Raspberry Pi Pico W

DHT11 Temperature and Humidity Sensor with Raspberry Pi Pico W

Introduction

Exploring DHT11 Temperature and Humidity Sensor with Raspberry Pi Pico W- The Raspberry Pi Pico W is a powerful microcontroller board that offers a wide range of possibilities for DIY projects. One of the many sensors that can be integrated with the Pico W is the DHT11 temperature and humidity sensor. In this article, we will explore how to connect and read data from the DHT11 sensor using the Raspberry Pi Pico W.




Connecting the DHT11 Sensor to Raspberry Pi Pico W:

To connect the DHT11 sensor to the Raspberry Pi Pico W, you will need a few components:

Raspberry Pi Pico W

DHT11 sensor module

Male-to-female jumper wires

Breadboard

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What is the DHT11 Sensor?

DHT11 Temperature and Humidity Sensor with Raspberry Pi Pico W

The DHT11 is a low-cost digital temperature and humidity sensor that uses a capacitive humidity sensor and a thermistor to measure the surrounding air conditions. It provides reliable readings with a temperature range of 0°C to 50°C and a humidity range of 20% to 90%.

Humidity Measuring

Humidity Range: 20-80% RH (Relative Humidity).

Humidity Accuracy: ±5% RH.

Humidity Resolution: 1% RH.

Temperature Measuring

Temperature Range: 0-50°C.

Temperature Accuracy: ±2°C.

Temperature Resolution: 1°C.

Other Specifications

Operating Voltage: 3 to 5.5 Volts.

Output: Digital signal.

Sampling Rate: Measurement can be taken every second.

Long-term Stability: <±1% RH/year.

Size and Dimensions: Small, easy to integrate into systems and devices.

Ease of Use: Simple digital control and output, straightforward interfacing with microcontrollers like Arduino and Raspberry Pi.

Power Consumption: Low, suitable for battery-operated applications.

Response Time: Humidity – 5s, Temperature – 1s.



DHT11 Temperature and Humidity Sensor with Pi Pico W:

DHT11 Temperature and Humidity Sensor with Raspberry Pi Pico W

Connect the VCC pin of the DHT11 sensor to the 3.3V pin on the Raspberry Pi Pico W.

Connect the GND pin of the DHT11 sensor to the GND pin on the Raspberry Pi Pico W.

Connect the DATA pin of the DHT11 sensor to any GPIO pin on the Raspberry Pi Pico W. In this example, we will use GPIO pin 16.

Once the connections are made, you are ready to write the code to read data from the DHT11 sensor.

dht library:

Ensure that the dht library is installed on your Raspberry Pi Pico W. To do this, simply create a new file in your IDE, paste the following dht library code into it, and save the file with the name ‘dht.py‘.



Reading Data from the DHT11 Sensor Program:

The code snippet above initializes the DHT11 sensor on GPIO pin 16 and continuously reads and prints the temperature and humidity values. If there is an error reading the data, it will display an error message.




Interpreting the Data

Once you run the code, you will see the temperature and humidity values printed in the console. The temperature will be displayed in Celsius, and the humidity will be displayed as a percentage.

DHT11 Temperature and Humidity Sensor with Raspberry Pi Pico W

applying some heat

DHT11 Temperature and Humidity Sensor with Raspberry Pi Pico W

It is important to note that the DHT11 sensor has a limited accuracy and response time compared to more advanced sensors. Therefore, it is recommended to use it for general temperature and humidity monitoring rather than critical applications.



Conclusion

The DHT11 sensor is a cost-effective solution for measuring temperature and humidity with the Raspberry Pi Pico W. By following the steps outlined in this article, you can easily connect and read data from the DHT11 sensor. Whether you are building a weather station or monitoring the conditions in a greenhouse, the combination of the Raspberry Pi Pico W and DHT11 sensor offers a versatile and affordable solution.

Remember to experiment with different GPIO pins and explore additional functionalities of the DHT11 sensor to expand your project possibilities.

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