How to Use the DHT22 Library in MicroPython?

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To use the DHT22 library in MicroPython, you can follow these steps:

  1. Connect the DHT22 sensor to your MicroPython board. The DHT22 has three pins: VCC, GND, and data. Connect VCC to a 3.3V pin on your board, GND to a GND pin, and data to any available GPIO pin.
  2. Install the DHT22 library on your board. You can download the library from the MicroPython library repository and transfer it to your board using a tool like ampy or WebREPL.
  3. Write a MicroPython program to read temperature and humidity from the DHT22 sensor. Here’s an example program:
import dht
from machine import Pin

# Connect the DHT22 sensor to GPIO4
dht_pin = Pin(4)

# Create a DHT22 object using the data pin
dht22 = dht.DHT22(dht_pin)

# Read temperature and humidity from the sensor
dht22.measure()
temp = dht22.temperature()
hum = dht22.humidity()

# Print the results
print("Temperature: {} degrees C".format(temp))
print("Humidity: {}%".format(hum))

In this program, we first import the dht module, which provides support for the DHT22 sensor, and the machine module, which provides access to the board’s GPIO pins.

We then create a DHT22 object using the data pin connected to the sensor.

Next, we use the measure() method to initiate a measurement on the sensor, and the temperature() and humidity() methods to retrieve the temperature and humidity values, respectively.

Finally, we print the temperature and humidity values to the console.

  1. Save the MicroPython program to your board’s file system using a tool like ampy or WebREPL.
  2. Run the MicroPython program on your board by executing the following command in the REPL:
import main

Replace main with the name of your MicroPython program file. The board should now read temperature and humidity from the DHT22 sensor and print the values to the console.

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