├── ESP32_BLE_DHT11_2_0.aia
├── README.md
└── esp32-ble-dht11.ino


/ESP32_BLE_DHT11_2_0.aia:
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https://raw.githubusercontent.com/makerhero/esp32-ble-dht11/788585b679922259134c287dbcd1e868ee458a7c/ESP32_BLE_DHT11_2_0.aia


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/README.md:
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1 | [![N|Solid](https://www.makerhero.com/wp-content/uploads/2023/02/makerhero-logo.svg)](https://filipeflop.com)
2 | 
3 | # Bluetooth Low Energy com ESP32 e DHT11
4 | 
5 | ![ESP32 BLE DHT11](https://www.filipeflop.com/wp-content/uploads/2018/03/imagem001.jpg)
6 | 
7 | ### Acesse o tutorial no <span style="color:blue"></span>[Blog da MakerHero](https://www.makerhero.com/blog/bluetooth-low-energy-com-esp32-e-dht11/) para mais informações sobre este projeto.
8 | 


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/esp32-ble-dht11.ino:
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  1 | /* 
  2 |  *  Programa baseado no programa original desenvolvido por Timothy Woo 
  3 |  *  Tutorial do projeto original; https://www.hackster.io/botletics/esp32-ble-android-arduino-ide-awesome-81c67d
  4 |  *  Modificado para ler dados do sensor DHT11
  5 |  */  
  6 | #include <BLEDevice.h>
  7 | #include <BLEServer.h>
  8 | #include <BLEUtils.h>
  9 | #include <BLE2902.h>
 10 | 
 11 | #include <DHT.h>
 12 | 
 13 | #include <iostream>
 14 | #include <string>
 15 | 
 16 | BLECharacteristic *pCharacteristic;
 17 | 
 18 | bool deviceConnected = false;
 19 | const int LED = 2; // Could be different depending on the dev board. I used the DOIT ESP32 dev board.
 20 | 
 21 | /*
 22 |  * Definição do DHT11
 23 |  */
 24 | #define DHTPIN 23 // pino de dados do DHT11
 25 | #define DHTTYPE DHT11 // DHT 11
 26 | 
 27 | DHT dht(DHTPIN, DHTTYPE);
 28 | 
 29 | int humidity;
 30 | int temperature;
 31 | 
 32 | // Veja o link seguinte se quiser gerar seus próprios UUIDs:
 33 | // https://www.uuidgenerator.net/
 34 | 
 35 | #define SERVICE_UUID           "6E400001-B5A3-F393-E0A9-E50E24DCCA9E" // UART service UUID
 36 | #define CHARACTERISTIC_UUID_RX "6E400002-B5A3-F393-E0A9-E50E24DCCA9E"
 37 | #define DHTDATA_CHAR_UUID "6E400003-B5A3-F393-E0A9-E50E24DCCA9E" 
 38 | 
 39 | 
 40 | class MyServerCallbacks: public BLEServerCallbacks {
 41 |     void onConnect(BLEServer* pServer) {
 42 |       deviceConnected = true;
 43 |     };
 44 | 
 45 |     void onDisconnect(BLEServer* pServer) {
 46 |       deviceConnected = false;
 47 |     }
 48 | };
 49 | 
 50 | class MyCallbacks: public BLECharacteristicCallbacks {
 51 |     void onWrite(BLECharacteristic *pCharacteristic) {
 52 |       std::string rxValue = pCharacteristic->getValue();
 53 |       Serial.println(rxValue[0]);
 54 | 
 55 |       if (rxValue.length() > 0) {
 56 |         Serial.println("*********");
 57 |         Serial.print("Received Value: ");
 58 | 
 59 |         for (int i = 0; i < rxValue.length(); i++) {
 60 |           Serial.print(rxValue[i]);
 61 |         }
 62 |         Serial.println();
 63 |         Serial.println("*********");
 64 |       }
 65 | 
 66 |       // Processa o caracter recebido do aplicativo. Se for A acende o LED. B apaga o LED
 67 |       if (rxValue.find("A") != -1) { 
 68 |         Serial.println("Turning ON!");
 69 |         digitalWrite(LED, HIGH);
 70 |       }
 71 |       else if (rxValue.find("B") != -1) {
 72 |         Serial.println("Turning OFF!");
 73 |         digitalWrite(LED, LOW);
 74 |       }
 75 |     }
 76 | };
 77 | 
 78 | void setup() {
 79 |   Serial.begin(115200);
 80 | 
 81 |   pinMode(LED, OUTPUT);
 82 | 
 83 |   // Create the BLE Device
 84 |   BLEDevice::init("ESP32 DHT11"); // Give it a name
 85 | 
 86 |   // Configura o dispositivo como Servidor BLE
 87 |   BLEServer *pServer = BLEDevice::createServer();
 88 |   pServer->setCallbacks(new MyServerCallbacks());
 89 | 
 90 |   // Cria o servico UART
 91 |   BLEService *pService = pServer->createService(SERVICE_UUID);
 92 | 
 93 |   // Cria uma Característica BLE para envio dos dados
 94 |   pCharacteristic = pService->createCharacteristic(
 95 |                       DHTDATA_CHAR_UUID,
 96 |                       BLECharacteristic::PROPERTY_NOTIFY
 97 |                     );
 98 |                       
 99 |   pCharacteristic->addDescriptor(new BLE2902());
100 | 
101 |   // cria uma característica BLE para recebimento dos dados
102 |   BLECharacteristic *pCharacteristic = pService->createCharacteristic(
103 |                                          CHARACTERISTIC_UUID_RX,
104 |                                          BLECharacteristic::PROPERTY_WRITE
105 |                                        );
106 | 
107 |   pCharacteristic->setCallbacks(new MyCallbacks());
108 | 
109 |   // Inicia o serviço
110 |   pService->start();
111 | 
112 |   // Inicia a descoberta do ESP32
113 |   pServer->getAdvertising()->start();
114 |   Serial.println("Esperando um cliente se conectar...");
115 | }
116 | 
117 | void loop() {
118 |   if (deviceConnected) {
119 | 
120 |     humidity = dht.readHumidity();
121 |     temperature = dht.readTemperature();
122 |     // testa se retorno é valido, caso contrário algo está errado.
123 |     if (isnan(temperature) || isnan(humidity)) 
124 |     {
125 |       Serial.println("Failed to read from DHT");
126 |     }
127 |     else 
128 |     {
129 |       Serial.print("Umidade: ");
130 |       Serial.print(humidity);
131 |       Serial.print(" %\t");
132 |       Serial.print("Temperatura: ");
133 |       Serial.print(temperature);
134 |       Serial.println(" *C");
135 |     }
136 |     
137 |     char humidityString[2];
138 |     char temperatureString[2];
139 |     dtostrf(humidity, 1, 2, humidityString);
140 |     dtostrf(temperature, 1, 2, temperatureString);
141 | 
142 |     char dhtDataString[16];
143 |     sprintf(dhtDataString, "%d,%d", temperature, humidity);
144 |     
145 |     pCharacteristic->setValue(dhtDataString);
146 |     
147 |     pCharacteristic->notify(); // Envia o valor para o aplicativo!
148 |     Serial.print("*** Dado enviado: ");
149 |     Serial.print(dhtDataString);
150 |     Serial.println(" ***");
151 |   }
152 |   delay(1000);
153 | }
154 | 


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