Article

Running Text Display

A 10-character display for the Elektor Flash Micro board

This peripheral circuit for the 89S8252 Flash Board provides a largeformat, 10-character running-text display using dot-matrix modules.The subject of this article may sound familiar. Haven’t we already devoted enough attention to running-text displays? The answer is, yes and no! In the ‘Modular Dot Matrix Display’ (Elektor Electronics, June 2001), the text to be displayed is passed from a PC to an 89S8252 microcontroller using an RS232 interface. In that design, the task of the microcontroller is to convert the characters into bit patterns for the matrix modules and manage the multiplexed drive signals for the display modules.

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Materials

020407-PCB.pdf

020407-11.zip

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.

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The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.

PCB

Download Gerber file: 020407-1.zip

Component list

Resistors:
R1,R6,R7,R12-R15 = 4k?7
R2,R3,R8-R11 = 470?
R4 = 6k?8
R5 = 360?
R16-R23 = 1k?
R24-R31 = 47?
R32 = 100k?
Capacitors:
C1,C3-C10 = 100nF
C2 = 0.1F 5.5V Goldcap (Panasonic NF)
C11 = 10µF 63V radial
Semiconductors:
D1 = LED, yellow, low current, 5mm
D2,D4,D6,D8 = LED, red, low current, 5mm
D3,D5,D7,D9 = LED, green, low current, 5mm
IC1-IC8 = 74HCT164
IC9-IC16 = ULN2803A
IC17 = 74HCT40105
IC18 = DS1302 (Dallas)
T1 = BS170
T2-T11 = BC557B
Miscellaneous:
JP1 = 3-way SIL pinheader with jumper
JP2,JP3 = 2-way SIL pinheader with jumper
K1 = 6-way mini-DIN socket, PCB mount (PS/2)
K2,K3 = 8-way SIL pinheader
K4 = 34-way SIL pinheader
LD1-LD12 = 5x8 dot matrix display with common cathode, size 60.8×38 mm, Kingbright type TC24-11EWA
AT89S8252-24PC for 89S8252 Flash Micro board (010208), programmed
Disk, contains controller program (source and hex), order code 020407-11 or Free Download
PCB, order code 020407-1 (see Readers Services page)