This repository holds a reimplementation of the QuantifiedArt project developed at the Bosch Internet of Things Lab at University of St. Gallen and ETH Zürich.
We aim to provide a self installable, understandable solution that everyone with the right hardware can build for him- or herself.
The used software aims to be run on Single Board Computers (SBC) such as the Raspberry Pi and is built to be as minimal in processing demands as possible. The architecture is tested on a Raspberry Pi B+ Model 1.2 and is expected to work on any revision of this SBC (RPi 2 / 3 / zero).
For now the code supports DHT-type temperature and humidity sensors and works with K30 carbon dioxide sensor modules from SenseAir. We aim to provide support for other air parameter sensors in the future to keep this project being adapted by more and more people.
- 1 x Raspberry Pi B+ 1.2
- 1 x MicroSD-Card >= 8.0GB
- 1 x DHT-22 (AM2301) temperature and humidity sensor
- 1 x SenseAir k30 carbon dioxide sensor module
- 7 x Dupont wire jumpers
- 1 x Micro-USB cable
- 1 x HDMI display cable
Connect the serial port of the k30 carbon dioxide sensor with the serial port of the raspberry pi:
| pin RPi | function RPi | pin k30 | function k30 |
|---|---|---|---|
| 4 | vcc | 33 | vcc |
| 6 | gnd | 32 | gnd |
| 8 | tx | 34 | rx |
| 10 | rx | 35 | tx |
| pin RPi | function RPi | color dht | function dht |
|---|---|---|---|
| 2 | vcc | red | vcc |
| 14 | gnd | black | gnd |
| 12 | gpio 18 | yellow | data |
Transfer the image to the MicroSD-Card and put it in the corresponding slot in the Raspberry Pi.
Download a Raspbian distribution of your choice. If you are working with a Raspberry Pi 3 I highly recommend PIXEL as it comes with the needed window manager and chromium browser installed: https://www.raspberrypi.org/downloads/raspbian/
sudo raspi-config
--> Expand Filesystem
--> Advanced Options --> Serial --> < No >
dmesg | grep tty
If ttyAMA0 does not show up, re-enable serial port:
sudo nano /boot/config.txt
Add, change or uncomment the line:
enable_uart=1
To enable full screen output add or uncomment the line:
disable_overscan=1
If you are working with a Raspberry Pi 3 add the following line to disable bluetooth:
dtoverlay=pi3-disable-bt
sudo apt-get update && sudo apt-get upgrade -y
sudo apt-get dist-upgrade
sudo apt-get clean
sudo apt-get install --no-install-recommends xserver-xorg -y
sudo apt-get install --no-install-recommends xinit -y
sudo apt-get install lxde-core lxappearance -y
sudo apt-get install lightdm -y
sudo apt-get install chromium-browser -y
sudo apt-get install nodejs npm -y
sudo npm install -g n
sudo n 6.9.1
sudo npm install -g npm@latest
sudo apt-get install git -y
git clone https://github.com/ameeuw/qaJS
./qaJS/install/disableScreensaver.sh
< yes > ... < yes >
We are using the Adafruit_DHT Library to read out the DHT family of temperature and humidity sensors. To install the library use pip install Adafruit_DHT or install manually as described in the Adafruit git repository.
For communication with the CO2 sensor, we are using python serial. Use pip install serial if not installed (comes with PIXEL).
Additional infos:
cd install
tar zxvf bcm2835-1.xx.tar.gz
cd bcm2835-1.xx
./configure
make
sudo make check
sudo make install
cd node
npm install node-dht-sensor
npm install serialport
/usr/share/plymouth/themes/pix/splash.png
sudo nano ~/.config/lxsession/LXDE/autostart
With Raspbian PIXEL:
sudo nano ~/.config/lxsession/LXDE-pi/autostart
Add line:
@/home/pi/qaJS/launch.sh pyserver
or
@/home/pi/qaJS/launch.sh nodeserver
depending on your preferences.
To hide the cursor:
sudo apt-get install unclutter
@unclutter -idle 0.1 -root
Follow this guide.
If you are launching from an SSH session, make sure to set the $DISPLAY variable:
export DISPLAY=:0
./launch.sh