Using Arduino IIC / I2C Serial 3.2" LCD 2004 Module Display

[nick12ab]

I don't like to take that risk. It's very hard to remove because there is so many pins on it.

Have you tried contacting the seller to see how to control the backlight?

 

[Pekari]

No.
I think I should to do that in the next week.

 

[hippy]

it doesnt light when that code is working. In start it will flash but go off when program starts.

It sounds like the backlight is controlled by one of the PCF8574 signals. As all but one are being used for LCD control that would suggest IO3. In which case, adding -

Symbol bitBKL = bit11

at the top of the code, and -

bitBKL = 1

in the 'SendB0AsInitByte:' routine should keep it permanently turned on.

 

[jsotola]

i think that hippy is correct

i found some more info at this site
http://elger.org/wiki/projects/lcd_module

there is a code sample on this page, file name: i2c_display.ino

it mentions that the backlight is controlled by bit #3, which indeed translates to bit11 in your setup

note: it may have to be 1 or 0 for it to light, try both

here is the datasheet for the expander chip
http://www.nxp.com/documents/data_sheet/PCF8574.pdf , it is the 16 pin version

 

[Pekari]

Yes, that's right, hippy, now it's lighting!
No big problems anymore.
Thanks again!

And thanks to jstola too, that was an informative page!

I wonder how the cursor etc function could get to work with these PICAXEs?

 

[hippy]

I wonder how the cursor etc function could get to work with these PICAXEs?

Just alter the relevant initialisation byte.

 

[Pekari]

Ok. Thanks, hippy.