LEDitron Scoreboard

With discrete 7 segment displays

Labs Project

Based on a Labs project | August 2017 | Find it here

Believe it or not, there was a time when hobbyists found 7-segment displays with red LEDs (cutting-edge technology at that time) hard to come by and virtually unaffordable. If you absolutely needed a 7-segment display, you had to make it yourself from cardboard, translucent red film and incandescent lamps.

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Materials

LEDitron

LEDitron Scoreboard

Project Software

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.

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PCB

Download Gerber file: 160205-1V1.4gerbers.zip

Extra info / Update

Scoreboard and timer
Microcontroller driven
LEDitron displays
No SMD components
12 VDC supply voltage

Component list

From the Store
150448-1 LEDitron display PCB (4 required)
150448-71 LEDitron kit including acrylic parts, without filaments (4 required)
160205-1 Scoreboard motherboard PCB
160205-41 Pre-programmed microcontroller

Component List
Display board
R1 = 220Ohm
Semiconductor
LED1 = 5mm
K1 = 10-pin SIL pinheader, angled
PCB # 150448-1
Motherboard
Resistors
Default: 5%, 0.25W
R2,R5,R8,R11,R14,R17,R20,R22,R24,R28,R32,R38,R39,R40,R41,R42 = 4.7kOhm
R23,R25,R29,R33 = 100kOhm
R1,R3,R4,R6,R7,R9,R10,R12,R13,R15,R16,R18,R19,R21,R27,R31,R35,R37 = 1kOhm
R26,R30,R34,R36 = 47kOhm
R43,R45 = 27kOhm
R46,R49 = 2.2kOhm
R47 = 10Ohm
R48 = 390kOhm
R44 = 3.3kOhm
P1 = 4.7kOhm trimpot, horizontal
Capacitors
C1,C2 = 470µF 63V
C3,C5 = 100nF
C4 = 10µF 63V
C6,C7 = 18pF
C8 = 330pF
C9 = 4.7µF 100V
Inductors
L1 = 47µH
Semiconductors
D1 = MUR160G
IC1 = LM78L05
IC2 = ATMega328P, programmed
IC3 = ICM7555

Miscellaneous
X1 = crystal 16MHz
K1 = 2-way PCB screw terminal block, 5mm pitch
K2 = 4-way SIL socket header
K3 = 5-way SIL socket header
K4–K7 = 10-way SIL socket header
K8 = 6-pin (2×3) pinheader
JP1 = 3-pin jumper
S1–S4 = pushbutton switch, NO
[Streamer]

Discussion (0 comments)

Hennie J.A Blanke 7 years ago

Leuke schakeling. Ook een leuke oplossing om met de analoge ingangen selecties te maken. Alleen... zo als de schakeling nu is gekozen, verdient het zeer beslist verbetering. Druk S1 en S3 tegelijkertijd in en je hebt een flagrante kortsluiting gecreëerd. Je mag toch op z'n minst iets van stroombegrenzing verwachten in de vorm van een paar kleine weerstanden.

Dat zal wel invloed hebben op het "schakelniveau" maar je hebt genoeg stappen in je AD conversie om iets anders te doen dan 0, de helft en maximaal. Om te beginnen is lager dan de helft en hoger dan de helft al een duidelijke keuze.

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