How DHT11 Humidity Sensor Works ? | 3D Animated 🔥

Summary

This video explains the DHT11 sensor, a common device for measuring temperature and humidity with Arduino. It covers the sensor's specifications, internal components, and how it measures environmental conditions. The video also details the pinout and provides a wiring diagram for connecting the DHT11 to an Arduino.

Highlights

Internal Components of DHT1100:00:58

Inside the DHT11, you'll find an 8-bit microcontroller for data processing. On the PCB, there's an NTC thermistor and a humidity-sensing component.

How Humidity Sensing Works00:01:15

The humidity sensing component has two electrodes with a moisture-holding substrate. As humidity increases, the substrate absorbs water, releasing ions and decreasing resistance between the electrodes. This resistance change is proportional to humidity.

Introduction to DHT11 Sensor00:00:00

This video will demonstrate how the DHT11 sensor works with Arduino to measure temperature and humidity.

How Temperature Sensing Works00:01:39

The DHT11 uses an NTC thermistor for temperature measurement. An NTC thermistor's resistance decreases as temperature rises, which is how it measures temperature.

DHT11 Pinout and Wiring00:02:01

The DHT11 has a VCC pin for power (3.3V to 5.5V), an Out pin for communication with the microcontroller, and a GND pin for ground. The video provides a diagram for wiring the DHT11 module to an Arduino.

DHT11 Specifications00:00:19

The DHT11 measures temperature from 0°C to 50°C with ±2°C accuracy and humidity from 20% to 80% with 5% accuracy. It has a sampling rate of 1 Hz, providing new data every second. It typically requires a 10k pull-up resistor on the output pin and includes a decoupling capacitor.