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DHT11 Pinout

DHT11 Pinout

 

 

Pin#

Type

                                            Parameters

Pin#1

Vcc

Provide 3.3V to 5V at this pin.

Pin#2

Data

This pin provides a digital output.

Pin#3

N/C

 Not Connected.

Pin#4

Ground

This pin is used for Ground ( Connected to 0V or GND ).

DHT11 Description

The DHT11 Temperature and Humidity Sensor has a temperature and humidity sensor complex with a calibrated digital signal output. It offers high dependability and outstanding long-term stability by employing an innovative digital-signal-acquisition technique as well as temperature and humidity sensing technologies. This sensor consists of a resistive-type humidity measurement component and an NTC temperature measurement component, and it links to a high-performance 8-bit microcontroller, providing great quality, fast response, anti-interference capability, and cost-effectiveness.

DHT11 Feature

  • Voltage range: 3.5V to 5.5V

  • 0.3mA (measuring) 60uA operating current (standby)

  • Serial data is output.

  • 0°C to 50°C temperature range

  • Humidity levels range from 20% to 90%.

  • Temperature and humidity are both 16-bit resolutions.

  • 1°C and 1 per cent accuracy

DHT11 Application

  • Measure temperature and humidity

  • Local Weather station

  • Automatic climate control

  • Environment monitoring

DHT11 Equivalent

The equivalent for DHT11

  • DHT22

  • AM2302

  • SHT71

Where Should DHT11 Be Used?

The DHT11 is a temperature and humidity sensor that is widely used. The sensor includes a dedicated NTC to detect temperature and an 8-bit microprocessor to output temperature and humidity measurements as serial data. The sensor is factory calibrated as well, making it simple to interface with other microcontrollers.

The sensor can measure temperature from 0°C to 50°C and humidity from 20% to 90% with an accuracy of 1°C and 1%, respectively. So, if you're wanting to measure in this range, this sensor would be a good fit.

 

How to Make Use of DHT11?

The DHT11 sensor is factory calibrated and delivers serial data, making it extremely simple to set up. This sensor's wiring diagram is shown below.

DHT11 Typical Application Circuit

As you can see, the data pin is connected to an MCU I/O pin via a 5K pull-up resistor. This data pin serially outputs the temperature and humidity values. If you want to connect a DHT11 to an Arduino, there are ready-made libraries that will help you get started quickly.

If you are attempting to interface it with another MCU, the datasheet provided below will be useful. The data pin will output 8-bit humidity integer data + 8-bit humidity decimal data +8 bit temperature integer data +8 bit fractional temperature data +8 bit parity bit. To request that the DHT11 module provide these data, the I/O pin must be briefly held low and then raised, as indicated in the timing diagram below.

Interfacing DHT11 with MCU

DHT11 Package

DHT11 Package

Frequently Asked Questions

FAQ

DHT11 vs. LM35?
DHT11 can measure both humidity and temperature while LM35 can only measure temperature. A very small amount of current is required to operate for LM35. While on other hand the range of measuring the temperature of LM35 is maximum than the DHT11. The DHT11 requires less voltage for its operation.
What difference is between DHT11 Sensor and Module?
The DHT11 sensor is available as a sensor or as a module. In either case, the sensor's performance is the same. The sensor will be packaged in a 4-pin package, with just three pins used, whereas the module will have three pins as illustrated above. The only difference between the sensor and the module is that the module includes a filtering capacitor and a pull-up resistor, whereas the sensor requires you to use them externally if necessary.
What is the accuracy of the DHT11 sensor?
1%.
What is the use of DHT sensor?
This sensor is used in various applications such as measuring humidity and temperature values in heating, ventilation and air conditioning systems. Weather stations also use these sensors to predict weather conditions. The humidity sensor is used as a preventive measure in homes where people are affected by humidity.
What does DHT11 ensure by using the digital-signal-acquisition technique and temperature & humidity sensing technology?
High reliability and excellent long-term stability.
What type of humidity measurement component does DHT11 have?
Resistive-type humidity measurement component and an NTC temperature measurement component.
DHT11 vs. DHT22?
Though the DHT22 is more precise, accurate, and works in a wider temperature and humidity range, there are three areas where the DHT11 outperforms the DHT22. It costs less, is smaller, and has a greater sample rate. The DHT11 has a sampling rate of 1Hz, which means one reading every second, but the DHT22 has a sampling rate of 0.5Hz, which means one reading every two seconds.
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