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$ sudo pip3 install ISStreamer Python Script Install the ISStreamer module at a command prompt ( info on this module):.This module will make sending data to your dashboard super easy. You can follow the detailed instructions here for registering for an account and installing the Initial State Python streaming module. We will use Initial State for this step of the project (free for students, $99/yr for every one else). Next, you need a destination for your sensor data so you can turn that data into an awesome dashboard or an SMS/email alert. You have everything you need to communicate with your sensor. $ pip3 install adafruit-circuitpython-dht $ sudo apt-get install libgpiod2 Install the Adafruit CircuitPython-DHT library at a command prompt to make reading DHT22 sensor data super easy ( info on this module):.Connect your Pi Zero WH to your WiFi network.You can follow the instructions at to setup your Pi Zero WH. You need to install the standard Raspbian operating system so your Pi Zero WH will boot.Adafruit has deprecated their DHT Python library and now uses the CircuitPython-DHT library. We want to keep each node as small and compact as possible.įor this project you’ll need to use Python 3. Once it is setup, you won’t need either a monitor or a keyboard to run when deployed in your space. You will need a monitor and keyboard to setup your Pi Zero WH the first time.

You connections should look like the following: Connect this to one of the GPIO pins on the Zero WH such as GPIO4 (pin 7). The remaining pin on the DHT22 is the data pin and will be labeled ‘out’ or ‘s’ or ‘data’. Connect this to pin 6 Gnd (two pins below the 5V pin) on the Zero WH. The Gnd pin will be labeled ‘-’ or ‘Gnd’ or something equivalent. Connect this to pin 2 (the top right pin, 5V) of the Pi Zero WH. There should be a pin label for power on the DHT22 (e.g. The DHT22 will have three pins that you will need to connect to your Pi Zero WH - 5V, Gnd, and data. We also want something really easy to wire up without having to add a pull-up resistor or anything funky. We are using the DHT22 temperature/humidity sensor because of its temperature accuracy (+/- 0.5 ☌), humidity range (0–100%), and low cost. 1) No one is allowed to sell more than one unit per order for Zero W per Raspberry Pi rules (boo!) and 2) The Zero WH has the header pre-soldered, which will make our project assembly super quick and easy. We are using the $14 Zero WH instead of the $10 Zero W for two reasons.

As of the time of this writeup, it is hard to find a vendor that allows more than one Zero WH per order except for several UK vendors that have either no limit or a limit of 10. You can easily get each item above in bulk to minimize shipping costs with the exception of the Raspberry Pi Zero WH, which may be more challenging outside of the UK.

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The setup for each sensor node is going to cost ~$31 plus shipping (~$37+shipping with the case).

(Optional) Raspberry Pi Zero W case ($6).

DHT22 Temperature/Humidity Sensor ($5, two-pack for $10 here).

Here is the list of everything we need per sensor node and the approximate cost (minus shipping): Raspberry Pi temperature sensor network video tutorial The HardwareĪ perfect application for a $14 Raspberry Pi Zero WH is to Network Temperature Sensors as this device is compact, inexpensive, powerful, and has built-in WiFi.

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