Look at the I2C LiquidCrystal folder in your Libraries folder and look at the spelling of the folder name.
If it is spelled "LiquidCrystal_I2C" it is the wrong library for the display code you are using.
You need fm's library from here :
-liquidcrystal/downloads
When you remove the old library (you can't just rename it) and install fm's library , the new library
folder name will be "LiquidCrystal" , NOT "LiquidCrystal_I2C".
I use both libraries because I have two different I2C displays, one works with fm's library, the other works
with the other one that I believe is the one you have. I have a Temp folder on another drive . When
I need to change libraries, I delete the old one and copy and paste the correct one into the
C:\Program Files\Arduino folder.
I don't know how to get both displays to work with the same library. I don't know if that is even possible.
I do know that the way I deal with it now works every time and takes about 1 minute.
If someone can tell me how to get both displays working with the same library I am all up for that.
Is this the same library you were using before or did you just install it ? (twice)
Try this library.
It should have worked with the V1.2.1 because I only had to use that library if the descriptor had
the word NEGATIVE or POSITIVE. The other lcd doesn't have that in the descriptor.
I'm stumped. How did you install the library ?
Did you make sure to close any open instances of the IDE after changing libraries ?
Have you tried just loading the "hello world" Example using "File\Examples\LiquidCrystal\Examples\Helloworld" ?
These two statements are contradictory.
If you sketch does not compile, how could your display be working ?
Can you please clear up this confusion ?
If the reason for your post is no longer valid, you need to state that. (ie: Sketch is compiling with no
errors using [blank] library and [blank] sketch, (preferably with links so someone else can
test it themselves). Is it displaying "hello world" ?
Are you getting valid text ?
You need to state this explicitly .
What is your current situation ?
The backlight is a separate issue , not related to your post title.
There may be a simple explanation for that.
You should not be using LCD.h. That lib is bogus.
The example at the link you gave me does NOT have "include LCD.h"
You should be using LiquidCrystal.h
MY BAD.
I actually forgot to mention that the library I suggested is another one you could
try but it happens to be a library that is NOT compatible with the GUESSER.
I forgot to mention try the guesser first and then the other one.
You can get "fm's" library from here:
-liquidcrystal/downloads
THIS is the library that works with the GUESSER.
BTW, you used the wrong button to post your code.
You used the "QUOTE" button instead of the CODE [#] button, that's why I can't scroll through
your code. The [#] code button is the one that creates a scroll window.
It is also usefull for really long quotes.
I did a test compile of your code using fm's library and got PAST the lcd descriptor.
The only compiler errors were for the dht11 humidity sensor library which I don't have installed (and never heard of
till now). After commenting out the dht11 code lines the sketch compiled.
I don't think that is good news..
The only way to get this error is that fm's library is not properly installed.
It could be that some other library is being used instead
OR
It could be that the header file LiquidCrystal_I2C.h is not being found.
raschemmel,
I would recommend not attaching libraries to the forum posts.
Use links instead. Preferably a link to a download page were the library is
rather than a link to the download image itself. That way old stale and perhaps broken libraries don't
get left around in forum posts for unsuspecting users to stumble on again
in the future.
And if a newer version is available, the link provided can help users find it.
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