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technobly / SparkCore-LiquidCrystalSPI

A Hardware and Software SPI version of the LiquidCrystal library for the Spark Core.
GNU General Public License v3.0
9 stars 6 forks source link

Backlight issue #1

Open bevangg opened 9 years ago

bevangg commented 9 years ago

Hi Great library, thanks, but I have got an issue with the backlight not working by default. If I hard wire the lcd backlight pins A and K to the 5 volt and ground lines it works fine but without that there is display but no backlight. Not really a major problem as it works fine but the display cannot be so easily turned off through software. I noticed that some people are directly driving the backlight in the same way and switching it with a mosfet: http://www.ermicro.com/blog/?p=2215 It is definitely a HD44780 unit but I wonder if it might be different to what you have coded for. The fact that it displays Backlight Rave! suggests that there is not much out of sorts here. Best regards

bevangg commented 9 years ago

BTW the backlight circuit in your fritzing could only adjust contrast, originally I imagined it adjusted brightness.