ESP32 WebServer DIY Irrigation Kit

#include <WiFi.h>
#include <time.h>
#include <ESPAsyncWebServer.h>

// Define your pins
#define MOISTURE_SENSOR_PIN 34
#define RELAY_PIN 13

// Initial thresholds
int MOISTURE_MIN = 300;
int MOISTURE_MAX = 800;

AsyncWebServer server(80);

unsigned long lastWateringTime = 0;
time_t pumpActivationTime = 0;

const char* ntpServer = "pool.ntp.org";
const long  gmtOffset_sec = 0;
const int   daylightOffset_sec = 3600;

const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

void setup(){
  Serial.begin(115200);
  pinMode(MOISTURE_SENSOR_PIN, INPUT);
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, HIGH);

  connectToWiFi();
  setupNTP();
  setupServer();
}

void loop(){
  int soilMoisture = getSoilMoisture();

  time_t now;
  time(&now);

  if(soilMoisture < 50 || now >= pumpActivationTime) {
    digitalWrite(RELAY_PIN, LOW);
    lastWateringTime = millis();
    pumpActivationTime = 0;
  } else {
    digitalWrite(RELAY_PIN, HIGH);
  }
}

void connectToWiFi() {
  Serial.print("Connecting to WiFi...");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
  Serial.println("\nConnected to WiFi");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());
}

void setupNTP() {
  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
}

void setupServer() {
  server.on("/status", HTTP_GET, handleGetStatus);
  server.on("/setMinMoisture", HTTP_GET, handleSetMinMoisture);
  server.on("/setMaxMoisture", HTTP_GET, handleSetMaxMoisture);
  server.on("/setPumpTime", HTTP_GET, handleSetPumpTime);

  server.begin();
}

void handleGetStatus(AsyncWebServerRequest *request) {
  String message = "Soil moisture: ";
  message += String(getSoilMoisture());
  message += "%\nLast watering: ";
  message += String((millis() - lastWateringTime)/60000);
  message += " minutes ago";
  request->send(200, "text/plain", message);
}

void handleSetMinMoisture(AsyncWebServerRequest *request){
  handleSetParameter(request, MOISTURE_MIN, "value", "New minimum moisture set to ", "Minimum moisture must be less than maximum moisture.");
}

void handleSetMaxMoisture(AsyncWebServerRequest *request){
  handleSetParameter(request, MOISTURE_MAX, "value", "New maximum moisture set to ", "Maximum moisture must be greater than minimum moisture.");
}

void handleSetPumpTime(AsyncWebServerRequest *request){
  handleSetParameter(request, pumpActivationTime, "timestamp", "Pump set to activate at ", "Invalid timestamp.");
}

void handleSetParameter(AsyncWebServerRequest *request, int &parameter, const char* paramName, String successMessage, String errorMessage) {
  String message;
  if(request->hasParam(paramName)) {
    int newValue = request->getParam(paramName)->value().toInt();
    if(newValue > 0) {
      parameter = newValue;
      message = successMessage;
      message += String(parameter);
    } else {
      message = errorMessage;
    }
  } else {
    message = "No value provided.";
  }
  request->send(200, "text/plain", message);
}

int getSoilMoisture() {
  return map(analogRead(MOISTURE_SENSOR_PIN), MOISTURE_MIN, MOISTURE_MAX, 0, 100);
}