DHT 11 Send Data and Retrieve Data displayed on OLED
In this project, you will use the Antares Workshop Shield on the Lynx-32 Development Board module. In this Antares Shield Workshop, there are temperature, humidity (DHT11), relay, LED, and push button sensors. You will monitor the temperature and humidity with a specified interval period. The data sent by the sensors can be monitored through the Antares console and displayed on the OLED. You can also send messages in the form of string data displayed on the OLED display. This data transmission process uses MQTTX Software to send data to the Antares IoT Platform.
Prerequisites
The materials required follow the General Prerequisites on the previous page. If you have not prepared the requirements on that page, then you can visit the following page.
General Prerequisites ESP32 Wi-FiThe additional materials specific to this project are as follows.
Shield Workshop Antares
I2C-based 0.96inch 128x64 pixel SSD1036 OLED module

Antares ESP HTTP Library. This documentation uses the Antares ESP MQTT library version 1.0.
DHT11 Library. This documentation uses DHT11 Sensor Library version 1.4.4.
SSD1306 OLED Library. This documentation uses Adafruit SSD1306 by Adafruit version 2.5.7.
MQTTX Software
Follow These Steps
1. Launch the Arduino IDE application
2. Opening Sample Programme
Here is the sample programme code of SEND_DATA_RETRIEVE_DATA_OLED.
// Include necessary libraries
#include <AntaresESPMQTT.h> // Include AntaresESP32HTTP library for Antares platform communication
#include <Adafruit_SSD1306.h> // Include Adafruit_SSD1306 library for OLED display
#include "DHT.h" // Include DHT library for temperature and humidity sensor
#define DHTPIN 14 // Define the pin connected to the DHT sensor
#define DHTTYPE DHT11 // Set the DHT sensor type as DHT11
#define ACCESSKEY "YOUR-ACCESS-KEY" // Replace with your Antares account access key
#define WIFISSID "YOUR-WIFI-SSID" // Replace with your Wi-Fi SSID
#define PASSWORD "YOUR-WIFI-PASSWORD" // Replace with your Wi-Fi password
#define projectName "YOUR-APPLICATION-NAME" // Replace with the Antares application name that was created
#define deviceNameSensor "YOUR-DEVICE-NAME-1" // Replace with the Antares device name that was created
#define deviceNameMQTT "YOUR-DEVICE-NAME-2" // Replace with your Antares device name, make sure all devices are in one application
AntaresESPMQTT antares(ACCESSKEY); // Create AntaresESP32HTTP object
DHT dht(DHTPIN, DHTTYPE); // Create DHT object for sensor readings
#define SCREEN_WIDTH 128 // Set OLED screen width
#define SCREEN_HEIGHT 64 // Set OLED screen height
#define OLED_RESET -1 // Define OLED reset pin, not used in this case
const unsigned long interval = 5000; // Interval for sending sensor data (5 seconds)
const unsigned long interval2 = 10000; // Interval for receiving Postman data (10 seconds)
unsigned long previousMillis = 0; // Store the last time sensor data was sent
unsigned long previousMillis2 = 0; // Store the last time Postman data was received
String testData; // Store received Postman data
String lastData = ""; // Store last received Postman data
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); // Create OLED display object
bool showSensorData = true; // Flag to control displaying sensor data
void callback(char topic[], byte payload[], unsigned int length) {
antares.get(topic, payload, length);
Serial.println("New Message!");
Serial.println("Topic: " + antares.getTopic());
Serial.println("Payload: " + antares.getPayload());
testData = antares.getString("Test");
Serial.println("Received: " + testData);
if (testData!="null")
{
if (lastData!=testData)
{
lastData=testData;
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
display.println("Received: " + testData);
display.display();
}
}
}
void setup() {
Serial.begin(115200); // Initialize serial communication
antares.setDebug(true); // Enable debugging for Antares
antares.wifiConnection(WIFISSID, PASSWORD);
antares.setMqttServer();
antares.setCallback(callback);
dht.begin(); // Initialize DHT sensor
if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Initialize OLED display
Serial.println(F("SSD1306 allocation failed"));
for (;;)
;
}
display.clearDisplay(); // Clear the display buffer
display.display(); // Display the cleared buffer
}
void loop() {
/*
Check if we're still connected to the MQTT broker/server.
If disconnected, the device will try to reconnect.
*/
antares.checkMqttConnection();
// Send sensor data
if (millis() - previousMillis > interval) {
previousMillis = millis();
float hum = dht.readHumidity(); // Read humidity from DHT sensor
float temp = dht.readTemperature(); // Read temperature from DHT sensor
if (isnan(hum) || isnan(temp)) { // Check if sensor reading is valid
Serial.println("Failed to read DHT sensor!");
return;
}
// Add temperature and humidity data to the storage buffer
antares.add("temperature", temp);
antares.add("humidity", hum);
// Send data from the storage buffer to Antares
antares.publish(projectName, deviceNameSensor);
// Display temperature and humidity on OLED
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
display.println("Temp: " + String(temp) + " *C");
display.println("Humidity: " + String(hum) + " %");
display.display();
}
// Receive and display latest data
if (millis() - previousMillis2 > interval2) {
previousMillis2 = millis();
antares.retrieveLastData(projectName,deviceNameMQTT);
}
}
3. Set WiFi Credential and Antares Credential in Program Code
Change the HTTP Protocol parameters in the following variables *ACCESSKEY, *WIFISSID, *PASSWORD, *projectName, and *deviceName. Adjust to the parameters in the Antares console.
#define ACCESSKEY "YOUR-ACCESS-KEY" // Replace with your Antares account access key
#define WIFISSID "YOUR-WIFI-SSID" // Replace with your Wi-Fi SSID
#define PASSWORD "YOUR-WIFI-PASSWORD" // Replace with your Wi-Fi password
#define projectName "YOUR-APPLICATION-NAME" // Antares project name
#define deviceNameSensor "YOUR-DEVICE-NAME-1" // Name of the device sending sensor data
#define deviceNamePostman "YOUR-DEVICE-NAME-2" // Name of the device receiving data




