For a basic explanation of how libraries work in Arduino read the library page. download 4-bit LCD library, «LCD4Bit», here. Using 4-bit LCD alongside interrupts Source repository I’ve created a googlecode project to maintain the source, at -4bitlcd This does not yet have changes from other contributors. Why? This was an unofficial, unmaintained Arduino library which allowed your Arduino to talk to a HD44780-compatible LCD using only 6 Arduino pins. It was neillzero’s conversion of the code from Heather’s original Arduino LCD tutorial which required 11 Arduino pins.
Once you are sure your display is working, you can move on to use the 4-bit version. Arduino LCD playground | LCD 4-bit library Do not use this library Please note that from Arduino 0016 onwards the official LiquidCrystal library built into the IDE will also work using 6 Arduino Pins in 4 bit mode. It is also faster and less resource hungry, and has more features.
If You can’t search it here, Nowhere else in the world. This LCD4bit library dates from 2006 when the official library only worked in 8 bit mode. It is effectively redundant.
How to use it The library is intended to be a 4-bit replacement for the original LCD tutorial code and is compatible with very little change. You can get the source from svn anonymously over http using this command-line: svn checkout /svn/trunk/ arduino-4bitlcd Modifying the library See this forum post.
Display 16×2 (KS0066 controller, black & white, no back-light, HD44780 code compatible). First line is working, but both lines are greatly dimmed when displayed at the same time (I think it’s a problem in my circuit, not in the library) Hantronix HDM16216L-B display, 16 characters X 2 lines.
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