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HOWTO: 8 Channel Analog Input Datalogging


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To log up to 8 analog inputs (or 16 with a different cable) you can use the following analog input cable from DigiKey. It is approximately $45 + delivery. Free delivery if you spend over $60.

https://www.digikey.com.au/product-detail/en/DLP-IO8-G/813-1010-ND/1894342/?itemSeq=286026595

The driver is already included in the PCMTEC Editor installer so no extra software is needed. They do have a package on their website to test the cable separately to our software if you want which can be downloaded here.

https://www.dlpdesign.com/usb/io8.shtml

Next plug the cable in and press the DLP button in the datalogging screen to connect to the cable. You can then select the DLP inputs from here:

 

Next select which of the 8 analog inputs you would like to log here:

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To

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To change the description/units press F2 to enter Edit mode, then click in the Units field and type the new Units

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Note: Unit Edit - Version 2.0 onwards only

To modify the voltage lookup table right click and pick "Equation"

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You can enter in a new voltage lookup table here to suit your wideband etc. 5v = 5120 and 1v = 1024.  Eg 1024 * voltage = A/D count

If you have data from your wideband documentation that for example specified 1.2 lambda at 4.5v and 0.55 lambda at 1v you would enter the data as follows:

1v *1024 = 1024 A/D

4.5v * 1024 = 4608 A/D

So your table will be:

0, 0.55

1024; 0.55

4608; 1.2

5120; 1.2

..repeat

5120; 1.2

This will clamp your lambda reading between 0.55 and 1.2 lambda.

Display Range

To adjust the display range, right click on the scalar and Adjust Range (or right click on the chart scales)

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You can then see the adjusted range in the chart

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To wire up your DLP cable you can read the data sheet here or follow our test pictures below.

http://www.dlpdesign.com/usb/dlp-io8-ds-v17.pdf

Wiring

If you have 1 wideband, simply wire the ground to the ground pin, wire the postive input to pin 1, next loop the rest of the input pins (2,3,4,5,6,7,8) to ground to stop the signals floating. You don't have to do this, but the inputs will likely read 5v if you don't.

If you have 2 widebands, simply do the same and wire the second sensor to pin 2 and remove the ground loop from pin 2.

Test Harness Wiring

This is two potentiometers wired up to emulate 0-5v sensors. We are utilising the +5V pin that is available on the DLP header.

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Here we have looped the ground pins on input 5-6-7-8-GND to stop the signals floating.

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Here we have wired in "sensors" 1 and 2 into pins 1 and 2. We also looped them to pins 3 and 4 to duplicate the signal.

 

image.png

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  • 3 months later...
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On 5/3/2020 at 4:38 PM, DanStraffa said:

Have you done an equation for an AFR gauge? Or all AFR gauges are different?

I just set up my techedge and it was straight forward. 0V = 9 afr and 5V = 19 afr.

With the equation, I literally put a 9 and a 19 in the first and second cells respectively in the right column and it was done. It will interpolate between the first 2 vertical cells so there is no need to use the entire column.

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Is it possible to use the 20 Chanel version?
https://www.digikey.com.au/product-detail/en/dlp-design-inc/DLP-IO20/813-1027-ND/2135093

Is there a limit in the software as to how many aux analog channels can be logged?

thanks

jake. 

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21 minutes ago, Roland@pcmtec said:

There is an arbitrary limit of 8 at the moment, only because no one has logged more than 1 input to date. 

No dramas, I’m a little way of having all my instrumentation finished (need isolation cash😉)so 8 will do for a bit.
thanks,

jake. 

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Almost every wideband is going to output a 0 to 5 volt signal. Usually it is on a spare wire that isn't connected to the wb gauge. You connect this wire to the DLP8, which in turn is connected to your computer via USB. You can configure PCMTec to output a data channel based on whatever signal the DLP8 is seeing.

So it goes; wideband=>DLP=>USB/PCMTec

The first post in the thread shows you how to set it up.

Have a read of this for what the DLP8 can do and how it works: https://www.dlpdesign.com/usb/dlp-io8-ds-v17.pdf

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13 hours ago, Stevenbruzz said:

Does the software allow the ability for serial port data input? I have a AEM Wideband with serial out just want to know if the software will detect it

It is on the list for one day, however we don't get many requests for it so the priority is quite low. Unlikely to happen before mid next year.

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This isn’t to do with what you are after I think @Puffwagon but I found if you want to change the units of what you are datalogging make a datalog save it, open it, play it, and pause it then you can change the units and it’ll change it when you datalog again.

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Alrighty I tried that and after a few clicks of start and pause and then pressing F2, the log disappeared and then nothing would happen.

I reloaded a log and F2 is doing nothing again. I know I have my moments but surely I can't be so daft as to not be able to follow simple instructions?!

Edited by Puffwagon
Why not?
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4 hours ago, yoda598 said:

Mine isn't happy.

 

You might have to reinstall the drivers for the dlp8 cos mine wouldn't connect until I did that, even though it had been working previously.

Also I'm pretty sure you have to run a wire from the wb- to the wb gnd. At least that is how mine is set up, although it's been freaking ages since I read the techedge instructions.

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20 hours ago, Puffwagon said:

 

You might have to reinstall the drivers for the dlp8 cos mine wouldn't connect until I did that, even though it had been working previously.

 

Shouldn't need any drivers installed for the DLP cable as we embed the usb/serial driver in the pcmtec installer.

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Quote

I reloaded a log and F2 is doing nothing again

Pressing F2 (and then click the parameter) during log playback will not change the names. Just tested 1.25 and looks like rename list items is only available in 2.00 when connected to the DLP in 'live' mode.

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It would be handy to rename items as the afr/dlp8 input is listed as volts for now.

I knew that the drivers are bundled with PCMTec and also in windows, however I was having the fail to connect issue and I resolved it with a driver reinstall.

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