How to control batteries with Daly-Smart-BMS and Raspberry Pi via UART

Quick-Start-Guide

Before you start:

• In the folder FINAL you can find two python scripts bms_reader.py and i2c_display.py.

• Both python files needs to be started with two different ssh-connections via the terminal of your computer.

• If you want to quit both files, a keyboard input is necessary. Use ctrl + c to quit.

• Raspberry Pi name: test@bp1 and bp2@bp2

• Raspberry Pi password: batteryproject

Explanation bms_reader.py:

• When you start the bms_reader.py, every fifteen seconds a new json file is generated.

• Json file contains: soc, voltage, current, temperature and capacity.

• All json files have an individual Unix timestamp in their file name.

• Json file name example: battery_data_{timestamp}.json.

• They're all saved in the folder: battery_data_json.

Explanation i2c_display.py:

• When you start the i2c_display.py, it checks if a new json file arrived in the folder.

• If a new file is found, it extracts the battery data from the json file.

• And is then visualized on the I2C-display.

How to start the BMS-reader for Daly-Smart-BMS

1. Open this folder:

   cd Desktop/team-bms
   

   This folder contains:

   • folder: battery_data_json (includes all generated json files)

   • python file: bms_reader.py

2. Start the python script:

   python3 bms_reader.py
   

How to start the I2C-display for Raspberry Pi

1. Open this folder:

   cd lcd
   

   This folder contains:

   • display drivers

   • python file: i2c_display.py

2. Start the python script:

   python3 i2c_display.py
   

How to make your own battery reader from scratch

Required components

• 2x Raspberry Pi 5 Berrybase

• 2x LORA-HAT for Raspberry Pi Waveshare

• I2C-Display for Raspberry Pi AZ-delivery

• Logic Level Converter for I2C-Display Amazon

• Daly Smart BMS 3S 12V 30A Amazon

• 3x 18650 Li-Ion battery cell Akkushop

• Bracket for 18650 Li-Ion battery cell Amazon

• Breadboard Amazon

• Jumper Wire Amazon

Step-by-Step Guide

1. Setup the Hardware

• Wire the three Li-Ion battery cells to the Daly-Smart-BMS:

For more information check this website: Daly

• Connect the Daly-Smart-BMS with the enclosed UART-USB-A cable to Raspberry Pi.

• Connect the I2C-display to Raspberry Pi with the help of this Pinout:

For more information check this website: Tutorials-RaspberryPi

2. Package installments

• Python Module for Daly-Smart-BMS:

pip install dalybms

For more information check this website: PyPi

• GitHub Repository for I2C-Display drivers:

git clone https://github.com/the-raspberry-pi-guy/lcd.git

Important: i2c_display.py needs to be saved in this folder, so that drivers are working correctly.

For more information check this website: GitHub