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SAE J1772:2010 EVSE Control Board Module EVSE3

3/20/2012: the EVSE 3 is no longer a product and has been replaced by the EVSE4

This is a continuation of the first versions with the LCD display that was first built in February 2010.

The new version, EVSE3 continues as a reconfigurable design to finalize the options.

The primary design target is LCD with optional basic start/stop buttons.  It an also be configured for just status LED's or a communications design that uses Ethernet or ZigBee.

The module produces the J1772 pilot signal and monitors it do determine what is needed in the charging cycle.

When the J1772 requirements are met, the control board has an output that actuates a power contactor that supplies electrical power to the J1772 connector and the vehicle.

The board operates on safe 12 to 24 volts DC.

This board has the Ethernet adapter and no LCD display.  It is intended to be used with a central computer to enable and monitor charging.

The Ethernet or ZigBee interfaces have drivers so they appear as serial ports on Windows computers. 

Simple commands and messages allow remote control from  your computers human interface.

The next project is adding hardware to monitor power voltage and current to use the DSP to calculate the power used and report it.
Many people are interested in the actual charge power.  Businesses offering free public charging want to know what this service is actually costing them and how many people are using it.

This will lead to a universal board, well a first generation, that can do a number of different interfaces and control options.  From simple start/stop and a few LED's to complex serial communications.

The new 4 layer PCB design  still has jumpers but as the options get refined they will get reduced

There are 3 inputs for start, stop, and inhibit switches.

Data can be displayed on the LCD, 4 LEDs, a 10/100 network port, or ZigBee.

An option is being planned for measuring the power used by the EVSE.

We hope to have units for evaluation in 4 weeks.


The first few boards are build and ready to be tested.  The display identifies itself and things seem to be working.

Calibration, output voltages, and timing need to be verified.

The board shown has the LCD and switch inputs for START, STOP and INHIBIT.  Other configurations will have Ethernet 10/100 connections.

This is a good looking board and does not have the prototype look of the previous revision, but for generation 3 that should be expected.

On the back side there are 4 status LEDS: Ready, Connected, Charging, and Error.

For the J1772 Pilot signal there also is the switches to set the available current.

Since the board is very flexible and we have full control over the internal software we can easily make changes and modifications for specific applications.

Cost is $200 for the basic LCD version
Cost is $210 for the basic LCD version with a GFI fault input
Cost is $250 for the Ethernet version

To add the 3 switch inputs, Stop, Start, Inhibit will add $25.

    Instructions and Overview
    Wiring Drawings
    NEC compliance notes
     Notes from Norway



modular EV power LLC, all rights reserved, 2011