Firefox OS/BatteryHarness
Battery Harness
Cost Analysis
Option 1
| Part | Cost |
|---|---|
| Harness | $100 |
| Ammeter | $90 |
| PCB | $10 |
| Assembly Labor | 1 hour |
| Total | $200 plus 1 hour |
We outsource the harness to be printed by 3DPhactory in Toronto - they charge $96 plus shipping.
The ammeter is ordered from (http://www.yoctopuce.com/EN/products/usb-sensors/yocto-amp), and costs about $90 including shipping.
Option 2
| Part | Cost |
|---|---|
| Harness | $20 |
| Ammeter/PCB | $30 |
| Assembly Labor | 1-2 hours |
| Total | $50 plus 1-2 hours |
Our Printer
http://store.javelin-tech.com/Store-Catalog/Mojo-3D-Printer
Buy: $10,000 (approximately)
Lease: $200 per month (not sure about this - they lease in the US for $185/month)
Regardless of buy or lease, the harness part will cost ~$20 each to print
Custom Boards
I already have the tools to prototype & build a small number (10-20) of the custom boards, but if we want to make 100's of them, we should outsource that. The labor to assemble the harness would be 1 hour if we outsource building the board, or 2 hours if I build it
Initial Quantities
The performance team will require approximately 14 harnesses for our internal use (7 team members, 2 phones each)
The automation team requires 15 harnesses for their initial work, and possibly several hundred in the future.
The Taipai performance team will require 2-3 harnesses for building typical use case scenarios involving power usage.
Individual developers who are concerned about power usage may want a harness to allow them to develop their patches and features with low power usage impact.
Prototyping for a New Device
Each new device introduced requires several iterations of the 3D printed harness part (which has to be made to fit the case and battery with very tight tolerances). The custom ammeter board will work with any phone, and only a small daughterboard needs to be custom built for the specific phone/battery combination.
In terms of time, prototyping a battery harness for a new device will require 2-3 days of actual time, spread over a week (to allow for parts order & delivery).