// IoT waterpump written by s.jashuva email - [email protected]
#define BLYNK_TEMPLATE_ID "TMPL3eiNE1QQe"
#define BLYNK_TEMPLATE_NAME "IoT waterpump"
#define BLYNK_AUTH_TOKEN "EBAt8dQcSNDQnWLUxX_47HnS4PH04XwH"

#define BLYNK_PRINT Serial

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST"; // WiFi SSID name
char pass[] = ""; // WiFi password

#define virtuallevel V0 // guage widget on Blynk app 
#define virtualMode V1 // mode widget on blynk app
#define virtualPump V2 // pump widget on blynk app 

const int trigger = 33; // trig connected to D4
const int echo = 25; // echo connected to D3
const int pump = 26; // pump connected to D5

int modevalue = 0;
int pumpvalue = 0;
bool mode = true; 

long duration;
float distance;
int waterlevel;

int levellow = 300; // minimum tank depth
int levelhigh = 100; // maximum thersold level

int pumpstate = LOW;

BLYNK_WRITE(virtualMode) {
    modevalue = param.asInt();
    mode = (modevalue == 0) ? true : false;
}

BLYNK_WRITE(virtualPump) {
    pumpvalue = param.asInt();
}

void setup() {
    Blynk.begin(auth, ssid, pass);
    pinMode(trigger, OUTPUT);
    pinMode(echo, INPUT);
    pinMode(pump, OUTPUT);
}

void tanklevel() {
    digitalWrite(trigger, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigger, LOW);

    duration = pulseIn(echo, HIGH);
    distance = duration * 0.017;

    waterlevel = ((distance - levellow) / (levelhigh - levellow)) * 100;

    if (waterlevel < 0) {
        waterlevel = 0;
    }

    if (waterlevel > 100) {
        waterlevel = 100;
    }

    Blynk.virtualWrite(virtuallevel, waterlevel);
}

void pumpAutomate() {
    if (mode) {
        if (waterlevel >= 95) {
            pumpstate = LOW;
        } else if (waterlevel <= 5) {
            pumpstate = HIGH;
        }
        Blynk.virtualWrite(virtualPump, pumpstate);
    } else {
        pumpstate = pumpvalue ? HIGH : LOW;
    }
}

void modeShift(){
    if(waterlevel >= 85 || waterlevel <= 15){
    if(!mode){
        mode = true;
        Blynk.virtualWrite(virtualMode, mode);
    }
}
}

void loop() {
    Blynk.run();

    tanklevel();

    modeShift();

    pumpAutomate();
    
    digitalWrite(pump, pumpstate);
}