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These displays are straightforward to use and are a great way to provide a user interface on many projects where you need more info than simple LED indicators or 7-Segment displays
The LCD2004 20×4 Blue LCD Display provides a 20-character x 4-line LCD with a parallel interface for control by a uC.
These displays are straightforward to use and are a great way to provide a user interface on many projects where you need more info than simple LED indicators or 7-Segment displays can provide since these are full alphanumeric displays with 4 lines of 20 characters each for a total of 80 characters which is a fair amount of info.
For an interactive display, pairing this type of display with a rotary encoder to navigate and select menu items on display can provide a very nice user interface.
This display incorporates a parallel interface that can operate using an 8-bit (byte) mode or a 4-bit (nibble) mode. The 8-bit mode uses data pins D0-D7, and the 4-bit mode uses the upper data pins D4-D7.
In practice, the 4-bit mode is normally used as it saves 4 pins on the MCU and maximizing communication speeds with the display is generally not a concern. The LiquidCrystal.h library makes the difference between using the two modes transparent to the user.
If it is desirable to minimize the pins used on the MCU even further, check out the version with an I2C interface below, which uses only 2 pins plus power and ground.
Mostly Arduino stuff: Based Character LCDs
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|Dimensions||9.85 × 6.5 × 1.5 cm|
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