Synopsis

A simple, extensible web server for fetching and logging weather information and displaying nicely on a screen.

Dependencies

• forecastio
• python-flask
• matplotlib
• w1thermsensor (optional)

Hardware

• Raspberry pi
• DS18B20 1-wire temperature sensor (optional)

Setup

Install with pip and virtualenv:

python3 -m virtualenv ~/wallberry
source ~/wallberry/bin/activate
pip install wallberry-uberpotato

Requires a DarkSky API key (free from https://darksky.net/dev). Change the example config file to include your key and your location. Save config file as config.py

Usage

Start the server on your local network by running sh wallberry/server.sh & Open a web browser and navigate to localhost:5000

For a wall-clock, use crontab and screen to automatically start on boot

sudo apt-get install screen
crontab -e

add the following:

@reboot /usr/bin/screen -dmS Server /bin/sh ~/wallberry/server.sh
@reboot /bin/sh ~/wallberry/start.sh
0 7 * * * /bin/sh ~/wallberry/start.sh
0 23 * * * /bin/sh ~/wallberry/stop.sh

This will start a full-screen kiosk browser, and turn off the screen automatically from 11pm to 7am.

Included also is an example python script for a PIR motion sensor for automatically turning on and off the screen

Adding sensors

Send temperature, humidity, and pressure data to the server with a POST requst to /log with the format

{
  name: <My Sensor Name>,
  temperature: <Temp>, (optional)
  humidity: <Humidity>, (optional)
  pressure: <Pressure> (optional)
}

An example script weatherPOST.py is included for reference using a DS18B20 sensor. To set up this sensor on a rpi:

Normal mode:

Connect Vdd to 3.3v, data to gpio-4, ground to ground, pullup resistor between Vdd and data

to /boot/config.txt add:

dtoverlay=w1-gpio,gpiopin=4

4 is the default w1 gpio pin

to /etc/modules add:

w1-gpio
w1-therm

Parasitic mode:

Connect Vdd shorted with ground, data to gpio-4, pullup resistor between Vdd and data

to /boot/config.txt add:

dtoverlay=w1-gpio,gpiopin=4,pullup=1

to /etc/modules add:

w1-gpio
w1-therm strong_pullup=2

Call w1thermsensor ls to list the hardware addresses of all connected sensors

Viewing log history

A GET request to /log yields a date range selection and simple graph