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Old 05-01-2019, 12:21 PM   #276
kopele
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How are you testing with vodka?
I tried submerging the bottom of the sensor in vodka and got strange readings.
Does the fuel need to flow through the sensor for accurate reading?
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Old 05-01-2019, 01:41 PM   #277
HyperBSTI
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Quote:
Originally Posted by kopele View Post
How are you testing with vodka?
I tried submerging the bottom of the sensor in vodka and got strange readings.
Does the fuel need to flow through the sensor for accurate reading?
Just needs to be full. I capped one end and filled it up. The sensor doesn't care if the liquid is moving or not.
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Old 05-01-2019, 04:02 PM   #278
kopele
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Quote:
Originally Posted by HyperBSTI View Post
Just needs to be full. I capped one end and filled it up. The sensor doesn't care if the liquid is moving or not.
Thanks, I'll try testing it at the car like you suggested.
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Old 05-01-2019, 04:51 PM   #279
AFBeefcake
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I built a custom circuit board and found a box to package them in.





all finished
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Old 05-04-2019, 10:29 AM   #280
redrexmeister
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Very nice!

what's the cost of custom cuitcuit board project vs. original setup with Arduino?

I assume to go this route one needs access to specialty equipment?
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Old 05-04-2019, 11:04 AM   #281
AFBeefcake
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Quote:
Originally Posted by redrexmeister View Post
Very nice!

what's the cost of custom cuitcuit board project vs. original setup with Arduino?

I assume to go this route one needs access to specialty equipment?
You still need the Arduino. I just made a board for it to sit on and mount the regulator and resistors to. I allso made a header to connect a LCD screen if I later want to add it. I used a board house to make them.

Here is the back of the board.

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Old 05-06-2019, 09:24 PM   #282
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Is everyone using Ardunio brand boards? or generic?
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Old 05-06-2019, 10:01 PM   #283
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Quote:
Originally Posted by Jakek969 View Post
Is everyone using Ardunio brand boards? or generic?
I'm using a knock off. It' snot in the car yet, as the car isn't on the road. However, everything is programmed the same.
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Old 05-17-2019, 02:01 PM   #284
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I'm not sure what I'm doing wrong, but I cannot get any meaningful output.
I have the arduino plugged into a laptop and the flex fuel sensor connected to the car
battery. I have a counter set to increment inside the TIMER1_CAPT_vect ISR.
The counter stays at 0, so it looks like the event never triggers.
I have continuity from the sensor input to pit 8, 4.66K resistance between the sensor input and the +5V pin, and 4.47K resistance between pin 8 and +5V pin.
I have tried 2 of these sensors: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Any ideas?
Thanks for the help!


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Old 05-17-2019, 02:33 PM   #285
HyperBSTI
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Quote:
Originally Posted by kopele View Post
I'm not sure what I'm doing wrong, but I cannot get any meaningful output.
I have the arduino plugged into a laptop and the flex fuel sensor connected to the car
battery. I have a counter set to increment inside the TIMER1_CAPT_vect ISR.
The counter stays at 0, so it looks like the event never triggers.
I have continuity from the sensor input to pit 8, 4.66K resistance between the sensor input and the +5V pin, and 4.47K resistance between pin 8 and +5V pin.
I have tried 2 of these sensors: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Any ideas?
Thanks for the help!
Are you grounding the arduino to the car as well? Wire from the USB to a chassis bolt or back to the battery negative.
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Old 05-17-2019, 02:44 PM   #286
kopele
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Quote:
Originally Posted by HyperBSTI View Post
Are you grounding the arduino to the car as well? Wire from the USB to a chassis bolt or back to the battery negative.
I'll try grounding the arduino, I thought it was grounded via the USB.
Thanks for the suggestion.
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Old 05-17-2019, 04:52 PM   #287
kopele
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Quote:
Originally Posted by HyperBSTI View Post
Are you grounding the arduino to the car as well? Wire from the USB to a chassis bolt or back to the battery negative.
I got better results by grounding the arduino to the car battery.
It does seem that fuel needs to be flowing through this sensor to get an output.
When I just fill the tube and let it sit the frequency goes to 170Hz instantly and doesn't change.
When I try pouring vodka through the sensor I get frequencies within range, but I cannot get a stable reading, probably because I cannot get a steady flow through the sensor.
I'm just guessing at this point.
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Old 05-27-2019, 06:10 PM   #288
kopele
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Quote:
Originally Posted by kopele View Post
I got better results by grounding the arduino to the car battery.
It does seem that fuel needs to be flowing through this sensor to get an output.
When I just fill the tube and let it sit the frequency goes to 170Hz instantly and doesn't change.
When I try pouring vodka through the sensor I get frequencies within range, but I cannot get a stable reading, probably because I cannot get a steady flow through the sensor.
I'm just guessing at this point.
I put the sensor on the car and got a good stable reading. I wired the read O2 sensor connectors and I get 12V, but only when the O2 sensor is disconnected. As soon as I connect it I lose power on the additional wires.
Any thoughts on this?
Thanks again for all of your help!

