DHT11 Temperature-Humidity Sensor

DHT11 Temperature-Humidity Sensor Temperature-Humidity Sensor, DHT11 Onboard

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Primary Attribute Category: Modules, Sensors, Temperature/Humidity {{{userDefinedInfo}}}: {{{userdefinedvalue}}} Brand: Waveshare

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Onboard Interfaces I/Os

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Overview

This is a calibrated digital temperature and humidity module with an onboard sensor DHT11. It can be used for detecting ambient temperature and humidity, through the standard single-wire interface.

Specifications

• Sensor: DHT11
• Working Voltage: 3.3V-5.5V
• Temperature
  • Resolution: 1°C
  • Accuracy: ±2℃
  • Measuring range : 0°C ~ 50°C
• Humidity
  • Resolution: 1%RH
  • Accuracy : ±5%RH (0~50°C)
  • Measuring range : 20%RH ~ 90%RH (25°C)
• Operating voltage : 3.3V ~ 5.5 V
  • Recommended storage condition
  • Temperature : 10°C ~40°C
  • Humidity : 60%RH or below
• Fixed Hole Size: 2.0mm

Pinouts

Pin	Description
DOUT	Digital output
GND	Power ground
VCC	3.3V-5.5V

Use with Raspberry Pico

Hardware Connection

Sensor	Pico	Description
VCC	3.3V	Power input
GMD	GND	Power ground
DOUT	GP15	Digital data output

Download examples

Use Raspberry Pi as the host device. Open a terminal and run the following commands to download the example.

sudo apt-get install p7zip-full
cd ~
sudo wget  https://files.waveshare.com/upload/4/4a/Temperature-Humidity-Sensor-code.7z
7z x Temperature-Humidity-Sensor-code.7z -o./Temperature-Humidity-Sensor-code
cd ~/Temperature-Humidity-Sensor-code
cd Pico/c/build/

Examples

C codes

• Go into the c directory.

cd ~/Temperature-Humidity-Sensor-code/Pico/c/build

• Add the path of the SDK.

export PICO_SDK_PATH=../../pico-sdk

Note that if the path of your SDK is different, you need to modify the command and use the correct path to export.

• Generate Makefile and build.

cmake ..
make -j9

• After building, a uf2 file is generated.
• Press and hold the button of Pico, connect it to Raspberry Pi then release the button.
• Copy/Drag the uf2 file to the portable disk (RPI-RP2) recognized.

cp main.uf2 /media/pi/RPI-RP2/

Micropython codes

Use in Windows

• 1. Press and hold the BOOTSET button on the Pico board, connect the Pico to the USB port of the computer through the Micro USB cable, and release the button after the computer recognizes a removable hard disk (RPI-RP2).
  
• 2. Copy the Rp2-pico-20210418-v1.15 file in the python directory to the recognized removable disk (RPI-RP2).
  
• 3. Open Thonny IDE (Note: Use the latest version of Thonny, otherwise there is no Pico support package, the latest version under Windows is v3.3.3).
  
• 4. Click Tools -> Settings -> Interpreter, and select Pico and the corresponding port as shown in the figure.
  

• 5. File -> Open -> the corresponding .py file, click to run, as shown in the following figure:

Use in Raspberry Pi

• Flash the Micropython firmware first.
• Open the Thonny IDE (Menu -> Programming -> Thonny Python IDE).
• 【Optional】If the Thonny IDE in the Raspberry Pi is not the new version that supports Pico, please upgrade it first.

sudo apt upgrade thonny

• Configure Interpreter, choose Tools->Options... -> Interpreter, choose MicroPython(Raspberry Pi Pico) and the ttyACM0 port.

• Click File -> Open.. and browser the Micropython codes (Photo Interrupter Sensor.py) to run the codes.

Expected result

• The humidity and temperature data are printed to the serial port.

The STM32 examples are based on the STM32F103RBT6 and the STM32H743. The connection provided below is based on the STM32F103RB. If you need to use other STM32 boards, you may need to change the hardware connection and port the code yourself.

Use with STM32

Hardware connection

Sensor	STM32	Description
VCC	3.3V	Power input
GMD	GND	Power ground
DOUT	PA0	Digitial data output

Examples

The examples are developed based on the HAL libraries. Download the Demo codes archive to your PC. Unzip and find the STM32 project from Temperature-Humidity-Sensor-code\STM32\STM32F103RB\MDK-ARM.

• Open the DHT11 Sensor.uvprojx file by Keil
• Build and the project
• Program the project to your STM32 board.
• Connect the UART1 of your STM32 board to the PC and check the serial data with SSCOM software.

The Arduino example is written for the Arduino UNO. If you want to connect it to other Arduino boards, you may need to change the connection.

Use with Arduino

Hardware connection

Sensor	Arduino	Description
VCC	5V	Power input
GMD	GND	Power ground
DOUT	D2	Digital data output

Examples

• Download the demo codes to your PC and unzip.
• Install the Arduino IDE on your PC.
• Go into Temperature-Humidity-Sensor-code/Arduino/Temperature_Humidity_Sensor.
• Run the Temperature_Humidity_Sensor.ino file.
• Select the correct Board and the Port.

• Build the project and upload it to the board.
• Open the serial monitor of the Arduino IDE or the SSCOM software and check the serial data.

Resources

• Datasheets
• Schematic
• Demo Code
• Software

FAQ

Question:What other choices do I have?

 Answer:

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