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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

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

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Battery management system for your FPV goggles.

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