Jaume Miralles
Published © GPL3+

Monitoring temperature and humidity with ESP32

A very easy way to share, graph and log the data from your ESP32

IntermediateProtip2 hours499
Monitoring temperature and humidity with ESP32

Things used in this project

Hardware components

ESP32 DEVKITV1
×1
DHT11 Temperature & Humidity Sensor (4 pins)
DHT11 Temperature & Humidity Sensor (4 pins)
×1

Software apps and online services

circusofthings.com

Story

Read more

Schematics

CircusESP32Lib

The library (with examples) you need for your ESP32

The sketch

The .ino skecth to run the tutorial. It's easy to modify for your prefered sensors

Code

Code snippet #1

Plain text
#include <CircusESP32Lib.h>

// ------------------------------------------------
// These are the CircusESP32Lib related declarations
// ------------------------------------------------

char ssid[] = "your_ssid_here"; // Place your wifi SSID here
char password[] =  "your_password_here"; // Place your wifi password here
char server[] = "www.circusofthings.com";
char temperature_key[] = "31898";  // Place the Key of the signal you created at Circus Of Things for the Temperature
char humidity_key[] = "6066";  // Place the Key of the signal you created at Circus Of Things for the Humidity
char token[] = ""your_token_here; // Place your token, find it in 'account' at Circus. It will identify you.
CircusESP32Lib circusESP32(server,ssid,password); // The object representing an ESP32 to whom you can order to Write or Read

// ------------------------------------------------
// These are the Temperature Example related declarations
// ------------------------------------------------

#define DHTPIN 27      // digital of your ESP32 connected to DHT11
#define DHTTYPE DHT11 // exact model of temperature sensor DHT 11 for the general library
DHT dht(DHTPIN, DHTTYPE); // The object representing your DHT11 probe


 
void setup() {
    dht.begin(); // Set the DHT11 ready
    Serial.begin(115200); // Remeber to match this value with the baud rate in your console
    delay(4000); // Let time for the Wifi to set up properly
    WiFi.begin(ssid, password); // Connect to your Wifi with the paremeters you provided at the begining
    while (WiFi.status() != WL_CONNECTED) {
        delay(1000);
        Serial.println("Connecting to WiFi..");
    }
    if ((WiFi.status() == WL_CONNECTED)) {
        circusESP32.getCertificate(); // Don't bother for SSL certificates. This method will fetch it for you
    }

}
 
void loop() { // Now that all is set up, let's begin with the tasks

    delay(10000);
    float t = dht.readTemperature(); // Let the library get the Temperature that DHT11 probe is measuring.
    if (isnan(t)) {
        t=-1; // if so, check the connection of your DHT11 sensor... something is disconnected ;-)
    }
    float h = dht.readHumidity();
    if (isnan(h)) {
        h=-1; // if so, check the connection of your DHT11 sensor... something is disconnected ;-)
    }
    Serial.println("");
    Serial.print("Temperature: ");
    Serial.println(t);
    Serial.print("Humidity: ");
    Serial.println(h);
    if ((WiFi.status() == WL_CONNECTED)) {
        circusESP32.write(temperature_key,t,token); // Report the temperature measured to Circus.
        circusESP32.write(humidity_key,h,token); // Report the humidity measured to Circus.
    }
    
}

Code snippet #2

Plain text
#include <CircusESP32Lib.h>

// ------------------------------------------------
// These are the CircusESP32Lib related declarations
// ------------------------------------------------

char ssid[] = "your_ssid_here"; // Place your wifi SSID here
char password[] =  "your_password_here"; // Place your wifi password here
char server[] = "www.circusofthings.com";
char temperature_key[] = "31898";  // Place the Key of the signal you created at Circus Of Things for the Temperature
char humidity_key[] = "6066";  // Place the Key of the signal you created at Circus Of Things for the Humidity
char token[] = ""your_token_here; // Place your token, find it in 'account' at Circus. It will identify you.
CircusESP32Lib circusESP32(server,ssid,password); // The object representing an ESP32 to whom you can order to Write or Read

// ------------------------------------------------
// These are the Temperature Example related declarations
// ------------------------------------------------

#define DHTPIN 27      // digital of your ESP32 connected to DHT11
#define DHTTYPE DHT11 // exact model of temperature sensor DHT 11 for the general library
DHT dht(DHTPIN, DHTTYPE); // The object representing your DHT11 probe


 
void setup() {
    dht.begin(); // Set the DHT11 ready
    Serial.begin(115200); // Remeber to match this value with the baud rate in your console
    delay(4000); // Let time for the Wifi to set up properly
    WiFi.begin(ssid, password); // Connect to your Wifi with the paremeters you provided at the begining
    while (WiFi.status() != WL_CONNECTED) {
        delay(1000);
        Serial.println("Connecting to WiFi..");
    }
    if ((WiFi.status() == WL_CONNECTED)) {
        circusESP32.getCertificate(); // Don't bother for SSL certificates. This method will fetch it for you
    }

}
 
void loop() { // Now that all is set up, let's begin with the tasks

    delay(10000);
    float t = dht.readTemperature(); // Let the library get the Temperature that DHT11 probe is measuring.
    if (isnan(t)) {
        t=-1; // if so, check the connection of your DHT11 sensor... something is disconnected ;-)
    }
    float h = dht.readHumidity();
    if (isnan(h)) {
        h=-1; // if so, check the connection of your DHT11 sensor... something is disconnected ;-)
    }
    Serial.println("");
    Serial.print("Temperature: ");
    Serial.println(t);
    Serial.print("Humidity: ");
    Serial.println(h);
    if ((WiFi.status() == WL_CONNECTED)) {
        circusESP32.write(temperature_key,t,token); // Report the temperature measured to Circus.
        circusESP32.write(humidity_key,h,token); // Report the humidity measured to Circus.
    }
    
}

Credits

Jaume Miralles

Jaume Miralles

5 projects • 33 followers

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