esp32s-garden-sensors.ino

// ESP 32s DevKit

#include <WiFi.h>
//#include <HTTPClient.h>
#include <DHT.h>

String THINGSPEAK_API_KEY = "";

const char *ssid =  "";
const char *pass =  "";
const char *server = "api.thingspeak.com";

//const int APIN_EMPTY = 35;
const int APIN_SOIL_HUM = 33;
const int APIN_LDR = 34;
const int APIN_RAIN = 35;
//const int APIN_EMPTY = 36;

const int DPIN_RAIN = 4;
const int DPIN_DHT11 = 23;

WiFiClient client;
DHT dht(DPIN_DHT11, DHT11);

void connectWiFi() {

  delay(100);
  
  WiFi.begin(ssid, pass);

  Serial.print("Conectando em ");
  Serial.print(ssid);

  int timeout = 0;

  while (WiFi.status() != WL_CONNECTED && ++timeout <= 10) {
    digitalWrite(BUILTIN_LED, HIGH);
    delay(500);
    digitalWrite(BUILTIN_LED, LOW);
    delay(500);
    Serial.print("."); 
  }

  if (WiFi.status() != WL_CONNECTED) {
    Serial.println(" Conexão não estabelecida. Reiniciando...");
    ESP.restart();
  }

  Serial.println("");
  Serial.print("Conectado em ");
  Serial.print(ssid);
  Serial.print(" com o IP ");
  Serial.println(WiFi.localIP());
}

void setup() {

  Serial.begin(115200);

  pinMode(DPIN_RAIN, INPUT);
  pinMode(BUILTIN_LED,OUTPUT);

  connectWiFi();

  delay(10);
  dht.begin();

}

void sendDataToServer(float humidity, float temperature, float soilMoisture, int luminosity, int rainIntensity, boolean isRaining) {
  
  if (client.connect(server, 80)) {
  
    String postStr = THINGSPEAK_API_KEY;
    
    postStr +="&field1=";
    postStr += String(temperature);
    postStr +="&field2=";
    postStr += String(humidity);
    postStr +="&field3=";
    postStr += soilMoisture;
    postStr +="&field4=";
    postStr += rainIntensity;
    postStr +="&field5=";
    postStr += isRaining;
    postStr +="&field6=";
    postStr += luminosity;
    postStr += "\r\n\r\n";
    
    client.print("POST /update HTTP/1.1\n");
    client.print("Host: api.thingspeak.com\n");
    client.print("Connection: close\n");
    client.print("X-THINGSPEAKAPIKEY: " + THINGSPEAK_API_KEY + "\n");
    client.print("Content-Type: application/x-www-form-urlencoded\n");
    client.print("Content-Length: ");
    client.print(postStr.length());
    client.print("\n\n");
    client.print(postStr);
    
//    Serial.print("Umidade do solo: ");
//    Serial.print(soilMoisture);
//    Serial.print("% (");
//
//    if (soilMoisture <= 30) {
//      Serial.print("Seco");
//    }
// 
//    if (soilMoisture > 30 && soilMoisture <= 50) {
//      Serial.print("Moderado"); 
//    }
//   
//    if (soilMoisture > 50 && soilMoisture <= 85) {
//      Serial.print("Umido");
//    }
//
//    if (soilMoistureumidity > 85) {
//      Serial.print("Encharcado");
//    }
//
//    Serial.println(")");
//
//    Serial.print("Temperatura: ");
//    Serial.print(temperature);
//    Serial.println("º C");
//    Serial.print("Umidade do ar: ");
//    Serial.print(humidity);
//    Serial.println("%");

    delay(1000);
    Serial.println("Dados enviados.");
  
  } else {
    Serial.println("Falha ao enviar os dados!");
  }
  
  client.stop();
}

void loop() {

  delay(500);

  int soilMoisture = 100 - (analogRead(APIN_SOIL_HUM) * 100 ) / 4095;
  Serial.print("APIN_SOIL_HUM => ");
  Serial.print(soilMoisture);
  Serial.println("%");
  
  int luminosity = 100 - (analogRead(APIN_LDR) * 100) / 4095;
  Serial.print("APIN_LDR => ");
  Serial.print(luminosity);
  Serial.println("%");

  int rainIntensity = 100 - (analogRead(APIN_RAIN) * 100) / 4095;
  Serial.print("APIN_RAIN => ");
  Serial.print(rainIntensity);
  Serial.println("%");

  boolean isRaining = !(digitalRead(DPIN_RAIN));
  Serial.print("DPIN_RAIN => ");
  Serial.println(isRaining);

  float humidity = dht.readHumidity();
  Serial.print("DPIN_DHT11 H => ");
  Serial.print(humidity);
  Serial.println("%");

  float temperature = dht.readTemperature();
  Serial.print("DPIN_DHT11 T => ");
  Serial.print(temperature);
  Serial.println("ºC");

  if (isnan(humidity) || isnan(temperature)) {
    digitalWrite(BUILTIN_LED, HIGH);
    Serial.println("Falha no sensor DHT11!");
    delay(100);
    digitalWrite(BUILTIN_LED, LOW);
    delay(100);
    return;
  }

  sendDataToServer(humidity, temperature, soilMoisture, luminosity, rainIntensity, isRaining);

  Serial.println("Proxima leitura em 60 segundos");

  delay(60000);

}