J1772 EVSE firmware for ESP32 based devices.

Key features

• Hardware abstraction for device design
• Responsive web-interface
• OTA update
• Integrated energy meter
• REST API
• WebDAV
• Modbus (RS485, TCP)
• Lua scripting
• Nextion HMI
• Scheduler

Device definition method

One firmware to rule them all. Not really :-) one per device platform (ESP32, ESP32-S2...).

There is no need to compile the firmware for your EVSE design. Source code ist not hardcoded to GPIOs or other hardware design features. All code is written in ESP-IDF without additional mapping layer like Arduino.

All configuration is written outside firmware in configuration file named board.cfg on dedicated partition. For example, on following scheme is minimal EVSE circuit with ESP32 devkit.

For this circuit there is board.cfg, for more information's see Wiki.

#Device name
DEVICE_NAME=ESP32 minimal EVSE
#Button
BUTTON_WIFI_GPIO=0
#Pilot  
PILOT_PWM_GPIO=33
PILOT_ADC_CHANNEL=7
PILOT_DOWN_THRESHOLD_12=2410
PILOT_DOWN_THRESHOLD_9=2104
PILOT_DOWN_THRESHOLD_6=1797
PILOT_DOWN_THRESHOLD_3=1491
PILOT_DOWN_THRESHOLD_N12=265
#AC relay
AC_RELAY_GPIO=32

Web interface

Fully responsive web interface is accessible local network IP address on port 80.

Dashboard page

Settings page

Mobile dashboard page

Hardware

ESP32DevkitC EVSE

Dev board with basic functionality, single phase energy meter, RS485. One side pcb, for DIY makers easy to make at home conditions ;-)

EasyEDA project

ESP32-S2 EVSE DIY ALPHA

ESP32-S2 based EVSE with advanced functionality, three phase energy meter, RS485, UART, 1WIRE, RCM, socket lock.

EasyEDA project

Quick demonstration video

Donations

ESP32 EVSE firmware is free, but costs money to develop harware and time to develop software. This gift to the developer would demonstrate your appreciation of this software & hardware and help its future development.