OpenEVSE/open_evse

Firmware for Open EVSE

OpenEVSE

Firmware for OpenEVSE controller used in OpenEVSE Charging Stations sold in the USA, and OpenEnergyMonitor EmonEVSE units sold in (UK/EU).

• OpenEVSE: https://store.openevse.com/collections/all-products
• EmonEVSE: https://shop.openenergymonitor.com/evse/

Based on OpenEVSE: Open Source Hardware J1772 Electric Vehicle Supply Equipment

USA

TODO: add notes about USA OpenEVSE

UK/EU

• Disable AUTOSVCLEVEL (autodetection is designed for split-phase)
• Charging level default to L2
• Set MAX_CURRENT_CAPACITY_L2 32 (limit for single-phase charging in UK/EU)
• Add '.EU' to version number
• Enable LCD Redraw every couple of min (required for EMC/CE)

EmonEVSE

EmonEVSE (non-tethered type-2 EVSE unit)

• PP_AUTO_AMPACITY enabled to set max current based on non-tethered cable connected
• Three-phase option with THREEPHASE enabled to calculate three-phase energy ( Unneeded with ESP32_WiFi firmware >= 4.2

API Documentation

• WIFI API: http://github.com/openevse/ESP32_WiFi_V4.x/
• RAPI API: https://github.com/openenergymonitor/open_evse/blob/master/firmware/open_evse/rapi_proc.h

Resources

• OpenEnergyMonitor OpenEVSE Setup Guide

• OpenEnergyMonitor OpenEVSE Shop

• OpenEVSE Controller Datasheet

• OpenEVSE Controller Hardware Repo

• OpenEVSE Project Homepage

---

Firmware compile & upload help: firmware/open_evse/LoadingFirmware.md

NOTES:

• Working versions of the required libraries are included with the firmware code. This avoids potential issues related to using the wrong versions of the libraries.
• Highly recommend using the tested pre-compiled firmware (see releases page)

Flash pre-compiled using avrdude

$ avrdude -p atmega328p -B6 -c usbasp -P usb -e -U flash:w:firmware.hex

ISP programmer required e.g USBASP

Set AVR fuses

This only needs to be done once in the factory

avrdude -c USBasp -p m328p -U lfuse:w:0xFF:m -U hfuse:w:0xDF:m -U efuse:w:0xFD:m -B6

If writing eFuse fails ISBasp may need a firmware update

---

Tip Jar: I developed/maintain this firmware on a volunteer basis. Any donation, no matter how small, is greatly appreciated.

Open EVSE is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

Open EVSE is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Open EVSE; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.

* Open EVSE is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.