myevse-webinterface 0.1.0

MyEVSE Webinterface based on MicroPython

MyEVSE Webinterface

MicroPython based Webinterface of MyEVSE

---

General

This is the webinterface of the MyEVSE

The current implementation does only run on a board with external SPI RAM. As of now up to 300kB of RAM are required. This is more than an ESP32-D4 Pico provides by default.

Get started

Install required tools

Python3 must be installed on your system. Check the current Python version with the following command

python --version
python3 --version

Depending on which command Python 3.x.y (with x.y as some numbers) is returned, use that command to proceed.

python3 -m venv .venv
source .venv/bin/activate

pip install -r requirements.txt

Flash firmware

To flash the MicroPython firmware as described on the MicroPython firmware download page, use the esptool.py to erase the flash before flashing the firmware.

esptool.py --chip esp32 --port /dev/tty.SLAB_USBtoUART erase_flash
esptool.py --chip esp32 --port /dev/tty.SLAB_USBtoUART --baud 921600 write_flash -z 0x1000 esp32spiram-20220117-v1.18.bin

Install package on board with pip

Connect to a network

import network
station = network.WLAN(network.STA_IF)
station.connect('SSID', 'PASSWORD')
station.isconnected()

and install this MicroPython packages on the device like this

import upip
upip.install('myevse-webinterface')

Upload additional files to board

Copy the boot.py and main.py files to the MicroPython board as shown below using Remote MicroPython shell

Open the remote shell with the following command. Additionally use -b 115200 in case no CP210x is used but a CH34x.

rshell -p /dev/tty.SLAB_USBtoUART --editor nano

Perform the following command to copy all files to the device

cp main.py /pyboard
cp boot.py /pyboard

Usage

Available ModBus registers

The available registers are defined by a JSON file and placed inside the /pyboard/lib/registers folder on the board during the pip package installation. This registers definitions file is loaded by the Webinterface class function setup_modbus_connection to configure the RTU-TCP Modbus bridge.

As an example the registers of a brainelectronics MyEVSE, MyEVSE on Tindie board is provided with this repo.

Configuration

The system can be configured via the config.json file. This file does not contain any sensitive data like network passwords or other keys.

The following things can be configured by the user on the /setup webpage.

Name	Description	Default
TCP_PORT	ModBus TCP port	180
REGISTERS	ModBus registers file, placed inside /lib/registers	modbusRegisters-MyEVSE.json
CONNECTION_MODE	Mode of WiFi connection	0

The CONNECTION_MODE supports the following modes

Value	Mode	Description
0	Setup	Setup WiFi connection via initial AccessPoint WiFiManager
1	Client	Connect to the configured networks as client, fallback to an open AccessPoint otherwise
2	AP	Create an open AccessPoint named MyEVSE