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dht11-lcd-thermometer-en.md

Environmental Dashboard: The DHT11 & LCD

The DHT11 & LCD project is the quintessential "next step" after learning to blink an LED. It combines data acquisition from a digital sensor with data visualization on a character display, resulting in a standalone, finished product.

stock_counter_lcd_setup_1772706693516.png

The Single-Wire Protocol

Unlike analog sensors (LM35) that just send a voltage, the DHT11 is a digital sensor. It uses a proprietary 1-wire communication protocol.

  • The Arduino sends a "start" signal to the sensor.
  • The sensor responds by sending exactly 40 bits of data (pulses of 5V).
  • These 40 bits contain the humidity integer, temperature integer, and a "checksum" to ensure the data wasn't corrupted in transit. (Thankfully, the DHT.h library handles all this binary math for you!).

Hardware Checklist

  • Arduino Uno/Nano: The main processor.
  • DHT11 Sensor: The climate monitor. (Can upgrade to DHT22 for higher accuracy).
  • 16x2 Text LCD (with I2C Backpack): Using an I2C module is highly recommended to save wiring (requires only 4 pins instead of 12).
  • Jumper Wires.

Screen Formatting

This project will teach you how to use the lcd.setCursor(column, row) function to perfectly format your data. You'll learn how to clear old characters and print the temperature on the top line and humidity on the bottom, making it a polished dashboard.

ข้อมูล Frontmatter ดั้งเดิม 

title: "DHT11 Humidity & Temperature with LCD"
description: "Your digital thermometer! Connect a DHT11 environmental sensor to an Arduino and display the room's climate data on a crisp 16x2 LCD."
category: "Sensors & Environment"
difficulty: "Easy"