Edit: Looking at the Cobb kit pictures it looks like I've wired the wrong pins, I'll try to redo it.


Last edited by kopele; 05-27-2019 at 09:00 PM.
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Old 05-29-2019, 06:52 PM   #289
zcivic
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I was wondering if anyone has been able to make an external display work with this
like this:
https://www.ebay.com/itm/0-91-128x32...72.m2749.l2649

Currently Cobb doesn't offer flex fuel for my 04 FXT but I still would like to try to get this set up and working in case they do.

I have the code for it but I can't figure out how to add it to the code in the first post.
If I overlooked it in this post already I'm sorry. I also did find a set up on Audizine but its not using the NANO and its also using a different OLED screen, its square.
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Old 05-29-2019, 08:18 PM   #290
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Quote:
Originally Posted by zcivic View Post
I was wondering if anyone has been able to make an external display work with this
like this:
https://www.ebay.com/itm/0-91-128x32...72.m2749.l2649

Currently Cobb doesn't offer flex fuel for my 04 FXT but I still would like to try to get this set up and working in case they do.

I have the code for it but I can't figure out how to add it to the code in the first post.
If I overlooked it in this post already I'm sorry. I also did find a set up on Audizine but its not using the NANO and its also using a different OLED screen, its square.
I'm using a different screen. I posted the code I'm using in this thread. Not sure the page.
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Old 05-29-2019, 09:54 PM   #291
zcivic
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Found it on page 8. I copied and saved that code just in case. I noticed it has the dimensions written in the code not sure if changing that is all I need to do or not but once I get parts in I'll get more into it, or if someone smarter then me can dumb it down on what I need to code for the one I ordered.
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Old 05-29-2019, 11:10 PM   #292
fbi
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Yeah, just post up when you're having issues.

B
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Old 05-31-2019, 12:41 PM   #293
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How many of you guys are successfully running this flex fuel sensor on your car?

My tuner is recommending against me doing this and recommending I go with Cobb instead. I was told that the Cobb sensor is much more than a 0-5v sensor and that it has proprietary software and failsafes built in.

Anyone have any insight on this? I don't want to lose my dyno deposit if the sensor doesn't work right.
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Old 06-02-2019, 01:06 PM   #294
kopele
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Got everything wired up in the car and still struggling to get it working. The frequency is bouncing all over the place and I cannot get a stable reading, like before. It seems to be wired ok when I check with a multimeter. I'm tempted to try a different kind of sensor.
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Old 06-02-2019, 06:00 PM   #295
kopele
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Quote:
Originally Posted by kopele View Post
Got everything wired up in the car and still struggling to get it working. The frequency is bouncing all over the place and I cannot get a stable reading, like before. It seems to be wired ok when I check with a multimeter. I'm tempted to try a different kind of sensor.
When the arduino is powered by USB (and common ground connected) everything works fine, but when the external power is connected the input goes nuts. Is 8V too much for the nano or is the 12V input wire causing interference by being too close to the 5V output pin? I don't see any fluctuation when I measure the voltage, so I think I'll try a 5V regulator instead of the 8V.
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Old 06-02-2019, 10:50 PM   #296
fbi
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Definitely check the voltage. Some Arduino can handle 12v, some cannot. Test it after your regulator, and monitor?

Quote:
Originally Posted by kopele View Post
When the arduino is powered by USB (and common ground connected) everything works fine, but when the external power is connected the input goes nuts. Is 8V too much for the nano or is the 12V input wire causing interference by being too close to the 5V output pin? I don't see any fluctuation when I measure the voltage, so I think I'll try a 5V regulator instead of the 8V.
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Old 06-04-2019, 06:53 PM   #297
kopele
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Quote:
Originally Posted by fbi View Post
Definitely check the voltage. Some Arduino can handle 12v, some cannot. Test it after your regulator, and monitor?
The 5V regulator didn't help. The nano is supposed to support 5V-20V 6V-12V unregulated on the Vin pin because it has an internal regulator. I tried direct 12V with the same result. Voltage on other pins was consistent with the board being powered with USB. I think I'll try a nano from a different place.

Last edited by kopele; 06-07-2019 at 04:07 PM.
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Old 06-07-2019, 04:12 PM   #298
kopele
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Well I'm not sure what the issue is, but I can power it on the +5V pin with the 5V regulator and it works fine, so that's what I'll do. Thanks again for the help!
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Old 06-13-2019, 04:13 PM   #299
pearson222
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Quote:
Originally Posted by AFBeefcake View Post
I built a custom circuit board and found a box to package them in.
Nice work! Any chance you could share a link to where you purchased that enclosure/box?
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