DIY (or cheap) Bluetooth Adapter

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andykao
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DIY (or cheap) Bluetooth Adapter

#1 Post by andykao » Thu Dec 12, 2019 10:07 am

I'm looking for an LPG ECU bluetooth adapter - i have an AC STAG Qmax 300 Plus installation set up and i plan to use the bluetooth connection for auto calibration and checking the LPG parameters, consumption, etc.

I have a regular ELM327 Bluetooth OBD adapter - is there any way i can connect i to the LPG ecu? Not sure if possible, which pins go where...

Also i found on this forum a DIY solution here : https://www.lpgforum.co.uk/viewtopic.php?f=33&t=12836
I can get all the parts listed there cheaply, i can solder and stuff, but there's no schematic to it, don't know what goes where... anyone have any more details about this setup?

Or i could buy a bluetooth adapter if i find a cheap one, but the best i could find was about 50-60 EUR plus shipping.

Any help would be appreciated...

LPGC
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Re: DIY (or cheap) Bluetooth Adapter

#2 Post by LPGC » Thu Dec 12, 2019 10:30 am

I don't think it'll be possible to use an ELM327 to talk to an LPG ECU, ELM327's are usually capable of several protocols but RS232 isn't one of them and the LPG uses RS232.

You could PM Hardcorepit80 who started the thread you linked to? Would imagine his setup uses an Arduino that has RS232 and Bluetooth onboard so the wiring to the LPG plug would be very simple (then you'd just need to make the psu for it) but you'd need to program the Arduino.

Or buy a purpose made unit https://www.lpgshop.co.uk/search-result ... =bluetooth but like you say they're £60+. When you weigh up the cost of buying the Arduino, making a psu for it and trying to keep it all neat, simple and engine bay proof it may seem a better idea to just buy a purpose made unit off-shelf.

I've got a few LPG system bluetooth dongles but I don't use them much, prefer to use a cable as baud speed is much better (and the bluetooth signal can drop out, in which case you have to wonder if it's just the bluetooth signal dropped out or whether the LPG ECU has stopped talking/responding).
Full time LPG installer
Servicing / Diagnostics / Repairs to all systems / DIY conversion kits supplied with thorough tech support
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andykao
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Re: DIY (or cheap) Bluetooth Adapter

#3 Post by andykao » Thu Dec 12, 2019 10:55 am

LPGC wrote:
Thu Dec 12, 2019 10:30 am
I don't think it'll be possible to use an ELM327 to talk to an LPG ECU, ELM327's are usually capable of several protocols but RS232 isn't one of them and the LPG uses RS232.

You could PM Hardcorepit80 who started the thread you linked to? Would imagine his setup uses an Arduino that has RS232 and Bluetooth onboard so the wiring to the LPG plug would be very simple (then you'd just need to make the psu for it) but you'd need to program the Arduino.

Or buy a purpose made unit https://www.lpgshop.co.uk/search-result ... =bluetooth but like you say they're £60+. When you weigh up the cost of buying the Arduino, making a psu for it and trying to keep it all neat, simple and engine bay proof it may seem a better idea to just buy a purpose made unit off-shelf.

I've got a few LPG system bluetooth dongles but I don't use them much, prefer to use a cable as baud speed is much better (and the bluetooth signal can drop out, in which case you have to wonder if it's just the bluetooth signal dropped out or whether the LPG ECU has stopped talking/responding).
i already have an arduino, psu and all the stuff so it wouldn't be too much trouble to put it together. will pm and ask for more details

Brian_H
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Re: DIY (or cheap) Bluetooth Adapter

#4 Post by Brian_H » Thu Dec 12, 2019 5:58 pm

Is this any good to you? £26.00 + £7 shipping?
https://www.ebay.co.uk/itm/LPG-CNG-GLP- ... 3488968940

I've used the same type of adapter from the same seller on KME Nevo without a problem with an Android phone, Wouldn't necessarily want to try calibration with them, but they are ideal if you need to calibrate the fuel levels or check for fault codes when out and about, as you don't need to lug a laptop around to connect.

The only thing i would say lets that seller down, is they sent mine in an envelope rather than proper packaging, which was very battered once it turned up, but it was at least still there (and if yours turned up without the contents, you should be able to sort via eBay if it came to it)

LPGC
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Re: DIY (or cheap) Bluetooth Adapter

#5 Post by LPGC » Thu Dec 12, 2019 7:07 pm

Nice one Bri :-)

I just bought one too, mostly out of interest but I'll give it a testing at some point and probably keep it as a spare.
Full time LPG installer
Servicing / Diagnostics / Repairs to all systems / DIY conversion kits supplied with thorough tech support
Mid Yorkshire
2 miles A1, 8 miles M62,
http://www.Lpgc.co.uk
Twitter https://twitter.com/AutogasSimon
07816237240

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