4. Compile and Upload Program
Connect the Lynx-32 with your computer and make sure the Communication Port is read.
Set up the ESP32 board by clicking Tools > Board > esp32 in the Arduino IDE, then make sure the ESP32 Dev Module is used. Select the port according to the communication port that is read (in this case COM4). The result will look like the following image.

After all the setup is complete, upload the programme by pressing the arrow icon as shown below. Wait for the compile and upload process to finish
If the programme upload is successful, it will look like the following image.
After uploading the programme, you can view the serial monitor to debug the programme. The serial monitor icon is shown in the following image.

Set the serial baud rate to 115200 and select BothNL & CR. The result will look like the following image.
Make sure the serial baud rate matches the value defined in the programme code. If the serial baud rate is not the same between the programme code and the serial monitor, the ASCII characters will not be read properly.
5. MQTTX Software Setup
Open the MQTTX App, then select New Connection

In order to configure MQTTX with Antares broker, adjust the Name, Host and Port as shown below, then click Connect.

If it is connected, there is a notification as shown below

Enter Topic and Payload in the fields in MQTTX.

Topic
/oneM2M/req/your-access-key/antares-cse/json
Payload
{
"m2m:rqp": {
"fr": "your-access-key",
"to": "/antares-cse/antares-id/nama-aplikasi-anda/nama-device-anda",
"op": 1,
"rqi": 123456,
"pc": {
"m2m:cin": {
"cnf": "message",
"con": "{\"your-first-data\":\"the-integer-value\",\"your-second-data\":\"the-string-data\"}"
}
},
"ty": 4
}
}
In the MQTTX software, enter the Topic and Payload that you want to use. Then click Publish to send the message from MQTTX to the Antares server.

6. Sending MQTTX Messages to Antares Server
After the MQTTX software setup is complete, it's time to send the PUBLISH command. The "Test" field is filled with the string "Hello Antares" as the message that will be sent via the MQTT protocol to the Antares server.
{
"m2m:rqp": {
"fr": "your-access-key",
"to": "/antares-cse/antares-id/nama-aplikasi-anda/nama-device-anda",
"op": 1,
"rqi": 123456,
"pc": {
"m2m:cin": {
"cnf": "message",
"con": "{\"Test\":\"Hallo Antares\"}"
}
},
"ty": 4
}
}
If you have finished filling in the "Test" field, then press the Publish button on the MQTTX software, as shown below.

Publish to send the message to the Antares server

7. Check Data in Antares
After uploading the programme successfully, then open the device antares page and see if the data has been successfully sent.


8. View Retrieve Message
Retrieve data from the Antares IoT Platform and display it on the OLED display after connecting to Wi-Fi as shown in the figure below:


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