[Rob]

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.

[Rob]

I've done a bit of updating and here's my final design:

[Rob]

This is my test rig that I've been using to verify the various input & output circuits, it's effectively a hacked V4 board, a mini running Ardustim and a Raspberry PI which I'll be loading Tuner Studio on in the near future to allow for further testing.

[Rob]

I've got the PCBs made by PCBWay and they look pretty good, now I just need to solder one up and find out if I've made any mistakes.

[Rob]

Edit, in case you're wondering yes I had to place a number of resistors and the clamp under the Arduino as space was that tight.

[le_nana]

Congratulations to you rob

[Rob]

Thank you, I definitely learnt a lot creating it

[NickZ]

Just a heads up, the logo you are using is a breach of licence.
https://wiki.speeduino.com/en/dev/Trademarks

So if your not selling them should be ok.