#include <WiFi.h>
#include <HX711.h>
#include <ThingSpeak.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";

const char* thingSpeakApiKey = "2J4LISME87ZWZ9AD";
const unsigned long postingInterval = 60000; // Interval at which to update ThingSpeak (in milliseconds)

const int HX711_dout = 21; // Pin connected to HX711's DOUT pin
const int HX711_sck = 22; // Pin connected to HX711's SCK pin

const int buzzerPin = 19; // Pin connected to the buzzer

HX711 scale;

WiFiClient client;

unsigned long lastConnectionTime = 0;

void setup() {
  Serial.begin(115200);
  
  pinMode(buzzerPin, OUTPUT);
  
  scale.begin(HX711_dout, HX711_sck);
  scale.set_scale();
  scale.tare();
  
  WiFi.begin(ssid, password);
  ThingSpeak.begin(client);
}

void loop() {
  if (WiFi.status() == WL_CONNECTED) {
    if (millis() - lastConnectionTime >= postingInterval) {
      float weight = scale.get_units(10); // Get weight in kg
      Serial.print("Weight: ");
      Serial.println(weight);
      
      if (weight > 25) {
        digitalWrite(buzzerPin, HIGH); // Turn on the buzzer
      } else {
        digitalWrite(buzzerPin, LOW); // Turn off the buzzer
      }
      
      ThingSpeak.writeField(1, (float)weight, thingSpeakApiKey);
      
      lastConnectionTime = millis();
    }
  } else {
    Serial.println("WiFi not connected!");
    delay(1000);
  }
}