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Project Notes

#301 DHT11/Basics

Test basic temperature and humidity readings with the DHT11 sensor.



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


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:






Credits and References

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