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Project Notes

#301 DHT11/Basics

Test basic temperature and humidity readings with the DHT11 sensor.

Build

Notes

The DHT11 sensor is a very cheap and common sensor that provides readings of:

  • relative humidity: 20-80% ±5%
  • temperature: 0-50°C ±2°C

Communications

The DHT11 uses a single-wire two-way communications protocol.

For a first test, I’m using a simple DHT11 library from the arduino playground. Adafruit have support for the DHT11 within their sensor framework; I’ll try that another time.

Test Output

The Basic.ino sketch simply outputs current readings to the console:

console-output

Construction

Breadboard

Schematic

Build

Credits and References

About LEAP#301 SensorsArduino
Project Source on GitHub Return to the LEAP Catalog

This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is my personal collection of electronics projects, usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting (IMHO!).

The projects are usually inspired by things found wild on the net, or ideas from the sources such as:

Feel free to borrow liberally, and if you spot any issues do let me know. See the individual projects for credits where due. There are even now a few projects contributed by others - send your own over in a pull request if you would also like to add to this collection.