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Old 11-15-2017, 01:41 PM   #151
Barge
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I don't have a schematic electronically to send right now and I'm out of town.

My major difference was a put a self-resetting fuse on the power and I also did an RC filter on the analog output as I believe it will end up being a better signal.

I'll draw something up when I get back home next week.

The wire sleeve I believe I bought from Mcmaster. It's just braided sleeve that I heatshrink on the ends. McMaster has tons of different sizes and materials.
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Old 11-17-2017, 01:13 PM   #152
Sti831
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any idea why the nano wont put out 5v out of the 5v pin? Im only getting about 4.6v out and thats with it connected directly to the battery.. its the v3 so it can handle the 12v.. im confused as to what im doing wrong lol. Since the output pin 11 after the resistor is putting out a higher ethanol voltage. Around 4v, yet the serial monitor says its reading it as e80 at 3.70v, but i tested the E with a tester before filling io my tank and it was around e87-e90 so im lost. Any help would be appreciated
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Old 11-17-2017, 03:34 PM   #153
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Quote:
Originally Posted by Sti831 View Post
any idea why the nano wont put out 5v out of the 5v pin? Im only getting about 4.6v out and thats with it connected directly to the battery.. its the v3 so it can handle the 12v.. im confused as to what im doing wrong lol. Since the output pin 11 after the resistor is putting out a higher ethanol voltage. Around 4v, yet the serial monitor says its reading it as e80 at 3.70v, but i tested the E with a tester before filling io my tank and it was around e87-e90 so im lost. Any help would be appreciated
What's the voltage at the Vin?
The supply voltage has to be at least 7 or 9v (can't remember the min) or the 5v will sag which will skew the output because the output isn't 0-5 it's 0 to whatever is on the 5v pin.

This is one reason I wanted to power it off the tgv 5v (which powers a pressure transmitter OK... Not sure why people had issues with it not power the tgv. I need to drive and log this). Since that's problematic I would prefer to either stabilize the 12v and make it robust or just bypass the internal voltage regulator with some more robust and precise for automotive use.

If you're using my code you can set the one voltage parameter to 4.6v and it should change the scaling... However I'd be a little concerned about sagging 0.4v

4 * (4.6/5) = 3.68 which is what you're seeing.

Either adjust the fudge factor voltage ref setting...or figure out why you're not getting 5v.
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Old 11-17-2017, 06:38 PM   #154
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This would be sweet if it weren’t for noobs
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Old 11-17-2017, 07:55 PM   #155
pearson222
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Does anybody have a version of this working with the 16x2 LCD on the nano? If so could you share your sketch and schematic with me? I could help get an easy to follow DIY together after I get mine put together and operational.
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Old 11-18-2017, 12:11 AM   #156
Sti831
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Quote:
Originally Posted by Barge View Post
What's the voltage at the Vin?
The supply voltage has to be at least 7 or 9v (can't remember the min) or the 5v will sag which will skew the output because the output isn't 0-5 it's 0 to whatever is on the 5v pin.

This is one reason I wanted to power it off the tgv 5v (which powers a pressure transmitter OK... Not sure why people had issues with it not power the tgv. I need to drive and log this). Since that's problematic I would prefer to either stabilize the 12v and make it robust or just bypass the internal voltage regulator with some more robust and precise for automotive use.

If you're using my code you can set the one voltage parameter to 4.6v and it should change the scaling... However I'd be a little concerned about sagging 0.4v

4 * (4.6/5) = 3.68 which is what you're seeing.

Either adjust the fudge factor voltage ref setting...or figure out why you're not getting 5v.

