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Certified O.G.
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Discussion Starter #1 (Edited)
hey everyone, i didn't feel like paying 30+ for a datalogging cable and had some stuff laying around so i decided to make one and figured i could try to save you guys some cash. Feel free to congradulate or critisize, any feedback is appreciated.

You need these drivers to be able to utilize this!
http://www.ftdichip.com/Drivers/VCP.htm


Tools needed:
Soldering iron
Solder
Wire cutters/strippers
Shrink tube (optional, could use electrical tape)


Cable stuff needed:
USB cable (i used an old apple one)
4 Pin female plug (cut off old computer wires i had)



Step 1: Remove the third wire in the 4 pin female plug and strip the usb chord. Slide large piece of shrink tube over usb wire.


Step 2: Cut green wire off of USB as that wire will not be used. strip both USB and 4 pin female plug wires.


Step 3: Twist together White and red wire, solder, shrink tube.


 

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Certified O.G.
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Discussion Starter #2 (Edited)
Step 4: Twist black and red wire together, solder, shrink tube.




Step 5: Twist yellow and black wire together, solder, shrink tube.




Step 6: Slide large piece of shrink tube over all wires and SHRINK! lol.

 

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Discussion Starter #3 (Edited)
The finished product:


Step 7: Plug into ecu with yellow wire facing front plugs and start datalogging :).

 

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Certified O.G.
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Discussion Starter #4 (Edited)
and TADA! hope this helps some of my D brotheren out :)
 

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Discussion Starter #8 (Edited)
how would that work? how do you get device manager to point to that com if its not a rs232 conversion?
rs232 is converting the power (or something along those lines) to something the ecu can read right?

Edit: the +5v is not used with usb(idk if that answers your question).

Another Edit: i was just reading up on xenocron and with this style cable you plug and play, no conversion is necessary.

USB Side: Black (GND), White (RX), Green (+5v Not Used), Red (TX).
ECU Side (CN2 Plug): Pin 1 (GND), Pin 2 (TX), Pin 3 (+5v Not Used), Pin 4 (RX), Pin 5 (Not Used).
 

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Discussion Starter #10 (Edited)
so you have used it and it works?
not personally, i don't own a laptop yet lol. my friend did and he said it worked fine, (so technically i can't say it works i go off his word) just gotta install the drivers at the top and go into device manager set it to the appropriate com port # and change the latency from 16 to 1.
 

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Formally D_Tuned
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This wont work unless the usb plug has a ftdi or some other usb to serial protocol chip inside ( never seen one that did )

The real way this writeup would work is if you showed how to add a 4 pin connector to a usb to serial converter cable.

The ecu's 4 pin cm2 is serial iirc.

Ive been getting into circuit development and all the actuall logistics of how electronics and pic micro-controllers really communicate. And when inspecting both of my datalogging cables from moates they both look to simply be a ftdi usb to serial circuit which really is quite simple if you have the chip.

I will show a few examples later when im not as busy.
 

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Discussion Starter #12
This wont work unless the usb plug has a fdti or some other usb to serial protocol chip inside

The real way this writeup would work is if you showed how to add a 4 pin connector to a usb to serial converter cable.
that bastard (getting in car to go kill friend lol).

well thanks for the insight tw34k, i guess i save people cash on the cable itself lol they still need the usb-serial (or some shit like that) board :(.

damn i thought i stumbled upon something great :( lol
 

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Formally D_Tuned
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Props for trying man, you have the right attitude towards things.

You seem to be into electronics, if you have any interest in learning a little simple coding and circuit dev check out the arduino its a simple pic and breakout board that has some mighty potential in interfacing with almost anything that has wires.

Ill be back later like i said to try and shed some clear light on the datalogging cable situation.
 

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Discussion Starter #14
Props for trying man, you have the right attitude towards things.

You seem to be into electronics, if you have any interest in learning a little simple coding and circuit dev check out the arduino its a simple pic and breakout board that has some mighty potential in interfacing with almost anything that has wires.

Ill be back later like i said to try and shed some clear light on the datalogging cable situation.
thanks buddy :TU:. i try to stay positive no matter what the situation, in this case my friend BS'd me a bit but hell i thought it was cool so i decided to give it a shot. luckily you shed some light on the situation so a bunch of people didn't make this, plug it in and then flame me to death for it not working lol.

yea i love electronics, i build computers here and there (mostly gaming rigs) and i like soldering stuff haha. i'll check that out, might be something i can tweak (not literally) on lol.

cool cool, see ya then :TU:
 

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Well, check this out, I decided to try out CJ's DIY datalogger. I grabbed
a USB cable from an old cell phone I no longer have and a 4 pin plug that
went to an old floppy drive. It took me about 15 minutes and most of that
was the soldering iron not heating up. I didn't do any of the fancy stuff
'cuz this was an experiment.

I used my laptop and Freelog. At first I got nothing with the loopback
test. But then after switching to COM3, I got a positive loopback!
This setup does, in fact, work. However, I wasn't getting any actual
"logging" in the grids..BUT I have to add that I've had problems using
Freelog with Crome 1.53 in the past..So I'm not sure whether it's the
cable another factor that is causing it not to fully log.

Here's the setup -



And here, you can clearly see that I was able to read ECT, RPM and some
other random data -
 

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Discussion Starter #16
Thanks jay! Well glad it at least somewhat worked :TU:
 

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Strange and surprising!

While this may in fact work, a few things tell me it might be troublesome or in fact flat out dangerous. A second thing that alarms me about this is that i have never heard of it before. In this way at least.

I do really plan on posting up some cool things later but i have just been swamped the last few days and id like to include pictures/diagrams with it.
 

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Strange and surprising!

While this may in fact work, a few things tell me it might be troublesome or in fact flat out dangerous. A second thing that alarms me about this is that i have never heard of it before. In this way at least.

I do really plan on posting up some cool things later but i have just been swamped the last few days and id like to include pictures/diagrams with it.
Yes! Do so! I'm a part time electronics geek. Post any and all information.
Hail Zoltan!


Staypuff578 Thanks jay! Well glad it at least somewhat worked
No problem, mang. I'm gonna try it with another program and see what's up.
 

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Totally badass! Ill rep you when it lets me again lol
Thanks a ton for the writeup this is 30 bucks i needed for other stuff :bigok:
 
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