoid led When the lamp is burnt out, pay attention to the resistance value is not too small ）

         Buzzer （ Here I use active high-level trigger ）

         Water level sensor （ as follows ）

water sensor

  Wiring （ The latter can be wired according to the provider ）

Experimental procedure

#define water_sensorspin A1
#define led_yellow 2     
#define led_green 3
#define led_red 4
#define buzzpin 7
float ad_value=0;   // Depth analog value  
float deepcm=0;     // Actual depth 


void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(led_yellow,OUTPUT);    // Set pin status 
  pinMode(led_green,OUTPUT);
  pinMode(led_red,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  ad_value=analogRead(water_sensorspin);         //A1 The pin gets the analog value and assigns the variable 
  Serial.println("Water level monitoring ready");
  delay(20);
  Serial.println(ad_value);               // Print and observe the change of analog value 
  deepcm=(ad_value/702)*4;                // Measured , At the deepest point, the analog value is about 702, Measure the depth 4cm
  Serial.print(" At this time, the depth of water is :");
  Serial.print(deepcm);
  Serial.println("cm");
  if(deepcm<1.5)          // The water level is lower than 1.5cm when 
  {
   delay(20);
   digitalWrite(led_yellow,HIGH);
   digitalWrite(led_green,LOW);
   digitalWrite(led_red,LOW);
   digitalWrite(buzzpin,LOW);
   }
   else if(deepcm<3)
   {
   delay(20);
   digitalWrite(led_yellow,LOW);
   digitalWrite(led_green,HIGH);
   digitalWrite(led_red,LOW);
   digitalWrite(buzzpin,LOW);
    }
    else if(deepcm>3)
    {
   delay(20);
   digitalWrite(led_yellow,LOW);
   digitalWrite(led_green,LOW);
   digitalWrite(led_red,HIGH);
   digitalWrite(buzzpin,HIGH);
   Serial.println(" The water level is too high , Be careful ！");
     }
   delay(2000);        // The delay jam is slightly longer , The serial port refresh is too fast to see 
   
}

Experimental phenomena

  The water level sensor is inserted into the water （ Note that the maximum depth should not exceed 4cm）

  When the depth is shallow

 

 

Moderate depth

  When the depth is deep

video

The water level led Show

Buzzer alarm

Basics ：led Lighten up , Buzzer alarm

Add other displays to the sensor access