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20x4 Serial LCD Module

20x4 serial LCD module supporting RS232, TTL and I2C data

  • Software-controlled, variable backlight
  • Asynchronous serial,
    RS232 & TTL
  • Synchronous serial I2C
  • 80-character buffer
  • 4 line, 20 character display
The melabs 20x4 Serial LCD Module can display serial data from either an asynchronous RS232-style input or a synchronous I2C input. A range of baud rates from 2400 to 57,600 are available and the serial data is buffered so that no delay is necessary when transmitting data to the module.

The display includes an LED backlight with variable brightness. The serial LCD board is also available separately for use with other displays that utilize a Hitachi HD44780 or equivalent controller IC.

  • Software-controlled, variable backlight (Off to Full Brightness in 256 steps).
  • Asynchronous serial supported at baud rates of 2400, 9600, 19200, and a blistering 57600. (jumper selectable)
  • Jumper-selectable input inversion for use with either True Mode or Inverted Mode Serial. Connect directly to a PC serial port or to an output pin on a microcontroller.
  • Compatible with both RS-232 (+/- 12V) and TTL (0-5V) levels.
  • Synchronous serial I2C input up to 400K bps.
  • Change I2C slave address via jumpers or with a software command.
  • 80-character buffered communication.
  • User-programmable boot screen memory allows a custom message to be displayed on power up.
  • Use standard commands compatible with Hitachi HD44780 or our easy-to-understand special protocol to control the display
  • Built-in special functions include scroll up, scroll down, set backlight, select line, display bargraph, cursor appearance, change I2C address, save/recall strings.
  • Onboard non-volatile memory allows you to save custom messages and then recall/display them with a short command.
  • Fast bargraph displays (up to the full width of the display) can be anchored on the left side or right side. Fast enough to display stereo audio levels!
  • 5-volt operation with less than 5mA current consumption (backlight off)
  • 4-line display PCB (outside edge) measures 98mm wide and 60mm high

An I2C interface is available on many popular microcontrollers such as the BASIC Stamp BS2P and may be easily implemented on most PIC microcontrollers using either the PicBasic or PicBasic Pro compiler.

More Information

slcdcov110.pdf Serial LCD Quick Start Guide
slcddoc1.pdf Serial LCD Version 1.00 User's Guide
slcddoc110.pdf Serial LCD Version 1.10 User's Guide
hd44780u.pdf Hitachi 44780 LCD Controller Datasheet

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Page Updated:
22/12/09

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Tel: +44 7814 044 754 -  Fax: +44 8715 283 948 -  Skype: warburtech.co.uk

Warburton Technology, 33 Selkirk Close, Wimborne, Dorset, BH21 1TN, United Kingdom

VAT Number: GB 846 917 877

Warburton Technology