Indoor Weather web app (and REST API) powered by a Raspberry Pi.
The web interface looks like this -
Weather data can also be obtained using a REST API (GET /api
). Example -
$ curl 192.168.1.200:8080/api
{"place": "Home", "temperature": {"units": "F", "value": 81.7}, "humidity": 44.6}
You will need the following -
- Raspberry Pi (any model)
- DHT-22 (or DHT-11) temperature/humidity sensor
- 10k resistor (as pull-up)
For the DHT, pin 1 is the leftmost (when facing the front i.e. the "grid" side) and pin 4 is the rightmost.
- Pin 1 -> 3V3
- Pin 2 -> Data to BCM GPIO #4 (change code to use other pins)
- Pin 2 -> 10k resistor -> 3V3
- Pin 3 - Not used
- Pin 4 -> Ground
This code uses the Adafruit_DHT
library to talk to the DHT sensor. The easiest way to install it is using pip
(sudo
will be required if not using a virtual environment) -
$ pip install git+https://github.com/adafruit/Adafruit_Python_DHT
If that fails, installing a few things may be required -
$ sudo apt-get install python-pip build-essential python-dev python-openssl
This step is required only if the defaults need to be changed. The code uses the following defaults -
- Web server is started on port 8080
- Data pin is connected to BCM GPIO #4 on the Raspberry Pi
- Sensor used is DHT-22
These can be changed in weatherpi.py
It needs to be run with root previliges to be able to use GPIO.
$ sudo python weatherpi.py
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