https://github.com/becem-gharbi/battery-energy-monitor

A device that records voltage and current of a battery over time
https://github.com/becem-gharbi/battery-energy-monitor

battery-monitor esp8266

Last synced: 27 days ago
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A device that records voltage and current of a battery over time

• Host: GitHub
• URL: https://github.com/becem-gharbi/battery-energy-monitor
• Owner: becem-gharbi
• Created: 2023-05-01T10:09:50.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2024-01-05T06:31:10.000Z (10 months ago)
• Last Synced: 2024-01-05T07:32:47.895Z (10 months ago)
• Topics: battery-monitor, esp8266
• Language: Vue
• Homepage: https://ss-bem.vercel.app
• Size: 14.4 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md

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README

        
# Battery Energy monitor

An embedded device that periodically reads a battery voltage and current through shunt resistor. Then saves the measurement to a Micro SD card. The output files can further be uploaded to a web app which displays the current, voltage and power graphs interactively.

## Hardware

- Microcontroller ESP8266 E12 module

- Analog multiplexing using CD4053

- Voltage sensing up to 84V

- Bidirectional current sensing up to 27A

- Analog filtering & buffering using LM348 opamp

- RTC using DS1302

- Designed with Proteus v8.12

## Firmware

- Platform espressif8266

- Framework arduino

- IDE Platform IO

## Web app

- Built with Nuxt 3

- Interactive charts via Highcharts library

- UI components based on NaiveUI library

- UI utilities via Tailwindcss

## Settings

The device can be setup via `settings.json` file, which should be placed and read from SD card.

| Field         | Value                                              | Notes                                  |

| ------------- | -------------------------------------------------- | -------------------------------------- |

| debug         | Enable firmware debugging                          | Should be set to 0 on production       |

| sampleRate    | The rate of analog reading in ms                   | Should be larger than 300ms            |

| savingRate    | The rate of writing to SD card in ms               | Should be larger than sampleRate       |

| currentGain   | The gain by which the analog reading is multiplied | Emperical or by calibration calculator |

| currentOffset | The offset by which the analog reading is biased   | Emperical or by calibration calculator |

| voltageGain   | The gain by which the analog reading is multiplied | Emperical or by calibration calculator |

| voltageOffset | The offset by which the analog reading is biased   | Emperical or by calibration calculator |

## Notes

- The design of analog circuits is based on TI notes located under `/documents`.

- For components dimensioning refer to `Calibration.xlsx` sheet.

- The functioning of the circuit is supposed to be linear. Saturation should be taken into consideration, e.g LM358 output is saturated around 3.6V on 5V supply voltage.

- ESP8266's ADC transfer function should be defined empirically for precise measurement.

- The folder `battery_energy_monitor` located under `Place content inside in SD` should be placed at the root directory of the SD card. Then should be uploaded to the web app.