#301 DHT11 Basics

Test basic temperature and humidity readings with the DHT11 sensor.

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:

Construction

Credits and References

• DHT11Lib - library on the arduino playground
• DHT11 Humidity & Temperature Sensor - D-Robotics UK
• DHTxx Sensors Guide - adafruit
• ..as mentioned on my blog