Arduino temperature and humidity measuring device

A simple Arduino-based device that measures temperature and humidity using a DHT11 sensor and displays the data on a Nokia 5110 or 16x2 LCD, as well as in the Serial Monitor.

Features

• Measures temperature and humidity using a DHT11 sensor
• Displays data on a Nokia 5110 or 16x2 LCD, and in the Serial Monitor
• Adjustable contrast when using the 16x2 LCD (set via the Contrast variable)

Components used

• Arduino Uno
• DHT 11 Humidity & Temperature Sensor Module
• Nokia 5110 LCD or 16x2 LCD Module
• Wires

Nokia 5110 LCD

Schematic

Device

16x2 LCD

Schematic

Device

How to use

1. Install required libraries (Adafruit Unified Sensor, DHT sensor library).
2. Connect your hardware components as shown in the schematic.
3. Upload the code to your microcontroller:
   • If you use Arduino IDE, open the appropriate .ino file for your LCD type (temp_hum_device_16x2_lcd.ino or temp_hum_device_nokia_5110_lcd.ino) and upload it directly.
   • If you use VS Code with PlatformIO or another editor, use the single main code file (main.cpp), which contains code for both LCD types. By default, the Nokia 5110 code is commented out. Uncomment the section for your LCD and comment out the other before uploading.
4. Watch the temperature and humidity data update on the screen and in the Serial Monitor.