#include <DHTesp.h> // DHT for ESP32 library
#include <WiFi.h> // WiFi control for ESP32
#include <ThingsBoard.h> // ThingsBoard SDK
// WiFi access point
#define WIFI_AP_NAME "Wokwi-GUEST"
// WiFi password
#define WIFI_PASSWORD ""
//#define TOKEN "O6Bm0tyPiW2Z068zfUEZ"
//#define THINGSBOARD_SERVER "83.212.98.154"
#define TOKEN "tVuk3uMFXFR0tOwsvSkw"
#define THINGSBOARD_SERVER "194.24.226.112"
// Baud rate for debug serial
#define SERIAL_DEBUG_BAUD 115200
// Initialize ThingsBoard client
WiFiClient espClient;
// Initialize ThingsBoard instance
ThingsBoard tb(espClient);
// the Wifi radio's status
int status = WL_IDLE_STATUS;
// DHT object
DHTesp dht;
// ESP32 pin used to query DHT22
#define DHT_PIN 15
// Main application loop delay
int quant = 20;
// Period of sending a temperature/humidity data.
int send_delay = 4000;
// Time passed after temperature/humidity data was sent, milliseconds.
int send_passed = 0;
// Setup an application
void setup() {
// Initialize serial for debugging
Serial.begin(SERIAL_DEBUG_BAUD);
WiFi.begin(WIFI_AP_NAME, WIFI_PASSWORD);
InitWiFi();
// Initialize temperature sensor
dht.setup(DHT_PIN, DHTesp::DHT22);
}
// Main application loop
void loop() {
delay(quant);
send_passed += quant;
// Reconnect to WiFi, if needed
if (WiFi.status() != WL_CONNECTED) {
reconnect();
return;
}
// Reconnect to ThingsBoard, if needed
if (!tb.connected()) {
// Connect to the ThingsBoard
Serial.print("Connecting to: ");
Serial.print(THINGSBOARD_SERVER);
Serial.print(" with token ");
Serial.println(TOKEN);
if (!tb.connect(THINGSBOARD_SERVER, TOKEN)) {
Serial.println("Failed to connect");
return;
}
}
// Check if it is a time to send DHT22 temperature and humidity
if (send_passed > send_delay) {
Serial.println("Sending data...");
tb.sendTelemetryFloat("temperature", dht.getTemperature());
// tb.sendTelemetryFloat("humidity", dht.getHumidity());
// }
send_passed = 0;
}
// Process messages
tb.loop();
}
void InitWiFi()
{
Serial.println("Connecting to AP ...");
// attempt to connect to WiFi network
WiFi.begin(WIFI_AP_NAME, WIFI_PASSWORD);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("Connected to AP");
}
void reconnect() {
// Loop until we're reconnected
status = WiFi.status();
if ( status != WL_CONNECTED) {
WiFi.begin(WIFI_AP_NAME, WIFI_PASSWORD);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("Connected to AP");
}
}