kreyren/OSHW-System-On-Module
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Added projected cost, fabrication and usage upon brainstorm

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Jacob Hrbek 2023-08-04 04:18:43 +02:00 committed by Gitea
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@ -76,6 +76,29 @@ The issue with this solution is that the edge connectors have to have a bevelled
which adds extra cost (seems to be a minor added cost for fabrication)
## Projected cost, fabrication, development and usage of OSHW projects utilizing this standard
This standard is a blocker issue for kreyren's (author of this paper) OSHW tablet design for which the abstracted cost and fabrication process is:
1. Downloading the libre KiCAD designs for the "platform board" and send them them to local PCB fabricator (~25 EUR for 5 PCBs)
2. Buying the "Module Board" - For reference I bought OLIMEX's A20-SOM (https://www.olimex.com/Products/SOM/A20/A20-SOM) locally for 13 EUR/USD including shipping, first hand costs 35 EUR/USD
3. Download the chasis implemented in OpenSCAD/LibFive (projected to be generatable depending on what devices and configuration the user wants) and put that on a 3D printer (optionally using pre-optimized print to skip the slicer phase and get reproducible results (for technical materials as the chasis is designed to be printed using a PolyPropylen + GF30 which is very difficult to print)
4. Source additional components such as touch screen display, etc.. - Projected to have a list of compatible monitors and mediawiki for people to add where these can be bought locally..
* I can get a 10" touch screen display for <5 EUR from a e-recycling center which usually has a lot of them (and the chasis is functional design that can be generated to fit the display), ~30 EUR from second hand and 30-80 EUR online e.g. OLIMEX sells one for 78 EUR https://www.olimex.com/Products/OLinuXino/LCD/LCD-OLinuXino-10/open-source-hardware
* Battery seems to be around 15 EUR and is projected to be lower through OSHW battery design and BMS.
* No other components are abstracted to be needed in bare minimal configuration
5. Put it all together
To get fully libre tablet for the cost of :
* ~40 EUR in PCBs
* cost of the components - 20 EUR ~ 100 EUR
* 3D print - Assuming that people have access to a 3D printer or makerspace where they can use one (I have access to the 3D printer for free sponsored by city of Brno to all citizens and local makerspace costs ~5 EUR to use for a day outside of membership or asking makerspace member to let you in and print it for them for the cost of fillament), worst case paying for 3D print which is usually fee of ~10 EUR
That you can adjust to any kind of computing you want for ~25 EUR for new platform PCB with community support over e.g. Matrix
In terms of software if the chip has a linux mainline support then the path of least resistance is declaring a configuration file for armbian, example of one for OLIMEX Teres-A64 maintained by kreyren (author of this paper) is https://github.com/armbian/build/blob/main/config/boards/olimex-teres-a64.conf
The closest comparable project would be [OLIMEX Teres-A64](https://www.olimex.com/Products/DIY-Laptop) which kit costs 240 EUR, the cost of the mainboard from first hand is 80 EUR (https://www.olimex.com/Products/DIY-Laptop/SPARE-PARTS/TERES-PCB1-A64/open-source-hardware) and fabricating board with dimensions 113.5x89mm of 6 layers costs around 68~280 EUR for 5 boards without components.
### Additional Notes
Originally discussed in https://git.dotya.ml/kreyren/kreyren/issues/75