Use a PDA/Phone to bluetooth into MJLJ & change settings

manifold · Post by **manifold** » Fri Mar 23, 2007 11:39 pm

I had a crack at this as I thought it might be possible.

Basically you need a Socketcom bluetooth serial adapter, a bluetooth enabled pocketpc and the software that dh154 kindly provided on his website at http://ipaqsparker.tripod.com

First you need to put 3 jumper wires a few pins on the mjlj board, ie 1 wire from Pin 1 to Pin 4, 1 wire from Pin 1 to Pin 6 and another wire between pin 7 and pin 8. This is to enable handshaking to work with the socketcom cordless serial adapter as it only has flow control option set to CTS/RTS.

Plug in the socketcom cordless serial adapter into the megajolt serial port.

Next get hold of a pocket pc. I actually used a Compaq Ipaq 3800, with a jacket and put a Socket CF bluetooth adapter in it. Alternatively get a bluetooth pocket PC and find out what com port it transmits the bluetooth serial port on. Make a note of the port as you will need it later.

Pair the socketcom cordless serial adapter with the pocket pc.

Next you will need to download the pocketspark software as per the instuctions on dh154's site. Normally the pocketspark software uses COM1 to work. What I did was to look at the source code and amend the final section of the source to pick up my bluetooth port ie in my case it was COM3 as follows:

serial=seropenex("COM3:",4800,"8N1N",100);

you will see that I also changed 'serial' to serial=seropenex

this is because this function tells which com port to use. I then rebuilt the source using the pocketc program to take account of this change.

Then I reset the pda, and tried to connect.

The pocketspart asked which device to pick up in bluetooth, I told it to point to the socketcom device, and then the program loads.

You are then able to monitor and change settings as necessary. More convenient than a bluetooth laptop. Look no wires!

Put the Pocket PC back in your pocket when finished!

Happy to discuss.

Kind regards, David

manifold · Post by **manifold** » Fri Mar 23, 2007 11:48 pm

.... I forgot to mention.

It could be a great security measure too.

Whats to stop you typing in loads of bad ignition advance/retard figures thus disabling the car from starting.

No one would be able to start the car unless they knew how to unplug the megajolt
and put it in 'limp home mode'.

Go back to car and put in the correct ignition advance/retard figures from Pocket PC

David

Post by **brentp** » Fri Mar 23, 2007 11:56 pm

That is cool- I have a windows mobile smartphone, I'll have to give it a try. However, I will need a bluetooth adapter since I don't think my phone brings out a regular serial port.

Note the V3.2 firmware coming out will retain backwards compatibility, so this software will continue to work.

manifold · Post by **manifold** » Sat Mar 24, 2007 12:03 am

Hi Brent,

Yes I cant see why a windows mobile smartphone shouldnt work too if it has bluetooth built in. Pairing with the socketcom serial bluetooth adapter brings up the serial port services.

I bet a phone is even cooler, hadnt thought of that!....and a lot more convenient too if your just not quite happy with a setting and just fancy a change at a particular load/rpm ....or maybe just want to lock the car down for a day or two.

Kind regards,

David