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merge rusEFI wiki

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Hellen81 is an ultracompact and cheap yet full-functional 8-Cylinder ECU board compatible with 81-pin M7.9.7/ME7.9.7/ME7.8.8/Yanvar7.2/Micas10.3.
The board is NOT compatible with 121-pin VAG ME7.x vehicles! For VAG, please see [Hellen121vag](https://github.com/rusefi/rusefi/wiki/Hellen121VAG).
***
The board is a part of Hellen-One family and currently is in "**work in progress**" state, meaning **NOT fabricated or tested yet**!
### Please do not use the gerber files, the board is not ready yet!
Key features:
* up to 8 ignition channels (logic-level) and 4 high-voltage built-in igniters;
* up to 8 injection outputs, 1 ETB, 10 low-side outputs, 2 push-pull outputs, 1 high-side output;
* 20 analog inputs, 3 digital inputs, VR sensor;
* USB-mini, CAN, K-Line, microSD, accelerometer;
The gerber files and schematics:
https://github.com/andreika-git/hellen81/
iBOM:
https://rusefi.com/docs/ibom/hellen81-a-ibom.html
Pinout table:
https://docs.google.com/spreadsheets/d/e/2PACX-1vSg41St_69moQ2rh92Mo4bStP-pNEcl9Qb2QOHikwrR-RgWGXKjmL9DsMgeUy9ewP8MYs3RSP3EftIc/pubhtml
![3D-rendered board view](https://raw.githubusercontent.com/andreika-git/hellen81/master/boards/hellen81-a/board/hellen81-a.png)