https://github.com/jyesmith/18650-backpack

Battery management system for your FPV goggles.
https://github.com/jyesmith/18650-backpack

18650 bms fatshark fpv goggles

Last synced: about 2 months ago
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Battery management system for your FPV goggles.

• Host: GitHub
• URL: https://github.com/jyesmith/18650-backpack
• Owner: JyeSmith
• License: mit
• Created: 2019-02-06T10:18:59.000Z (almost 6 years ago)
• Default Branch: master
• Last Pushed: 2019-02-19T10:24:08.000Z (almost 6 years ago)
• Last Synced: 2024-10-11T13:35:27.951Z (2 months ago)
• Topics: 18650, bms, fatshark, fpv, goggles
• Language: C++
• Size: 2.75 MB
• Stars: 26
• Watchers: 9
• Forks: 4
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

        
# 18650-Backpack

- 9V regulator... no more Fatshark alarm!

- Settable voltage alarm.  Default 3.10V with a secondary alarm at 3.00V (0.10V below set alarm voltage).  Configurable through the UI.

- Beeper alarm and flashing OLED.

- Monitors over all voltage, cell 1 and cell 2.  When using a Fatshark battery pack without a balance wire the cell voltage is pack voltage divided by 2.  This does not mean the batteries are balanced.

- Current sensor.

- mAh consumption.

- On time.

- Retains on time and mAh when powered down.  Can be cleared for a new battery by pressing any button while plugging in the battery.

- 12 character callsign.  Configurable through the UI.



https://www.youtube.com/watch?v=n1eo8pUAjkk



## Bill of Materials

The below links are give for reference so you know what to search for from your favourite/local supplier.

A hot air rework station (such as the 858D linked below) is required if you use the following BOM.  I used the Digispark Attiny85 and INA219 break out boards as donors for the 18650 Backpack.  This make life easier than ordering ALL of the components separately.

https://www.banggood.com/858D-220V-Hot-Air-Soldering-Rework-Station-Handle-Handle-Stand3-Nozzles-p-1129100.html

- Download the Gerber zip file from the PCB folder and upload it to https://jlcpcb.com, or your preferred PCB manufacturer.

- Digispark Attiny85 (cheap on ebay) https://www.banggood.com/ATTINY85-Mini-Usb-MCU-Development-Board-For-Arduino-p-971122.html

- 2 x INA219 High Side DC Current Sensor (cheap on ebay) https://www.adafruit.com/product/904

- Pololu 9V Step-Up Voltage Regulator U3V12F9 https://www.pololu.com/product/2116 ( for the Aussies https://core-electronics.com.au/pololu-9v-step-up-voltage-regulator-u3v12f9.html)

- OLED 128x32 https://www.banggood.com/0_91-Inch-128x32-IIC-I2C-Blue-OLED-LCD-Display-DIY-Oled-Module-SSD1306-Driver-IC-DC-3_3V-5V-p-1140506.html

- AT24C02 SOP-8 Serial EEPROM https://www.ebay.com.au/itm/10pcs-AT24C02-SOP-8-Serial-EEPROM-Memorizer-2KB/271441366188

- Buzzer https://www.banggood.com/5-PCS-Super-Loud-5V-Active-Alarm-Buzzer-Beeper-Tracker-95_5mm-for-Racing-Drone-p-1117207.html

- 2 x Tactile Push Button https://www.banggood.com/100Pcs-5-Pin-Tactile-Push-Button-Switch-Tact-Switch-6-X-6-X-3_1mm-SMD-p-1018679.html

- Power jack https://www.banggood.com/DC-Tip-Power-Plug-Jack-Connector-Dual-5_5-x-2_1mm-Male-Right-Angle-Cord-Cable-p-1161332.html

- 2s balance (male and female) https://www.banggood.com/40-set-2p-3p-4p-5pin-Right-angle-JST-XH-2_5mm-Male-Female-Lipo-Balance-Connector-p-1160571.html



## Flashing the Attiny85

The below can also be done with an Arduino Nano.

https://www.instructables.com/id/Program-an-ATtiny-with-Arduino/

- 1 - Ground

- 2 - D11

- 3 - D12

- 4 - D13

- 5 - D10

- 6 - +5V



## Core and Libs

- https://github.com/damellis/attiny

- https://github.com/datacute/Tiny4kOLED

- https://github.com/jmendeth/power-trinket/blob/master/sketch/_Adafruit_INA219.h (Adafruit_INA219.h using TinyWire)