In this project, you will use the Antares Shield Workshop on the ESP8266 module. In this Antares Shield Workshop, there are temperature, humidity (DHT11), relay, LED and push button sensors. You will monitor the temperature and humidity according to the specified interval period. The results of the data sent by the sensor can be monitored through the Antares console.
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.
You can open the programme code in the Arduino IDE via File > Example > Antares ESP MQTT > ESP8266-Simple-Project > POST_DATA_DHT11_PUSHBUTTON.
Below is the programme code of the POST_DATA_DHT11_PUSHBUTTON example.
// Include necessary libraries#include<AntaresESPMQTT.h>// Library initiation for Antares ESP8266 MQTT#include"DHT.h"// Include the DHT sensor library#defineDHTPIN D1 // Define the pin number for the DHT sensor (connected to pin 14)#defineDHTTYPE DHT11 // Define the DHT sensor type as DHT11#definepushButtonPin A0; // Define the pin number for the push button (connected to pin A0)#defineledPin D2; // Define the pin number for the LED (connected to pin D2)#defineACCESSKEY"YOUR-ACCESS-KEY" // Replace with your Antares account access key#defineWIFISSID"YOUR-WIFI-SSID" // Replace with your Wi-Fi SSID#definePASSWORD"YOUR-WIFI-PASSWORD" // Replace with your Wi-Fi password#defineprojectName"YOUR-APPLICATION-NAME" // Replace with the Antares application name that was created#definedeviceName"YOUR-DEVICE-NAME" // Replace with the Antares device name that was createdAntaresESPMQTTantares(ACCESSKEY); // Create an object for interacting with AntaresDHTdht(DHTPIN,DHTTYPE); // Create a DHT object for the DHT sensorbool ledState =false; // Variable to store the state of the LED (ON or OFF)bool lastButtonState =false; // Variable to store the previous state of the push buttonvoidsetup() {Serial.begin(115200); // Initialize serial communication with baudrate 115200antares.setDebug(true); // Enable debug mode for AntaresESP32MQTT (messages will be displayed in the serial monitor)antares.wifiConnection(WIFISSID, PASSWORD); // Connect to Wi-Fi with the specified SSID and passwordantares.setMqttServer();dht.begin(); // Initialize the DHT sensorpinMode(pushButtonPin, INPUT); // Set the push button pin as input with internal pull-up resistorpinMode(ledPin, OUTPUT); // Set the LED pin as outputdigitalWrite(ledPin, LOW); // Turn off the LED initially}voidloop() {antares.checkMqttConnection(); // Read the current state of the push buttonint analogValue =analogRead(A0);bool currentButtonState = (analogValue <512); // Adjust the threshold as needed // Check if the button state has changed (button press detected)if (currentButtonState != lastButtonState && currentButtonState == LOW) {Serial.println("The button is pressed"); // Toggle state of the LED (ON to OFF or OFF to ON) ledState =!ledState;digitalWrite(ledPin, ledState); // Read temperature and humidity from the DHT sensorfloat hum =dht.readHumidity();float temp =dht.readTemperature(); // Check if the sensor reading is validif (isnan(hum) ||isnan(temp)) {Serial.println("Failed to read DHT sensor!");return; } // Print temperature and humidity values to the serial monitorSerial.println("Temperature: "+ (String)temp +" *C");Serial.println("Humidity: "+ (String)hum +" %"); // Add temperature and humidity data to the Antares storage bufferantares.add("temperature", temp);antares.add("humidity", hum); // Send the data from the storage buffer to Antaresantares.publish(projectName, deviceName); // Add some delay to avoid multiple data sending due to button debouncingdelay(1000); } // Update the last button state for the next iteration lastButtonState = currentButtonState;}
3. Set Wi-Fi 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.
#defineACCESSKEY"YOUR-ACCESS-KEY" // Replace with your Antares account access key#defineWIFISSID"YOUR-WIFI-SSID" // Replace with your Wi-Fi SSID#definePASSWORD"YOUR-WIFI-PASSWORD" // Replace with your Wi-Fi password#defineprojectName"YOUR-APPLICATION-NAME" // Replace with the Antares application name that was created#definedeviceName"YOUR-DEVICE-NAME" // Replace with the Antares device name that was created
The *Access key parameter is obtained from your Antares account page.
The WIFISSID parameter is obtained from the name of the Wifi / Hotspot that is currently being used by you. for example in the image below.
The *PASSWORD parameter is obtained from the WiFi password you are currently using.
The parameters *projectName and *deviceName are obtained from the Application Name and Device Name that have been created in the Antares account.
4. Compile and Upload Program
Connect the ESP8266 WEMOS D1R2 with your computer and make sure the Communication Port is read.
On Windows operating systems, checking can be done via Device Manager. If your ESP8266 WEMOS D1R2 is read, the USB-Serial CH340 appears with the port adjusting the port availability (in this case it reads COM4).
Set up the ESP8266 WEMOS D1R2 board by clicking Tools > Board > esp8266 in the Arduino IDE, then make sure the one used is LOLIN (WEMOS) D1 R2 & mini. Select the port according to the communication port that is read (in this case COM4). The result will look like the following picture.
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.
The Tick icon on the Arduino IDE is just the verify process. Usually used to compile the programme to find out whether there are errors or not.
The Arrow icon on the Arduino IDE is the verify and upload process. Usually used to Compile the programme as well as Flash the programme to the target board.
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.
Image of the Serial Monitor Icon in the Arduino IDE.
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. Check Data in Antares
After uploading the programme successfully, then open the device antares page and see if the data has been successfully sent.
Data sent from ESP8266 with HTTP protocol in the form of temperature and humidity variables.
Access Key Location on Antares Account Page
Application Name Display
Device Name Display
Console Page Image When Data Successfully Received
Picture of WEMOSD1R2 Attached to Antares Shield
The WiFi SSID being used.
Device Manager image on Windows.
Image of Tools Menu on Arduino IDE
Image of the Verify and Upload icons in the Arduino IDE.
