Arduino projects for auto electronics, mini ECU etc

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Re: Arduino projects for auto electronics, mini ECU etc

Post by manny » Thu Apr 14, 2016 11:29 am

AJL Electronics wrote:Not too difficult Manny. The first thing to do is to provide a potential divider, so that the pin Voltage can't rise above 5V. A three to one will do and will map 15V to 5V. ....
i meant i got it working using the LM35 temp sensor and indeed the divider...but then lost interest..but..seeing your post ..i may just break it out...its good fun..but i had steep learning curve with the C+ derived language..still have :lol:


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Re: Arduino projects for auto electronics, mini ECU etc

Post by AJL Electronics » Thu Apr 14, 2016 11:58 am

Would a seperate category for computer projects be a good idea? It may help people find previous relevant threads.


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Re: Arduino projects for auto electronics, mini ECU etc

Post by philhoward » Thu Apr 14, 2016 12:07 pm

What about the existing "Computer Issues etc" section if I change the name to include "projects"?...


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Re: Arduino projects for auto electronics, mini ECU etc

Post by td99 » Thu Apr 14, 2016 4:25 pm

philhoward wrote:What about the existing "Computer Issues etc" section if I change the name to include "projects"?...
My vote would be a separate section, incl other special ECU solution discussions. I think this is an interesting area for development and more likely to grow as these become increasingly practical.
In computer problems/projects it'll probably be swamped by Microsoft-haters and disillusioned upgraded (Appletalk for downgraded) Apple owners!


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Re: Arduino projects for auto electronics, mini ECU etc

Post by manny » Sat Apr 16, 2016 7:42 am

i was about to suggest the same, it would be interesting to see home brewed electronic wizardry develop :)

btw AJL- i broke out the Ardunio.... now i got loads of ideas that i wont complete!


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Re: Arduino projects for auto electronics, mini ECU etc

Post by AJL Electronics » Fri May 06, 2016 9:10 am

td99 wrote:
philhoward wrote:What about the existing "Computer Issues etc" section if I change the name to include "projects"?...
My vote would be a separate section, incl other special ECU solution discussions. I think this is an interesting area for development and more likely to grow as these become increasingly practical.
In computer problems/projects it'll probably be swamped by Microsoft-haters and disillusioned upgraded (Appletalk for downgraded) Apple owners!
I concur with this. A seperate category altogether and relevant threads moved into it would be ideal.


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Re: Arduino projects for auto electronics, mini ECU etc

Post by philhoward » Fri May 06, 2016 3:20 pm

Will have a look over the weekend chaps.


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Re: Arduino projects for auto electronics, mini ECU etc

Post by AJL Electronics » Sat May 07, 2016 8:59 pm

To kick off the ECU project, I need to know what I am trying to achieve. From what I can gather, lockup is enabled except for the following conditions:

1) Road speed below 45MPH

2) Engine temperature below normal

3) Throttle shut

4) Throttle wide open

5) Brakes applied

6) Kickdown swith active low

So sensors required by the CPU.

1) For road speed the gearbox handles that hydraulically although some other types don't. I may use a Hall effect sensor on the propshaft to cover that.

2) Engine temperature can be sensed with a link from the standard sender. Possibly intercepted by the fuse box, if it passes through there.

3) Throttle shut. Two ways that can be sensed; either a MAP sensor or by a TPS feed which would need installing, so preference to MAP sensor.

4) Throttle wide open. Easy as the kickdown switch will do that as it has to go to the ECU anyway.

5) Brakes applied. Easy enough to take an active high from the brake light circuit at the loom feeding the rear lights.

Other signals to be fed are gearbox temperature, petrol/gas switch, petrol tank sender, LPG tank sender and crash switch. Those are all available at the rear loom position where the fuel gauge computer is now.


Ouputs we need are

1) Fuel pump

2) kickdown solenoid energise

3) kickdown solenoid hold

4) fuel gauge

5) low fuel warning

6) gas solenoid enable

7) petrol solenoid enable


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Re: Arduino projects for auto electronics, mini ECU etc

Post by scimjim » Sat May 07, 2016 9:07 pm

You've fitted a micro switch for kickdown, so another on the same bracket for throttle closed would be logical (or a two position switch?)


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Re: Arduino projects for auto electronics, mini ECU etc

Post by AJL Electronics » Sat May 07, 2016 9:08 pm

'Tis a thought certainly.


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Re: Arduino projects for auto electronics, mini ECU etc

Post by scimjim » Sat May 07, 2016 9:09 pm

And unless the CPU is going in the boot, surely the brake signal would be simpler coming from the pedal switch?

Edit - you didn't actually state location, it just read like it :oops:


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Re: Arduino projects for auto electronics, mini ECU etc

Post by AJL Electronics » Sat May 07, 2016 9:12 pm

ECU is going to live in the passenger footwell where much of the wiring is. Easy to feed the existing signals from the boot area where the fuel gauge unit is now. Adding one wire to that mini loom is the neatest way.


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Re: Arduino projects for auto electronics, mini ECU etc

Post by simmit » Sat May 07, 2016 9:32 pm

Being strictly clockwork I know nowt 'bout electrickery so all the above is a complete mystery to me. Having said that and as a new comer to this forum I must say I find the level of knowledge displayed by members and their willingness to share it is something to treasure. More power to your elbows gentlemen and whilst I may not always understand what is behind your advice I do greatly respect and appreciate it. As I slowly bring my GTE back to life I thank you for being there and taking the trouble to help me along the way.



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Re: Arduino projects for auto electronics, mini ECU etc

Post by AJL Electronics » Fri May 13, 2016 9:31 am

Further musings..

The original LPG conversion was done as a rat's nest, which needs sorting out. Part of said nest, is a relay to sense engine running and shut down the gas if it stalls. It also gives a two second open solenoids signal on initial start. Clearly that function can also be handled by the Arduino and all the messy stuff ripped out as a result. All it needs added is a tacho input from the CB terminal on the coil, or an alternator charging signal from the WL terminal. That option would be easier on the software of course.


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Re: Arduino projects for auto electronics, mini ECU etc

Post by philhoward » Fri May 13, 2016 9:40 am

Moved to the new "Automotive Electronics" forum.


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