Temperature & Humidity Monitor – DIY
A DIY Temperature & Humidity Monitor is a simple electronics project that measures the temperature and moisture level in the surrounding air. An ESP32 or Arduino can be connected to a DHT11 or DHT22 sensor to collect environmental readings. The measured values can then be displayed on a small LCD/OLED screen or sent wirelessly to a smartphone or web dashboard.
The main components include an ESP32 development board, DHT11/DHT22 temperature and humidity sensor, OLED/LCD display, jumper wires, and a breadboard. The sensor provides digital temperature and relative-humidity data to the microcontroller through a single data connection. The ESP32 processes these readings and updates the display at regular intervals.
This project is useful for learning sensor interfacing, microcontroller programming, and environmental monitoring. It can be expanded by adding Wi-Fi connectivity, allowing the ESP32 to upload readings to a web page or cloud dashboard. You can also add temperature or humidity alerts, data logging, and graphs to turn the basic monitor into a more advanced IoT project.