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1. #ZER TEMP MONITOR CELLULAR INSTALL#
2. #ZER TEMP MONITOR CELLULAR SOFTWARE#
3. #ZER TEMP MONITOR CELLULAR CODE#

I've installed them into some small project boxes, hot-glued the sensors to the outside, and set them up in my living room, office, and bedroom. I have three of these DHT22 sensors and three Raspberry Pi Zero Ws connected to my WiFi. Oof! Hot and humid in here! (Chris Collins, CC BY-SA 4.0) # Using the Raspberry Pi GPIO Pin 4, "SENSOR_PIN"įinally, run the script! You should end up with something like this:Ĩ4 degrees and 50% humidity. The important bits here are initializing the sensor and setting the correct GPIO pin to use on the Raspberry Pi: # Initialize the DHT22 sensorĪnother important bit is reading the data from the sensor with the variables set above for the sensor and pin: # This connects to the sensor "SENSOR" Print("Temp: %".format(temperature, humidity)) Print("GPIO Access may need sudo permissions.") # Other RuntimeError exceptions may occur, but # GPIO access may require sudo permissions Humidity, temperature = Adafruit_DHT.read_retry(SENSOR, SENSOR_PIN) Parser.add_argument("-f", "-fahrenheit", help="output temperature in Fahrenheit", action="")ĭef celsius_to_fahrenheit(degrees_celsius):

#ZER TEMP MONITOR CELLULAR SOFTWARE#

# This imports the Adafruit DHT software installed via pip With the DHT libraries installed, you can connect to the sensor and retrieve temperature and humidity data.Ĭreate a file with: #!/usr/bin/env python3

#ZER TEMP MONITOR CELLULAR INSTALL#

Sudo pip3 install Adafruit_DHT Get sensor data with Python # Install the Adafruit DHT sensor library Once you've installed the operating system on an SD card and booted the Raspberry Pi from the card, there are only a couple of other software packages to install to interact with the DHT22.įirst, install the Python Preferred Installer Program (pip) with apt-get, and then use pip to install the Adafruit DHT sensor library for Python to interact with the DHT22 sensor. I am using Raspberry Pi OS Lite, released May 7, 2021, as the image for the Raspberry Pi Zero W. If not, consult my article about customizing different operating system images for Raspberry Pi. (Copyright © 2021 Matt Hawkins) Install the DHT sensor softwareīefore proceeding, make sure you have an operating system installed on the Raspberry Pi Zero W and can connect to it remotely or with a keyboard.

This diagram from Raspberry Pi Spy shows the pin layout for the Raspberry Pi Zero W (among others). DHT22 Ground pin Raspberry Pi Group pin (#6).DHT22 Data pin Raspberry Pi GPIO4 pin (#7).DHT22 Positive pin Raspberry Pi GPIO v5 pin (#2).Finally, I connected the Ground pin on the DHT22 to a ground pin on the Raspberry Pi header.

#ZER TEMP MONITOR CELLULAR CODE#

I am using GPIO4 for this, but any would work just make a note of the one you choose, as the Python code that reads the data from the sensor will need to know which pin to read from. I connected the Data pin on the DHT22 to one of the Raspberry Pi GPIO pins. The DHT22 runs on 3v-6v, so I selected one of the 5v pins on the Raspberry Pi to provide the power. The Positive pin provides power from the Pi to the DHT22. I used Raspberry Pi Spy's Raspberry Pi GPIO guide to make sure I connected everything correctly. You can wire the DHT22 directly to the Raspberry Pi Zero W. The DHT22 with the PCB attached has three pins: a Positive pin (marked with +), a Data pin, and a Ground pin (marked with -). If you purchase a raw sensor, you'll need a resistor and some soldering skills to get it working (check out Pi My Life Up's DHT22 article for great instructions on working with the raw sensor), but you can also purchase one with a small PCB that includes all that, which is what I did.

The DHT22 is a digital sensor, making it easy to interact with.

You can find a bunch of inexpensive DHT22 temperature and humidity sensors with a quick web search.