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Update

Run the following commands to every raspberry pi:

sudo apt-get update
sudo apt-get -y upgrade
sudo reboot

Connections of the lights

Each light has 13 lights, as shown in the image. The raspberry pi 2 has 40 pins, as shown in the image. In order to operate correctly, the connections that must be used are hihglighted in the image. For reference, these are the correct connections:

  • GPIO17 - straight green
  • GPIO18 - straight yellow
  • GPIO27 - straight red
  • GPIO22 - left green
  • GPIO23 - left green
  • GPIO24 - left red
  • GPIO25 - right green
  • GPIO5 - right yellow
  • GPIO6 - right red
  • GPIO12 - walk left right green
  • GPIO13 - walk left right red
  • GPIO19 - walk up down green
  • GPIO16 - walk up down red

The above connection must go first to a relay, and then the output of the relay must go the the actual lights. If a trafic light has no light for one side of the road (for example, if no road to the right is presented), then the corresponding connections must be left unwired. If a trafic light contains more than on light in one connection, connect these lights in parralel after the relay. For better performance, the 5.5V and GRD wire of the relays can be provided through other circuit and not the raspberry pi.

The trafic lights must be connected with each other in a local network. As the raspberry pi has an ethernet port, the idial connection is through a switch with 4 ports.

Software configuration

Server

Install the following packages:

sudo apt-get -y install mysql-server mysql-client apache2 libapache2-mod-auth-mysql php5-cli php5-mysql php5 libapache2-mod-php5
sudo a2enmod auth_mysql
sudo service apache2 restart

Connect to the database:

mysql -p -u root

In the mysql cliend, copy and paste the commands that are located in the create_tables_raspberry_server.

Copy the files from the folder src/raspberryServer/var/www to the folder /var/www:

sudo cp src/raspberryServer/var/www/* /var/www

Copy the file src/raspberryServer/opt/trafficLight/traficLightServer.py to /opt/trafficLight/traficLightServer.py:

sudo mkdir /opt/trafficLight/
sudo cp src/raspberryServer/opt/trafficLight/traficLightServer.py /opt/trafficLight/traficLightServer.py

In order to run this script on boot time, add the following line to /etc/rc.local:

 sudo python /opt/trafficLight/traficLightServer.py 2>&1 > /var/log/traficLightServer.log &

In order connect to the web interface, use the url serverip/statusConfiguration.php. The default username and password are both admin. After sucessfull login, you can change the password.

Trafic lights

The trafic light client must run on every raspberry (it must also run in the rusberry that acts as a server).

Copy the file src/raspberryClient/opt/trafficLight/traficLightClient.py to /opt/trafficLight/traficLightClient.py:

mkdir /opt/trafficLight/
sudo cp src/raspberryClient/opt/trafficLight/traficLightClient.py /opt/trafficLight/traficLightClient.py

In order to run this script on boot time, add the following line to /etc/rc.local:

sudo python /opt/trafficLight/traficLightClient.py 2>&1 > /var/log/traficLightClient.log &