[chbot] Blue HD44780 LCDs

[Robin Gilks]

Greetings all

I've only ever used green and yellow HD44780 style character mode LCDs and
they have had a backlight (which draws a LOT of current) but been
perfectly readable without the backlight being on.

I'm now playing with a blue one and the backlight has to be on to read it
- is this normal for blue LCDs ?

I haven't checked the current yet (rebuilding alpha hardware into beta
stage prototype) but I'm guessing its quite low since modern blue LEDs
seem to be very efficient.

Cheers

-- 
Robin Gilks