For discussion of Speeduino compatible boards designed / built by other members of the forum and for guidance around making such a board
By Rob
#70336
To help me learn about Speedunio and KiCAD I've decided to design my own board, I know there are loads of designs out there that I could use, many of which have all the features I want, but for me this is a lesson in learning / re-learning as much as anything else. I built my own MegaJolt 20 years ago so I figured this would make for a good follow-on project.

Below is the task I set myself, fairly modest compared to some but should be a good starting point for a four cylinder engine, let me know if I've missed anything obvious.

- 2x24 pin Delphi connectors (one connector for ignition & essentials and one for fuel & expansion)
- Built-in VR conditioner
- 4 Ignition Outputs
- 4 injector Outputs
- 4 outputs (fan, fuel pump, plus two AUX)
- Tach Out
- Built-in Wideband O2 Controller
- 6 Analogue inputs (O2, CLT, MAP, TPS, IAT, AUX)
- 2 Idle outputs (I'll confess I don't fully understand these)
- Bluetooth module with power cut when USB is connected

As I've been drawing up the schematic I've been testing the inputs on a breadboard and so far they seem to work quite nicely.

I've attached copies of both my proposed pin out and draft schematic, could you have a look and left me know if I've missed anything or if there's any blatant errors.
Attachments
Rob Heslop Speeduino Schematic.jpg
Rob Heslop Speeduino Schematic.jpg (1.95 MiB) Viewed 529 times
Rob Heslop Speeduino Pin Out.jpg
Rob Heslop Speeduino Pin Out.jpg (114.65 KiB) Viewed 529 times

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