2 layers99.1 × 99.1 mm
At90s2323
atoomnetmarc/AVR-demo-board
AVR demo boards for old AT90S* microcontrollers.
171 parts4Apache-2.0
4 layers278 × 116.1 mm
6 digit- 7 segment display clock
- Size
- 278 × 116.1 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 94
- Nets
- 137
- Pads
- 394
- Tracks, vias
- 1,061, 0
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 2 Jun 2026
- Updated
- 13 Jun 2026
Overview
Clock is an open-source printed circuit board by MythicalJayden07, from the MythicalJayden07/Clock repository on GitHub. It is a 4-layer board of 278 × 116.1 mm with 94 parts on 137 nets, routed with 1,061 tracks and 0 vias.
It is built around the ATMEGA328P-PU, TPIC6B595N and L7805, with the SA18-11EWA and SA08-11GWA among its other parts. Its parts include 53 resistors, 15 capacitors, 8 ICs, 5 diodes and 4 connectors. It belongs with the lEDs and displays boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
5
ATMEGA328P-PU
DIP-28-300mil-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH DIP-28-300mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
TPIC6B595N
PDIP-20-40℃~+125℃ 1 4.5V~5.5V 8 Asynchronous clear function、Output enable Open-drain Serial-to-Serial or Parallel TPIC PDIP-20 Shift Registers ROHSTexas InstrumentsShift Registers
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
SA18-11EWA
DIP-101 1.75 225mW 56mmx38mmx11.25mm 7 Segment Common Anode Red DIP-10 LED Segment Displays ROHSKingbrightLED Segment Displays
SA08-11GWA
DIP-180.8 1 27.7mmx2mmx8.4mm 62.5mW 7 Segment Common Anode Green DIP-18 LED Segment Displays ROHSKingbrightLED Segment Displays
README
README.md6-Digit 7-Segment Display Clock
This is a custom digital clock featuring a 6-digit 7-segment display packed into a clean, rectangular desktop case. I designed this to blend custom 3D-printed mechanics with a sleek, premium look by keeping the messy electronics hidden and using a real glass front panel.
The Inspiration
I’ve always loved the raw, industrial look of 7-segment displays, but most DIY clocks you see online either look like a total rat's nest of bare wires or they’re stuck inside chunky 3D-printed plastic boxes that just feel a bit cheap. I wanted to make something that actually looks like a premium desktop piece you'd buy at a store, while keeping that precise, retro-tech HH: MM :SS readout. The goal was to have a pristine glass front with zero visible screws or clunky printed bezels, but still have quick, toolless access to the PCB whenever I want to mess with the hardware.
PCB Schematic
The brain of the clock. The schematic handles the multiplexing for the 6-digit display, power management, and the ATmega328P microcontroller layout to ensure clean signal lines without ghosting on the digits.
PCB Layout
A custom, compact board designed to slide perfectly into the case alignment channels. Component placement was adjusted so it sits perfectly behind the front glass face.
CAD Enclosure Design
The rectangular housing featuring the integrated top hinge and embedded slots for the neodymium magnets. This makes the door snap shut tight!!
Bill of Materials (BOM)
| Reference | Qty | Value | Footprint / Details | Part Link |
|---|---|---|---|---|
| U1 | 1 | ATmega328P-P | Package_DIP:DIP-28_W7.62mm Microcontroller | Buy Link |
| U2 - U7 | 6 | TPIC6B595 | Package_DIP:DIP-20_W7.62mm Power Shift Register | Buy Link |
| U8 | 1 | L7805 | Package_TO_SOT_THT:TO-220-3_Vertical Regulator | Buy Link |
| DS1 - DS4 | 4 | SA18-11EWA | 1.8" Kingbright Red 7-Segment Display | Buy Link |
| DS5, DS6 | 2 | SA08-11GWA | 0.8" Kingbright Green 7-Segment Display | Buy Link |
| D1 | 1 | 1N5401 | Diode_THT:D_DO-201AD_Horizontal Rectifier | Buy Link |
| Q1 | 1 | 2N3904 | Package_TO_SOT_THT:TO-92_Inline NPN Transistor | Buy Link |
| F1 | 1 | 2A | Fuse:Fuse_Bourns_MF-RG300 Resettable PTC | Buy Link |
| Y1 | 1 | 16Mhz | Crystal:Crystal_HC49-U_Vertical Oscillator | Buy Link |
| C1 | 1 | 470uf | Capacitor_THT:CP_Radial_D8.0mm 25V Electrolytic | Buy Link |
| C3 | 1 | 100uf | Capacitor_THT:CP_Radial_D8.0mm 25V Electrolytic | Buy Link |
| C2, C4-C12, C15 | 11 | 100n | Capacitor_THT:C_Disc 0.1uF Ceramic Disc | Buy Link |
| C13, C14 | 2 | 22pf | