Article
LEDitron Scoreboard
With discrete 7 segment displays
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.
Materials
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.
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
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]
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]
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