Joulie-16-LCD

buildroot config for a Battery info screen with web ui for the Raspberry Pi reworked to utilise the UDP Multicast protocoll enabled via DIP Switch 8 since version 1.14 of the JouLie-16

Required HW:

× Raspberry Pi

× Class 10 Micro SD Card with at least 4GB

Optional HW:

× 20x4 I2C LCD

× 3.3V to 5V Level shifter

×Jumper wires and/or a small circuit board

Instructions for building:

• Get the latest stable Buildroot release from (https://buildroot.org/downloads/buildroot-2019.08.tar.gz)
• Unpack the buildroot tar
• Clone this repo
• Move the overlay dir into the unpacked buildroot dir
• Move the config file into the buildroot dir and rename it to .config
• Open a Terminal in the buildroot dir
• Run make menuconfig and check the Target options to make sure the config was loaded
  • Target Architecture (ARM (little endian))
  • Target Binary Format (ELF)
  • Target Architecture Variant (arm1176jzf-s)
• Quit the menuconfig by hitting ESC until you return to the Terminal
• Run make to start building your image. This requires an active internet connection to download all the packages. This will take a couple of hours depending on your system.
• Once finished, navigate your file browser to the output/images dir where you will find a sdcard.img file. This is your SD card image.
• Alternatively you can download a prebuilt Image here: (https://drive.google.com/drive/folders/1bVy2NC1GEXSF4w1Ivt7RKugK-Z9H2YX_?usp=sharing)
• Write that image file to your SD card either using dd on Linux systems or using https://etcher.download
• Unmount the SD Card and plug it into your Pi
• Connect the I2C LCD to the Pi according to the instructions below. Most LCD's will run off of 3.3V with usable but not good contrast, so a level shifter is recommended.

Connect the components as follows. You can either use jumper wires or solder the components to a piece of through-hole board.

LCD SCL → Shift 1 → Pi Pin 5

LCD SDA → Shift 2 → Pi Pin 3

LCD GND → Shift GND → Pi Pin 6

LCD Vcc → Pi Pin 2

Shift HV → Pi Pin 4

Shift LV → Pi Pin 1

• When directly connecting the LCD to the Pi, power the LCD from Pin 1 instead of Pin 2 from the Pi
• Connect the Pi to the same network as the BMS. This can be through a switch as long as they're in the same network and the Pi can receive the UDP Multicast packets
• Power up the Pi
• The Pi should boot within ~2 minutes
• You should now see the battery status on the LCD
• Now you can open up a browser and go to (http://autarctech-bms/) to view the web interface.
• If you are directly connected to the BMS then call up this address: http://10.214.161.1
• Debugging via SSH:
  • Username: root
  • Password: AutarcTech

To Do:

• Proper interactive Web Interface
• CANBUS Mode
• Cloud?
• Better local screen. Maybe a TFT? Or a HDMI Screen?