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Old 05-10-2008, 08:38 AM   #31 (permalink)
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Quote:
Originally Posted by dcb View Post
Ok, just a couple q's when you get to them and before I forget them.

You got the LCD from NCK, correct? I don't know if any others would be significantly different or not, and don't want to know just yet.
Yes, its the NCK LCD

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Originally Posted by dcb View Post
Can you run it on just external power (i.e. a wall wart of 9-12 volts DC with a plug that fits and center pin positive, or that 9 volt battery trick)? Don't forget to move the jumper. Does it display correctly connected to just external power?
Yes I've tried powering it up with a plug in power supply. It did the exact same thing.

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Originally Posted by dcb View Post
Have you triple checked the wiring against the diagram? I'm pretty sure the diagram is correct because I used it to swap in the serial board.

What if you disconnect pins 2,3,14,17,18,19? if disconnecting them all helps, is there a combination of pins or a single pin that the problem can be isolated to? Hit reset bewteen pin connection tests so the LCD will reinitialize.
I'll give that a try. I have been double checking the wiring but there is a lot of wires. I'll try to see if I can isolate it.

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Old 05-10-2008, 09:03 AM   #32 (permalink)
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Also, you might try going into the code and changing both references to delay(2) to delay(12) and reverify/upload.

Also maybe try changing:
lcd.print("OpenGauge ");
to
lcd.print("0000000000000000");

just to see what happens.

It might be nothing too, just some strange result of nothing being connected to the board. To test that, modify Trip::mpg so it returns a 0.0 first thing:
double Trip::mpg(){
return 0.0; //add this line for testing display
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Last edited by dcb; 05-10-2008 at 09:08 AM..
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Old 05-10-2008, 12:33 PM   #33 (permalink)
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Quote:
Originally Posted by dcb View Post
It might be nothing too, just some strange result of nothing being connected to the board. To test that, modify Trip::mpg so it returns a 0.0 first thing:
double Trip::mpg(){
return 0.0; //add this line for testing display
That seemed to work. I guess it doesn't like getting no signal at first. Also the zeros before "GA" is blinking back and forth between gibberish and 000.00. Maybe i'll set a <code>return 0.0;</code> there as well.

UPDATE: adding return 0.0; to the Trip::gallons() worked too.

Last edited by larrydag; 05-10-2008 at 12:38 PM..
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Old 05-10-2008, 01:04 PM   #34 (permalink)
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Very Good

I discovered a few things about the floating point situation, basically it's not very good on the microprocessors in general. But I also discovered a 64 bit integer type so I need to make a few updates for the integer oriented math.
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Old 05-10-2008, 03:14 PM   #35 (permalink)
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On my ECU I have pins for Injector #1, #2, #3, and #4. Is it possible that Honda Accords control each injector separately? If so I am going to need to get a reading from each one?
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Old 05-10-2008, 03:46 PM   #36 (permalink)
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Quote:
Originally Posted by larrydag View Post
On my ECU I have pins for Injector #1, #2, #3, and #4. Is it possible that Honda Accords control each injector separately? If so I am going to need to get a reading from each one?
yes,

no, you only need one injector signal.
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Old 05-10-2008, 03:53 PM   #37 (permalink)
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no, you only need one injector signal.
Good answer diesel_john
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Old 05-11-2008, 12:28 PM   #38 (permalink)
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Not sure if this is the right thread for this, but regarding the LCD - is the design locked into the one from the site w/ the freeduino, or will any similar LCD work? I really don't like blue lights in my car (blue is the most difficult color for the human eye to process, and therefore causes glare), and was looking at either a green-backlit LCD like this:

http://cgi.ebay.com/16x2-LCD-Display...QQcmdZViewItem

or even better, one of these with green letters:

http://cgi.ebay.com/ws/eBayISAPI.dll...link:middle:us

The specs seem close:
Display Format
16 char x 2 lines
LCD Driving Method:
1/16 duty, 1/5 Bias
Display Mode:
STN, Positive
Driver IC
KS0066U KS0065B

though the driver is a slightly different chip as compared to the blue LCD's S6A0065 driver.

I don't see why it wouldn't work, though I'm hoping to find out from someone if they know it wouldn't. I'm not too afraid of modifying the code if it needs be done for timing, etc...
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Old 05-11-2008, 12:42 PM   #39 (permalink)
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dcb,
feel free to edit the text file in post#6 as you see fit. I just figured it was easier to find an injector than the ECU. Thought the resistor at the injector wire would be safer since there are several amps. availiable thur the injector. Possibily spraying a continuous stream of fuel into the engine if it were to short out. Or damaging the ECU if it were to receive unfused power.

I am humbled by your effort.

Last edited by diesel_john; 05-11-2008 at 12:48 PM..
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Old 05-11-2008, 12:42 PM   #40 (permalink)
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CMags, It isn't restricted to only one LCD, I was able to get my 4x20 from sparkfun working last night actually without changing the code:


So there is an extremely good chance that you can use other LCDs. It is just that you may be on your own if you are having problems with the non-"official" LCD. It could have a different pinout, different commands, different timings, different voltage requirements, etc. etc. and I don't know who here wants to mess with it. If your lcd does behave differently than the "official" lcd, and you are the only one who has that model that is having the problem, then no-one will be able to reproduce your problem.

John, will take a look at it. I think I'm having issues with my ecu setup and may be going straight to the injector myself. It would be nice to have a "one size fits most" routine for hookup.

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