Example Code for Arduino-WIFI to obtain temperature and humidity

Hardware Preparation

• DFR0868 Beetle ESP32-C3 x 1
• SEN0330 FermionSHT30 temperature and humidity sensor x1 (or other SHT temperature and humidity sensor using the same SHT3x code base)
• Jumper Wires

Software Preparation

• Download Arduino IDE: Click to download Arduino IDE
• Add ESP32 board to Arduino IDE
• Download the DFRobot_SHT3X library: DFRobot_SHT3X library
• About how to install the library?

Wiring diagram

Steps

1. Connect to WIFI "Beetle ESP32 C3", WIFI password has been set: 12345678
2. Visit the website http://192.168.4.1/GET to get the temperature and humidity information in the LAN
3. In the temperature and humidity display page, you can update the sensor data by refreshing

Sample Code

/*
In this example, SHT30 is connected to ESPC3 to obtain temperature and humidity through LAN
*/

#include <WiFi.h>
#include <WiFiClient.h>
#include <WiFiAP.h>
#include <DFRobot_SHT3x.h>
//When ADR is connected to VDD, 0x45 can be selected; when ADR is connected to GND, 0x44 can be selected
//The default is 0x45, RST (reset pin) does not need to be connected
DFRobot_SHT3x sht3x(&Wire,/*address=*/0x45,/*RST=*/4);

//To use SPI, you need to comment the above code and use the following code
//DFRobot_SHT3x   sht3x;

// Set WIFI name and password
const char *ssid = "Beetle ESP32 C3";//WIFI name
const char *password = "12345678";//password

WiFiServer server(80);//The default web service port is 80

// Display the last sensor status feedback status

void setup() {
  //pinMode(myLED, OUTPUT);

  Serial.begin(115200);
  Serial.println();
  Serial.println("Configuring access point...");

  //If you want to open the network without a password, please delete the password
  WiFi.softAP(ssid, password);
  IPAddress myIP = WiFi.softAPIP();
  Serial.print("AP IP address: ");
  Serial.println(myIP);
  server.begin();

  Serial.println("Server started");
  //Initialize the sensor
  while (sht3x.begin() != 0) {
        Serial.println("Failed to Initialize the chip, please confirm the wire connection");
        delay(1000);
      }
      Serial.print("Chip serial number");
      Serial.println(sht3x.readSerialNumber());
      if(!sht3x.softReset()){
         Serial.println("Failed to Initialize the chip....");
       }
}

void loop() {

WiFiClient client = server.available();   // detect waiting for connection

  if (client) {                             // check if connected
    Serial.println("New Client."); 
    String currentLine = "";                // create String variable to hold the data
    while (client.connected()) {            // keep looping while keeping the connection
      if (client.available()) {             // check if the connection has data
        char c = client.read();             // read received data
        //Serial.write(c);                    // print on serial monitor
        if (c == '\n') {                    // if newline is read

          //Clear the cached content
          if (currentLine.length() == 0) {
            client.print(" ");
            break;
          } else {    // Clear variable cached data if there is a newline
            currentLine = "";
          }
        } else if (c != '\r') {  // If you get characters other than carriage return
          currentLine += c;      // The obtained character is added to the end of the variable
        }

        // Check if /GET is at the end
        if (currentLine.endsWith("/GET")) {
             //Read temperature and humidity
             float   temp = sht3x.getTemperatureC();
             float   humi = sht3x.getHumidityRH();  
             //Print on web page 
             client.print("temp (C): "); client.println(temp);
             client.print("humi (%RH): "); client.println(humi);
        }
      }
    }
    // Disconnect
    client.stop();
    Serial.println("Client Disconnected.");
  }
  }

Result

You can access the website through a mobile phone, computer, etc. to obtain the following results (temperature and humidity under the LAN).

Member function

• WiFi.softAP(ssid, password)
  
  Description: Similar to opening the hotspot with the set WIFI account password
  
  Parameter:

• ssid: WIFI name

• password: WIFI password

• WiFi.softAPIP()
  
  Description: WIFI IP address