Its getting about 12.5v on the v in directly from my cars battery.... im starting to think that it just might be a bad board or something. Gonna order a couple more and test them out.
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Old 11-18-2017, 12:50 AM   #157
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Quote:
Originally Posted by Sti831 View Post
Its getting about 12.5v on the v in directly from my cars battery.... im starting to think that it just might be a bad board or something. Gonna order a couple more and test them out.
Did you get a "legit" one or generic copy board?
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Old 11-18-2017, 01:55 AM   #158
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Quote:
Originally Posted by Sti831 View Post
Its getting about 12.5v on the v in directly from my cars battery.... im starting to think that it just might be a bad board or something. Gonna order a couple more and test them out.
While Arduinos CAN handle that high of a voltage for a little while, it's highly recommended that your input voltage be in the 7-9v range. The onboard voltage regulator can't handle 12v for long.
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Old 11-18-2017, 06:40 PM   #159
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Quote:
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Did you get a "legit" one or generic copy board?
Im pretty sure its a generic one now. Got it from ebay since the official site says they're sold out
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Old 11-18-2017, 06:41 PM   #160
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Quote:
Originally Posted by SurfGuruJeff View Post
While Arduinos CAN handle that high of a voltage for a little while, it's highly recommended that your input voltage be in the 7-9v range. The onboard voltage regulator can't handle 12v for long.
Thanks for the tip. Just ordered some 9v regulators lol 1.5A okay? Only ones i found.
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Old 11-30-2017, 01:58 AM   #161
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The rear O2 sensor provides power for the arduino, but how are you guys powering the ECA? I am thinking of tapping the O2 power/ground at the nano before it gets to the VR. I would prefer to have all the wires from each connector going straight to my enclosure rather than having to split the power and signal cables.
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Old 11-30-2017, 05:42 PM   #162
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Quote:
Originally Posted by pearson222 View Post
The rear O2 sensor provides power for the arduino, but how are you guys powering the ECA? I am thinking of tapping the O2 power/ground at the nano before it gets to the VR. I would prefer to have all the wires from each connector going straight to my enclosure rather than having to split the power and signal cables.
The ECA and Arduino can be powered from the same power source, hence the need for the voltage regulator. The 12V from the O2 will power the ECA just fine, but the arduino needs it to be stepped down to use it safely. Alternatively, you could use another power source to independently power the ECA or Arduino.
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Old 12-06-2017, 11:03 PM   #163
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So quick update. I got the 9v 1.5A regulator in and soldered it on. The 5v pin reads 5v when the ECA isn't connected. But as soon as i connect it, it sags a bit to 4.98.. is that fine or am i still doing something wrong? Lol also it still reads the same ethanol content as before (e81).. sometimes when i open the switch and the fuel primes up after sitting for a while, it'll spike up to e87 and then drop down to e81 again.. so i removed the ECA to do some bench testing.. straight 93 from shell read at 12% ethanol.. 50-50 mix in a bowl read at 51% ethanol. And then straight E read at 81%... also its winter here in south texas so idk if that affects the ethanol. The only reason i feel like its off is because of the same readings when running straight E. its always at 80 or 81 but i have been pumping at the same station so idk

Last edited by Sti831; 12-06-2017 at 11:06 PM. Reason: Add more info
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Old 12-07-2017, 09:16 AM   #164
Barge
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Quote:
Originally Posted by Sti831 View Post
So quick update. I got the 9v 1.5A regulator in and soldered it on. The 5v pin reads 5v when the ECA isn't connected. But as soon as i connect it, it sags a bit to 4.98.. is that fine or am i still doing something wrong? Lol also it still reads the same ethanol content as before (e81).. sometimes when i open the switch and the fuel primes up after sitting for a while, it'll spike up to e87 and then drop down to e81 again.. so i removed the ECA to do some bench testing.. straight 93 from shell read at 12% ethanol.. 50-50 mix in a bowl read at 51% ethanol. And then straight E read at 81%... also its winter here in south texas so idk if that affects the ethanol. The only reason i feel like its off is because of the same readings when running straight E. its always at 80 or 81 but i have been pumping at the same station so idk
Seems odd that the ECA causes it to sag since all that does is supply an input to the Arduino.

I don't really expect it to ever be 100% dead on as long as it's consistent that's the number one thing. With the resolution of the analog output you will tend to get some odd readings at break points.

If you normally read 12 and 81 I'd scale your blend tables from say like 15-80.. that way it's not messing up your base gas tune tables.

Winter here in MI e85 will be down to probably e60 lots of places.
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