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Running Text Display

A 10-character display for the Elektor Flash Micro board

Running Text Display
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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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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 its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

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)
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