ESP32 Web Server

This project contains a Web Server for fetching the room temperature with a Temperature Sensor (BME280 Sensor Module).

Installation

• Install Arduino CLI

https://arduino.github.io/arduino-cli/1.2/installation/

Preparing the ESP32 Controller

You need:

• Mini D1 ESP32
• BME280 Sensor Module
• 4 wires
• USB Cable

Wiring:

• Place the controller on the edge of the breadboard
• Connect the wires as following: BME280 Sensor Module -> Mini D1 ESP32:
  • VCC -> 3.3V
  • GNC -> GNC
  • SCL -> IO22
  • SDA -> IO21
• Connect the controller to the computer

Setup

1. Open the Arduino CLI

2. Go to File > Preferences > Click on the Icon next to "Additional boards manager URLS:" > Enter the URL: https://espressif.github.io/arduino-esp32/package_esp32_index.json > Click "Ok" > Go to Tools > Boards Manager > Search for "esp32" and install it (not esp32 boards) Source: https://docs.espressif.com/projects/arduino-esp32/en/latest/installing.html#installing-using-boards-manager

3. Got to Tools > Boards > Boards Manager > Search for "Wemos D1 Mini Esp32" and select your USB Port (for me it was "COM3")

4. Go to Tools > Manage Libraries > Install these libraries:

• Adafruit BMP280
• Adafruit BusIO
• Adafruit Unified Sensor
• ArduinoJson

5. Create a secrets.h file like in secrets.h.example with your ssid and wifi password. And also in temperatues.ino set the ssid to your routers ssid.

6. Create a temperature.ino file and paste the contents of the current temperature.ino file (on Gitlab) in this file

7. If your client runs on WSL/Virtual Machine in Ubuntu:

   • The name resolution via dns doesnt work there, you have to either give the ip address or install a mdns responder with these libraries to enable dns-resolution from host:

   sudo apt update
   sudo apt install avahi-daemon libnss-mdns
   # restart Wsl or reload /etc/nsswitch.conf
   # /etc/nsswitch.conf should have this line:
   # hosts: files mdns4_minimal [NOTFOUND=return] dns
   
   

Run the web server

Server

1. Upload the code
2. Go to http://roomtemperature.local/temperature. You should see a json of the current room temperature like this: {"temperature":25.49}