$($Correct this code Node MCU for water level detection $)$

#define BLYNK$\_$TEMPLATE$\_$ID $"$TMPL$6$h$10$qEPlA"

#define BLYNK$\_$TEMPLATE$\_$NAME "water level"

#define BLYNK$\_$AUTH$\_$TOKEN "aQLXsDLKNKzBjMs$55$sRXvJyImkA$0$UdGl"

#include

#include

#define BLYNK$\_$PRINT Serial

#include

#include

LiquidCrystal$\_$I$2$C lcd$(0$x$27,16,2)$;

const int lowWaterLevelThreshold $=2$; $//$ Adjust this value based on your requirements

char auth$[]=$ "aQLXsDLKNKzBjMs$55$sRXvJyImkA$0$UdGl";

char ssid$[]=$ "Islington$-$College";

char pass$[]="$I$LiNGT$0$N$2023"$;

BlynkTimer timer;

bool pinValue $=0$;

$//$ Define pins for ultrasonic

int const trigPin $=$ D$3$;

int const echoPin $=$ D$4$;

$//$ Define pins for buzzer

int const buzzPin $=$ D$6$;

$//$ Define pins for motor

int const motorPin $=$ D$5$;

$//$ Define pins for bulb

int const bulbPin $=$ D$7$;

int waterLevel $=0$; $//$ Initial water level

int yourMotionThreshold $=20$; $//$ Adjust this value based on your sensor and environment

void setup$()\{$

lcd.init$()$;

lcd.begin$(16,2)$; $//$ Adjust the numbers based on your LCD specifications

lcd.backlight$()$;

Wire.begin$($D$2,$ D$1)$;

pinMode$($trigPin$,$ OUTPUT$)$;

pinMode$($echoPin$,$ INPUT$)$;

pinMode$($buzzPin$,$ OUTPUT$)$;

pinMode$($motorPin$,$ OUTPUT$)$;

pinMode$($bulbPin$,$ OUTPUT$)$;

Serial.begin$(9600)$;

Blynk$.$begin$($auth$,$ ssid, pass$)$;

timer.setInterval$(10$L$,$ Wlevel$)$;

digitalWrite$($motorPin$,$ HIGH$)$;

digitalWrite$($bulbPin$,$ HIGH$)$; $//$ Assuming bulb is off initially

$\}$

void loop$()\{$

Blynk$.$run$()$;

timer.run$()$;

$//$ Duration will be the input pulse width, and distance will be the distance to the obstacle in centimeters

int duration, distance;

$//$ Output pulse with $1$ms width on trigPin

digitalWrite$($trigPin$,$ HIGH$)$;

delayMicroseconds$(10)$;

digitalWrite$($trigPin$,$ LOW$)$;

$//$ Measure the pulse input in echo pin

duration $=$ pulseIn$($echoPin$,$ HIGH$)$;

$//$ Distance is half the duration divided by $29\mathrm{.}1($from datasheet$)$

distance $=($duration $/2)/29\mathrm{.}1$;

$//$ If distance is less than $0\mathrm{.}5$ meters and more than $0(0$ or less means over the range$)$

if $($distance $<=60$ && distance $>=0)\{$

digitalWrite$($buzzPin$,$ HIGH$)$; $//$ Buzz

lcd.setCursor$(3,0)$;

lcd.print$("$Tank Full"$)$;

pinMode$($motorPin$,$ LOW$)$;

digitalWrite$($bulbPin$,$ HIGH$)$; $//$ Assuming bulb should be ON when tank is full

$\}$ else $\{$

digitalWrite$($buzzPin$,$ HIGH$)$;

pinMode$($motorPin$,$ LOW$)$;

lcd.setCursor$(3,0)$;

lcd.print$("$Hydro Sync$")$;

digitalWrite$($bulbPin$,$ LOW$)$; $//$ Assuming bulb should be OFF when the tank is not full

$//$ Check if water level is low and turn on the motor

if $($waterLevel $<$ lowWaterLevelThreshold$)\{$

pinMode$($motorPin$,$ LOW$)$;

$\}$ else $\{$

pinMode$($motorPin$,$ HIGH$)$;

$\}$

$\}$

delay$(500)$; $//$ Delay for stability

$\}$

void Wlevel$()\{$

digitalWrite$($trigPin$,$ LOW$)$;

delayMicroseconds$(4)$;

digitalWrite$($trigPin$,$ HIGH$)$;

delayMicroseconds$(6)$;

digitalWrite$($trigPin$,$ LOW$)$;

long t $=$ pulseIn$($echoPin$,$ HIGH$)$;

long cm $=$ t $/29/2$;

const int IncrementThreshold $=5$;

$//$ Update water level based on motion detection

if $($cm $<$ yourMotionThreshold$)\{$

waterLevel$++$; $//$ Increment water level

$\}$ else $\{$

$//$ Optionally, set a specific threshold for decrementing the water level

const int decrementThreshold $=5$;

if $($cm $>$ decrementThreshold && waterLevel $>0)\{$

waterLevel$--$; $//$ Decrement water level

$\}$

$\}$

$//$ Update Blynk with the new water level

Blynk$.$virtualWrite$($V$1,$ waterLevel$)$;

Serial.println$($waterLevel$)$; $//$ Print water level to Serial Monitor

lcd.setCursor$(0,0)$;

lcd.print$("$Water Level: $")$;

lcd.print$($waterLevel$)$; $//$ Display water level on LCD

$\}$