Version 15 (modified by volker, 12 years ago) (diff)

power consuption for USB version


Cwlinux offers two LCD kits:


a 16x2 text display with either serial or USB interface:

Front View:

Serial Version:

USB Version:


A graphics display (122x32 pixels, 20x4 characters) again with either serial or USB interface.

Serial Version:

USB Version:

The USB version uses an USB to serial converter from Prolific (PL2303) with VendorID 0x067b and ProductID 0x2303. The Linux Kernel 2.6 support this with the module pl2303. It demands 500mA, so you need an active powered USB port.

The really cool fact with their displays is that the whole thing is mounted into a half-height 5 1/4 drive bay:

Character LCD with Keypad:

Graphic LCD:

Graphic LCD with Keypad:

... or white:

Display Section

Display <name> {
    Driver     'Cwlinux'
    Model      <string>
    Port       <string>
    Speed      <number>
    Brightness <number>
    Icons      <number>


Model'CW1602' or 'CW12232'
Portserial device the display is attached to (e.g.'/dev/ttyS2')
Speedthe baud rate from the display must match this value. Possible values are 1200, 2400, 9600 and 19200
Brightnessinitial backlight brightness, 0..8
Iconsnumber of user-defined chars reserved for icons (default: 0)


The driver provides the following functions (depends on the display model):

LCD::brightness()return current brightness setting
LCD::brightness(n)set brightness to n (0..8)

Keypad support

The keypad is supported in lcd4linux-0.10.1-RC1.


Display CW12232 {
    Driver 'Cwlinux'
    Model 'CW12232'
    Port '/dev/ttyUSB0'
    Speed 19200
    Brightness 2
    Icons 1
Widget keyConfirm {
    class 'Keypad'
    position 'confirm'
    state 'pressed'
    expression LCD::brightness(4)

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