Published May 22, 2024 © GPL3+

Creating a Wi-Fi Enabled Weather Station with ESP32-PICO-D4

In this project, we will guide you through building a Wi-Fi enabled weather station using the ESP32-PICO-D4.

BeginnerProtip1.5 hours309

Creating a Wi-Fi Enabled Weather Station with ESP32-PICO-D4

Things used in this project

Hardware components

Espressif ESP32-PICO-D4 Module

xecor.com provide high-quality esp32-pico-d4

SparkFun Atmospheric Sensor Breakout - BME280

ElectroPeak 0.96" OLED 64x128 Display Module

Jumper wires (generic)

SparkFun Breadboard Power Supply 5V/3.3V

Story

Circuit Design:

1. Connect BME280 Sensor to ESP32-PICO-D4:

Connect the VCC pin of the BME280 to the 3.3V pin of the ESP32-PICO-D4.
Connect the GND pin of the BME280 to the GND pin of the ESP32-PICO-D4.
Connect the SCL pin of the BME280 to the GPIO22 (SCL) pin of the ESP32-PICO-D4.
Connect the SDA pin of the BME280 to the GPIO21 (SDA) pin of the ESP32-PICO-D4.

2. Connect OLED Display to ESP32-PICO-D4 (optional):

Connect the VCC pin of the OLED display to the 3.3V pin of the ESP32-PICO-D4.
Connect the GND pin of the OLED display to the GND pin of the ESP32-PICO-D4.
Connect the SCL pin of the OLED display to the GPIO22 (SCL) pin of the ESP32-PICO-D4.
Connect the SDA pin of the OLED display to the GPIO21 (SDA) pin of the ESP32-PICO-D4.

3. Power Supply:

Ensure the ESP32-PICO-D4 and other components are properly powered with a 5V power supply.

4. Programming:

Write a program for the ESP32-PICO-D4 to read data from the BME280 sensor and serve this data on a web server. You can use the Arduino IDE for this purpose.

Example Code:

#include <Wire.h>

#include <Adafruit_Sensor.h>

#include <Adafruit_BME280.h>

#include <WiFi.h>

#include <WebServer.h>

// Replace with your network credentials

const char* ssid = "Your_SSID";

const char* password = "Your_PASSWORD";

// Create an instance of the BME280 sensor

Adafruit_BME280 bme;

// Create a web server object that listens for HTTP request on port 80

WebServer server(80);

void setup() {

Serial.begin(115200);

WiFi.begin(ssid, password);

// Wait for connection

while (WiFi.status() != WL_CONNECTED) {

delay(500);

Serial.print(".");

}

Serial.println("WiFi connected");

// Start the sensor

if (!bme.begin(0x76)) {

Serial.println("Could not find a valid BME280 sensor, check wiring!");

while (1);

}

// Define the web server routes

server.on("/", handleRoot);

server.begin();

Serial.println("HTTP server started");

}

void loop() {

server.handleClient();

}

void handleRoot() {

float temperature = bme.readTemperature();

float humidity = bme.readHumidity();

float pressure = bme.readPressure() / 100.0F;

String html = "<!DOCTYPE html><html><head><title>Weather Station</title></head><body>";

html += "<h1>Weather Station</h1>";

html += "<p>Temperature: " + String(temperature) + " °C</p>";

html += "<p>Humidity: " + String(humidity) + " %</p>";

html += "<p>Pressure: " + String(pressure) + " hPa</p>";

html += "</body></html>";

server.send(200, "text/html", html);

}

Testing:

Upload the program to the ESP32-PICO-D4 and power up the circuit. Connect your computer or smartphone to the same Wi-Fi network as the ESP32-PICO-D4. Open a web browser and enter the IP address assigned to the ESP32-PICO-D4 (you can find this in the Serial Monitor). The web page should display the current temperature, humidity, and pressure readings.

Conclusion:

Creating a Wi-Fi enabled weather station with the ESP32-PICO-D4 showcases the module's capabilities in IoT applications. This project can be further enhanced with additional sensors, data logging to a cloud service, or integration with smart home systems. The ESP32-PICO-D4's versatility and connectivity make it an ideal choice for various IoT projects.