Projeto feito para a Global Solution, com a proposta de criar os sensores da nossa clínica de órgãos. Utilizamos uma placa ESP32 para realizar o sensor, utilizamos o Node-RED para a realização do gateway e para a realização do dashboard.
Os fluxos para o Node-RED podem ser encontrados nos arquivos acima dentro do arquivo fluxos-nodered.jpg
Para utilizar o projeto, siga às seguintes instruções:
- Utilize primeiramente uma plataforma de códigos para a execução do código, no nosso caso utilizamos o Wokwi
- Depois, dentro do Wokwi, inicie a aplicação do projeto
- Digite dentro do seu Wokwi o seguinte código:
-
#include <WiFi.h> #include <PubSubClient.h> #include <DHTesp.h> const int DHT_PIN = 15; DHTesp dht; // Configure com os padrões utilizados pela sua rede. const char* ssid = "Wokwi-GUEST"; const char* password = ""; const char* mqtt_server = "test.mosquitto.org"; WiFiClient espClient; PubSubClient client(espClient); unsigned long lastMsg = 0; float temp = 0; float hum = 0; void setup_wifi() { //perintah koneksi wifi delay(10); // Começamos conectando com uma rede Wi-Fi Serial.println(); Serial.print("Connecting to "); Serial.println(ssid); WiFi.mode(WIFI_STA); //setting wifi chip sebagai station/client WiFi.begin(ssid, password); //koneksi ke jaringan wifi while (WiFi.status() != WL_CONNECTED) { //perintah tunggu esp32 sampi terkoneksi ke wifi delay(500); Serial.print("."); } randomSeed(micros()); Serial.println(""); Serial.println("WiFi connected"); Serial.println("IP address: "); Serial.println(WiFi.localIP()); } void callback(char* topic, byte* payload, unsigned int length) { //perintah untuk menampilkan data ketika esp32 di setting sebagai subscriber Serial.print("Message arrived ["); Serial.print(topic); Serial.print("] "); for (int i = 0; i < length; i++) { //mengecek jumlah data yang ada di topik mqtt Serial.print((char)payload[i]); } Serial.println(); // Switch on the LED if an 1 was received as first character if ((char)payload[0] == '1') { digitalWrite(2, LOW); // Turn the LED on (Note that LOW is the voltage level // but actually the LED is on; this is because // it is active low on the ESP-01) } else { digitalWrite(2, HIGH); // Turn the LED off by making the voltage HIGH } } void reconnect() { //perintah koneksi esp32 ke mqtt broker baik itu sebagai publusher atau subscriber // Loop until we're reconnected while (!client.connected()) { Serial.print("Attempting MQTT connection..."); // perintah membuat client id agar mqtt broker mengenali board yang kita gunakan String clientId = "ESP32Client-"; clientId += String(random(0xffff), HEX); // Attempt to connect if (client.connect(clientId.c_str())) { Serial.println("Connected"); // Once connected, publish an announcement... client.publish("/indobot/p/mqtt", "Indobot"); //perintah publish data ke alamat topik yang di setting // ... and resubscribe client.subscribe("/indobot/p/mqtt"); //perintah subscribe data ke mqtt broker } else { Serial.print("failed, rc="); Serial.print(client.state()); Serial.println(" try again in 5 seconds"); // Wait 5 seconds before retrying delay(5000); } } } void setup() { pinMode(2, OUTPUT); // inisialisasi pin 2 / ledbuiltin sebagai output Serial.begin(115200); setup_wifi(); //memanggil void setup_wifi untuk dieksekusi client.setServer(mqtt_server, 1883); //perintah connecting / koneksi awal ke broker client.setCallback(callback); //perintah menghubungkan ke mqtt broker untuk subscribe data dht.setup(DHT_PIN, DHTesp::DHT22);//inisialiasi komunikasi dengan sensor dht22 } void loop() { if (!client.connected()) { reconnect(); } client.loop(); unsigned long now = millis(); if (now - lastMsg > 2000) { //perintah publish data lastMsg = now; TempAndHumidity data = dht.getTempAndHumidity(); String temp = String(data.temperature, 2); //membuat variabel temp untuk di publish ke broker mqtt client.publish("/indobot/p/temp", temp.c_str()); //publish data dari varibel temp ke broker mqtt String hum = String(data.humidity, 1); //membuat variabel hum untuk di publish ke broker mqtt client.publish("/indobot/p/hum", hum.c_str()); //publish data dari varibel hum ke broker mqtt Serial.print("Temperature: "); Serial.println(temp); Serial.print("Humidity: "); Serial.println(hum); } } - Em seguida, abra o Node-RED e copie os fluxos que estarão disponíveis no arquivo fluxos.nodered.jpg
- E por último, insira dentro do Node-RED o seguinte JSON:
[
{
"id": "2f5404c550b1c057",
"type": "ui_gauge",
"z": "530b5f4a309c5367",
"name": "",
"group": "77aa337cec4d48f3",
"order": 1,
"width": 0,
"height": 0,
"gtype": "gage",
"title": "Umidade",
"label": "%",
"format": "{{value}}",
"min": 0,
"max": "100",
"colors": [
"#00b500",
"#e6e600",
"#ca3838"
],
"seg1": "",
"seg2": "",
"diff": false,
"className": "",
"x": 520,
"y": 360,
"wires": []
},
{
"id": "77aa337cec4d48f3",
"type": "ui_group",
"name": "dados hora e cartao",
"tab": "b65ecaa6413acd47",
"order": 1,
"disp": false,
"width": "6",
"collapse": false,
"className": ""
},
{
"id": "b65ecaa6413acd47",
"type": "ui_tab",
"name": "Home",
"icon": "dashboard",
"disabled": false,
"hidden": false
}
]Segue abaixo nome dos integrantes que auxiliaram na realização do projeto:
- Rodrigo Costa Petroni / RM: 93872
- Gustavo Ribeiro Maio / RM: 93211
- Lucas Antunes dos Reis Silva / RM: 95781
- Nickolas Kenji Takeda Maldonado / RM: 95281
- Kauan Altino Gianesini Grilo / RM: 94700
Utilizamos para realizar os sensores as seguintes tecnologias:
- Arduino
- Plataforma Wokwi
- Node-RED
- Placa ESP32
- Protocolo MQTT
- Placa para sensor de umidade e temperatura DHT22
Link para o vídeo referente ao pitch do projeto com explicação dos temas: