Monitoring Level Tangki Air dengan Sensor Pressure Berbasis ESP 8266

#include <ThingSpeak.h>

#include <ESP8266WiFi.h>

int inputpressure = A0;

//lcd

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

// defenisi variabel

float bacapressure;

float pressure;

float rumus; 

float konstan = 0.13158; 

float maxi = 935;

float zero = 175; //(kalo kekecilan hasil psi-nya, ini naikkan) paling 168

float range = 100;

// Hostpot

const char *ssid =  "ATKNet_MeetingRoom";

const char *pass =  "";

//const char *ssid =  "P_Guest";

//const char *pass =  "Phktjaya";

//const char *ssid =  "RANACITTA";

//const char *pass =  "Pandakgede999";

WiFiClient client;

//thingspeak settings

unsigned long channel = 1995294; //your channel ID number

const char *apiKey = "X1VWYOYR7WD8G3SI"; //your channel write API Key

void setup() {

  lcd.begin(); //lcd inisiasi

  pinMode(inputpressure, INPUT);

  Serial.begin(115200);

  delay(10);

  //connect to WiFi

  Serial.print("Connecting to: "); Serial.println(ssid);

  WiFi.begin(ssid, pass);

  

  while (WiFi.status() != WL_CONNECTED) {

    delay(500);

    Serial.print(".");

  }

  Serial.println("\nWiFi connected\n");

  ThingSpeak.begin(client); //initialize ThingSpeak

}

void loop() {

bacapressure = analogRead(inputpressure);

//rumus = ((bacapressure*5)/1024);

//rumus = ((bacapressure * 100)/1024); //dikurangin 29, karena saat nol, ada nilai 29

//rumus = ((bacapressure-175)*konstan);

rumus = ((bacapressure-zero)*(range/(maxi-zero)));

pressure = map(rumus, 0, 6.2, 0, 100 ); 

//pressure = map(rumus, 0, 6, 0, 100 ); //dimapping agar pressure 0-6 psi mewakili 0-100%

  Serial.print("Pressure: ");

  Serial.println(rumus);

  delay(200);

  int x = ThingSpeak.writeField(channel, 1, pressure, apiKey);

  if (x == 200) {

    Serial.println("Data " + String(pressure));

    Serial.print("pressure: "); Serial.println(pressure);

    Serial.println("Update to ThingSpeak Successful.");

  }

  else {

    Serial.println("Data " + String(pressure));

    Serial.println("Problem updating data. HTTP error code " + String(x));

  }

  Serial.println("Waiting...\n");

  lcd.setCursor(0,0);

  lcd.print("TANK LEVEL LQ");

  lcd.setCursor(0,1);

  lcd.print(pressure, 1);

  lcd.print(" %");

  //lcd.print(bacapressure);

  //lcd.print(" bit");

  delay(20000);

}