Water level measurement using Float Sensor,ESP8266 and Blynk

Robo India presents tutorial on how to measure water level through float sensor using ESP8266 and connection with blynk app.

1. Introduction:

This module is used to measure water level using float sensor, ESP8266 and connecting it to blynk app.

2. Hardware required

S.No.	Item	Quantity
1.	NodeMCU	1
2.	Breadboard	1
3.	Float Sensor	2

3. Connections:

Make the following connections with NodeMCU-

First(Bottom) Sensor-
Connect one end to D1 and another to GND.

Second(Top) Sensor-
Connect one end to D2 and another to GND.

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4. Programming:

Select NodeMCU 1.0( ESP-12E Module ) in Boards.

You may download this Arduino Sketch from here.

#define BLYNK_PRINT Serial
#include <BlynkSimpleEsp8266.h>
BlynkTimer timer;

char auth[]="....";
char ssid[]="....";
char pass[]="....";
int flagB=0;
int flagT=0;

void Buttonstate()
{
  int isBS = digitalRead(5);
  int isTS = digitalRead(4);
 
  if (isBS==1 && flagB==0){
    Serial.println("water level above the Bottom sensor");
    Blynk.virtualWrite(V1,1);
    Blynk.virtualWrite(V2,50);
    flagB=1;
  }
  else if (isBS==0 && flagB==1)
  {
  
    Serial.println("Lower than Bottom sensor");
    Blynk.notify("Lower than Bottom sensor");
    Blynk.virtualWrite(V1,0);
    Blynk.virtualWrite(V2,0);
    flagB=0;
  }

  
 if (isTS==1 && flagT==0){
    Serial.println("Water level above the Top sensor");
    Blynk.notify("Water level above the Top sensor");
    Blynk.virtualWrite(V0,1);
    Blynk.virtualWrite(V2,100);
    flagT=1;
  }
  else if (isTS==0 && flagT==1)
  {
  
    Serial.println("Lower than Top sensor");
    Blynk.virtualWrite(V0,0);
    Blynk.virtualWrite(V2,50);
    flagT=0;
  }
  
}

void setup() {
// put your setup code here, to run once:
Serial.begin(9600);

pinMode(5, INPUT_PULLUP);
pinMode(4, INPUT_PULLUP);

  
Blynk.begin(auth, ssid, pass);
Blynk.virtualWrite(V0,0);
Blynk.virtualWrite(V1,0);
Blynk.virtualWrite(V2,0);
      

timer.setInterval(2000L,Buttonstate);

delay(1000);
}

void loop() {
  // put your main code here, to run repeatedly:
  Blynk.run();
  timer.run();
}

5. Output

Upload the above code to the NodeMCU and open serial monitor. Following output should be shown on the serial monitor.

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If you have any query please write us at support@roboindia.com

Thanks and Regards
Content Development Team 
Robo India
https://roboindia.com