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Windows-Treiberpaket - Till Harbaum (libusb0) LibUsbDevices (03/20/2007 is a Shareware software in the category Miscellaneous developed by Till Harbaum.
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Windows-Treiberpaket - Till Harbaum (libusb0) LibUsbDevices (03/20/2007 runs on the following operating systems: Windows.
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The LEDMATRIX interface
News: Now with lcd4linux driver
I recently purchased 10 SLM1608 (SLM1606) LED matrix display unitsfrom Ebay (you might also contact the seller directly atop16@gmx.de). These are 16x16 LED matrix units with a green and ared LED per pixel allowing each pixel to be switched to either green,red, amber or off. The goal of this LEDMATRIX project was to build a80x32 pixel display by arranging the displays in two rows with 5displays each giving a total of 16*16*2*2*5 = 5120 LEDs to becontrolled individually.
Fortunately these displays come with interated controllers and thedata can be shifted into a single display using as few as 6 digitalsignals. By multiplexing some of the select signals all 10 displayscan be controlled with a total of ten wires. Using a cheap ATmega32 microcontroller all ten displays can easily be controlledand updated in real time.
This kind of display is usually controlled via RS232. This has thedisadvantage of being very slow and the display data is limited tosimple text messages only with the microcontroller of the displaydoing the actual text drawing. Instead of doing it the same way idecided to use an ethernet interface for the LEDMATRIX display. Eventhe most simple ethernet interface i am using is fast enough totransfer graphics data in realtime from a PC to the display allowingto update the entire screen 50 times a second. The ethernet support ofLEDMATRIX is based on the cirruslogic cs8900 chip which is e.g. supported by the free Procyon AVRlib which has been used for this project.
The LEDMATRIX additionally includes a simple speaker allowing toe.g. notify the user of a new message being displayed. Furthermore aTSOP1736 IR receiver can optionally be connected. This device receivesand decodes the IR signals used by ordinary TV remote controls. Byreturning informtion about received IR signals to the controlling PC,the displays contents may e.g. be remotely changed using a simplespare IR remote control.
This whole project is open under the GPL. This means that youget full access to the firmware source code as well as to the schematics and the PC companion software.
Impressions
After startup the display shows the LEDMATRIX splash screen withthe firmware version number and the current IP address.
Once the PC is accessing the display any data can be displayed like e.g. a long transparent scroll text with some static small redhearts in the background.
Schematics
Click for larger image ...Assembly
The entire device could easily be built with standard wiredcomponents ... if there wasn't the cs8900 ethernet controller which isavailable in SMD technology only. Fortunately, some companies sellthis chip ready to use on a simple pcb like e.g. this one (search for a device calledeasyToWeb-CS8900-16bit). This isn't the cheapest solution but itallows the entire device to be built manually.
I mounted the ten displays in two rows with five displays each. Thefive displays of one row share the main control signals (red,green, bright, clock and reset)while the five columns share the select signal. Both rows haveseperate red and green signals. This way i can update both displays ina column at once and one column after the other. See the image belowfor the wiring on the real thing.
The image below shows the wiring diagram. See the schematic fordetails on the three connectors (row0, row1 and column). Three signals (bright, reset and clock) are present on both the row0 androw1 connectors and are distributed to all 10 displays at once. The red and green pixel data are driven by seperate signals(red0/red1 and green0/green1)on row0 and row1.
The five columns are connected to the columns connector.Only one column can be selected for update at a time.
Power supply
Once of the 16x16 displays draws about 2 A if all LEDs are switchedto amber. My application does not reach the limit of 3.2 A specified for the displays, since during the display update times the displaysare switched off. The resulting image still is very bright and clear.
With one display drawing 2A @ 5V, the power supply of the LEDMATRIXneeds to source all ten displays and thus needs to be able to providea total current of 20A. You might be able to find a cheap old PC powersupply that delivers 20A on the 5V line. I am using a Lambda UAZ1G 30A power supply. I made some small modifications tothe device. I e.g. replaced the noisy small fan with a very quiet 70mmone. There's much unused space in this power supply so the fan caneasily be replaced with a bigger one and e.g. adding a power switchand a connector for a standard power supply cable isn't a problem.Even with the fan completely switched off and with the display at fullamber brightness (all 5120 LEDs switched on) the power supply barelygets warm ...
Software
The LEDMATRIX software consists of two parts: the firmware and anetwork client application for the PC. The firmware provides the basichardware functionality while the pc application calculates the actualimages to be displayed. Even the most complex animations can be donethis way since all image processing is taking place on the PC. Theentire display can be updated 50 times a second from the PC allowinge.g. for smooth scrolling.
The PC client application is available for linux and for windows.Binaries for both operating systems are included in the archivebelow.
If you use Linux you can use the LEDMATRIX to display systeminformation and the like just by using the LEDMATRIXdriver for lcd4linux.
Downloads
- ledmatrix-2006-07-28.zip
- DHCP should now work.
- ledmatrix-2006-06-12.zip
- Disabled DHCP client due to problems reported by auser. The device is now using the static address 192.168.1.111.This will be investigated further.
- The windows img2dsp.exe tool now uses Cygwin and now actually works.
- ledmatrix-2006-05-06.zip
- Initial version
Links
- LCD4LINUXincludes support for the LEDMATRIX
- Email of display seller: op16@gmx.de
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