Introducing ElanBT

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Introducing ElanBT

Postby matts1972 » Fri 14.10.2022, 16:08

Hi all,

I have decided to start a new thread for this, as the ElanLogger thread has grown quite a bit already.

So here it is as promised: ElanBT, the cheap and ugly bluetooth ElanScan interface, that lets you connect wirelessly to your Elan:

Image Image

The picture on the left shows the parts required, and the one on the right shows the assembled and "finished product".

The three dangling lines on the right hand side picture go to the ALDL connector on the Elan. For testing purposes, I chose to do without a proper OBD1 connector.

You can easily build ElanBT yourself. This post contains all the information you need.

Parts list:
1 Arduino Uno development board
1 HC-05 Bluetooth module
2 100 ohm resistors
1 5.1v zener diode (1N4733A)
1 1k ohm resistor
1 2k ohm resistor
1 OBD1 connector
1 power switch
9 jumper cables to connect everything

Schematics:

Image

Trivial Arduino sketch: ElanBT.zip

As soon as you switch ElanBT on, you will be able to connect your laptop to the bluetooth device "HC-05" (pin:1234), and this will automatically add a COM-Port for ElanScan.

Do not get discouraged by the looks of it. This thing works great and is quite simple to build (and it made the Kessel Run in less than twelve parsecs).

If you want the whole thing in a less ugly and more compact form, you could replace the Arduino Uno with an Arduino Nano, add a simple voltage regulator (to bring down battery voltage to less than 12v for the Nano) and solder everything together inside an OBD1 connector.

Disclaimer: I have provided this information with best intentions, please use it at your own risk. In other words: try not to short your ECU.
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Re: Introducing ElanBT

Postby HJ2 » Fri 14.10.2022, 17:22

This is great Matts!

Thanks a lot, something to tinker around with :bowdown:
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Re: Introducing ElanBT

Postby matts1972 » Fri 14.10.2022, 17:28

HJ2 wrote:This is great Matts!

Thanks a lot, something to tinker around with :bowdown:


Yes, please do - from my recollection you should have most of the parts already purchased, HJ :D
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Re: Introducing ElanBT

Postby FunElan » Fri 14.10.2022, 17:58

This is great, thanks for sharing. Could be a foundation for a project I'm considering taking on....a digital oil temp/pressure/water temp gauge where the clock resides. Does anyone actually use the clock?
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Re: Introducing ElanBT

Postby Fredjohn » Fri 14.10.2022, 18:47

Matt great work. I am not particularly electronically minded, but perhaps you could copy your post with a few extra simple instructions and pictures and save it in the WikiLEC so it doesn't get lost in the depths of threads and posts.
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Re: Introducing ElanBT

Postby muley » Fri 14.10.2022, 20:06

Great news

I can recycle most of my wired version to do this


Very clever, thank you
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Re: Introducing ElanBT

Postby matts1972 » Sat 15.10.2022, 08:53

Fredjohn wrote:Matt great work. I am not particularly electronically minded, but perhaps you could copy your post with a few extra simple instructions and pictures and save it in the WikiLEC so it doesn't get lost in the depths of threads and posts.

I could not agree more and would like to put this on Wikilec. So far my requests for an account on Wikilec were unsuccessful, though, but I have sent another one yesterday.
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Re: Introducing ElanBT

Postby dapinky » Sat 15.10.2022, 10:39

Matt,

I have no control over the WikiLec accounts (that's Geoffs domain) - but if you want to create a simple set of instructions etc (Word, pdf or whatever file type) I can add it to the 'Manuals' website for inclusion there. Then create a WikiLec entry to link the two so it is easy to find.
Dave

Just the one now, but this one's mine! - and it will be finished eventually.....

go on - click this link - you know you want to!
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Re: Introducing ElanBT

Postby matts1972 » Sat 15.10.2022, 10:58

Thank you, Dave, I will do this and contact you via PM.
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Re: Introducing ElanBT

Postby HJ2 » Sat 15.10.2022, 12:53

matts1972 wrote:
HJ2 wrote:This is great Matts!

Thanks a lot, something to tinker around with :bowdown:


Yes, please do - from my recollection you should have most of the parts already purchased, HJ :D


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Re: Introducing ElanBT

Postby Tuga2112 » Mon 17.10.2022, 15:16

matts1972 wrote:If you want the whole thing in a less ugly and more compact form, you could replace the Arduino Uno with an Arduino Nano, add a simple voltage regulator (to bring down battery voltage to less than 12v for the Nano) and solder everything together inside an OBD1 connector.



its worth noting that the voltage regulator on the uno is extremely inneficient. therefore usind a nano + a PWD based regulator (also easily supplied on ebay) will be more energy efficient.

obviously... if you are driving a 30 year old car.. do you really care about efficiency ? :lol:
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Re: Introducing ElanBT

Postby matts1972 » Mon 17.10.2022, 17:22

Tuga2112 wrote:its worth noting that the voltage regulator on the uno is extremely inneficient. therefore usind a nano + a PWD based regulator (also easily supplied on ebay) will be more energy efficient.

obviously... if you are driving a 30 year old car.. do you really care about efficiency ? :lol:


Agreed, an additional 5 volts DC step down converter would be preferred. The Arduino Uno can handle 14 volts, so it can do without this extra component. The energy used is still negligible compared to any other electrical consumer in our cars.
For a small form factor you would replace the Uno with a Nano + DC converter. You could go even smaller with a Beetle BLE + a DC converter, as the Beetle BLE already includes the Bluetooth module.
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Re: Introducing ElanBT

Postby matts1972 » Tue 18.10.2022, 10:40

I am happy to report that I have tested this interface to work with ALDL Scan on Android. It is safe to say that it will also work with ALDLdroid, after building an .adx-file with information taken from the ElanScan .ini-file.

For my test I created an .aldl-file for ALDL Scan, that for the moment (and out of laziness) only displays PROM ID and TPS voltage. This worked flawlessly right away.
Find my .aldl-file below, to try this yourself (and perhaps add some additional sensors).

LotusM100test.zip
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