ESP32 Table Clock with Temperature and Humidity

Components used

• ESP32
• AHT25 (or any other AHTxx sensor)
• DS1302 RTC + 3V CR2032 battery
• SD1306 OLED display (128x64)
• 1x 1kΩ resistor (in AHT25 ground)

if your ESP32 devkit doesn't have internal pull-ups, you will need to add external pull-ups for the I2C lines (SDA and SCL).

• 2x 10kΩ resistors (for AHT25 I2C pull-ups)

Web server routes

• GET / - Displays the HTML form for setting WiFi.
• POST /save - Saves the WiFi credentials from the form and try connecting.
• GET /status - Returns the current temperature and humidity in JSON format.