IMPLEMENTED SO FAR

- Support for 4x20 LCD Display and large number display
- Brightness and contrast adjustment with remote
- (OPUS/Wolfson WM8741) DAC volume control: remote and rotary encoder
- (OPUS/Wolfson WM8741) DAC random filter selection 1 to 5 with remote
- (OPUS/Wolfson WM8741) DAC upsampling selection (L, M, H -this is the OSR setting)
- I2C level shifting (5V to 3.3V)
- Optimized power-up sequence

Friday, March 20, 2009

Which LCD?

The "standard" LCD is the one based on the Hitachi HD44780 interface. This is a parallel interface and you need at least 7 wires to communicate with the LCD. That's too many wires.

A new crop of LCDs are serial LCDs. Besides power, you only need two wires to communicate.

Several companies/individuals have developed low cost serial interface board for parallel LCDs. For example, you can buy serial LCD controllers from:My favorite is the 4x20 LCD from Web4robot because it supports I2C, it is priced right and there is a fine gentleman developing a library for this LCD (and also for other LCDs). As a bonus, this LCD also supports a 4x4 matrix keypad. See sidebar for links.


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