Connect a temperature and humidity sensor to a Raspberry Pi

Temperature and humidity sensors are a preferred selection for Raspberry Pi tasks, as they’re comparatively cheap and simple to make use of. These sensors can be utilized to observe the surroundings in your house, backyard, or greenhouse, or to create your individual climate station.

Selecting a temperature and humidity sensor

There are a selection of various temperature and humidity sensors obtainable, so you will need to select one that’s appropriate in your wants. Some elements to contemplate embody:

• Accuracy: How correct does the sensor must be? If you’re utilizing the sensor for scientific analysis, you will have a extra correct sensor than in case you are utilizing it to observe the temperature and humidity in your house.
• Vary: What temperature and humidity vary does the sensor have to cowl? If you happen to stay in a chilly local weather, you will have a sensor that may measure very low temperatures. If you happen to stay in a damp local weather, you will have a sensor that may measure very excessive humidity ranges.
• Price: Temperature and humidity sensors can vary in value from just a few {dollars} to over $100. Select a sensor that matches your finances and your wants.

Two fashionable temperature and humidity sensor for Raspberry Pi tasks are the DHT11 and DHT22. Each sensors are correct and inexpensive, however the DHT22 is extra correct than the DHT11.

Connecting the temperature and humidity sensor to the Raspberry Pi

After you have chosen a temperature and humidity sensor, you want to join it to your Raspberry Pi. This can be a comparatively easy course of.

DHT11

The DHT11 sensor has three pins:

• VCC: Join this pin to the 5V pin on the Raspberry Pi.
• GND: Join this pin to the bottom pin on the Raspberry Pi.
• DATA: Join this pin to GPIO pin 4 on the Raspberry Pi.

DHT22

The DHT22 sensor has 4 pins:

• VCC: Join this pin to the 5V pin on the Raspberry Pi.
• GND: Join this pin to the bottom pin on the Raspberry Pi.
• DATA: Join this pin to GPIO pin 4 on the Raspberry Pi.
• NC: This pin is just not linked.

Putting in the DHT library

To learn temperature and humidity information from the DHT11 or DHT22 sensor, you want to set up the DHT library. You are able to do this utilizing the next command:

sudo pip3 set up Adafruit_DHT

As soon as the library is put in, you can begin studying temperature and humidity information from the sensor

Utilizing the temperature and humidity sensor in a challenge

Temperature and humidity sensors can be utilized in quite a lot of tasks. For instance, you need to use a temperature and humidity sensor to:

• Monitor the temperature and humidity in your house, greenhouse, or backyard.
• Create your individual climate station.
• Construct a wise thermostat that robotically adjusts the temperature of your own home.
• Construct a system that robotically controls the irrigation system in your backyard.
• Construct a system that displays the temperature and humidity in a server room or information heart.

The probabilities are infinite!

Conclusion

Connecting a temperature and humidity sensor to a Raspberry Pi is a comparatively easy course of. As soon as the sensor is linked, you need to use the DHT library to learn temperature and humidity information. This information can then be utilized in quite a lot of tasks, comparable to monitoring the surroundings, making a climate station, or constructing a wise thermostat.