We have developed a board based on PIC microcontroller which is able to generate 1kHz PWM signal to detect the vehicle and control the relay. It is also possible to adjust PWM width for current regulation. The board is ready to be installed as wallbox.
The new EVSE KIT wallbox brings improved design, more functions and support of Positive and Negative PWM modulation (required by TESLA vehicles). It comes with ready-made connectors so there is no soldering needed.
Here is an example use of this kit:
See also the EVSE section at GWL/Power blog http://gwl-power.tumblr.com/tagged/EVSE
To make your own charging station you will also need a technical skills, wires, outdoor box and also a propper connector (Yazaki, Mennekes).
Please see manual of EVSE1.1 to see how to connect the board.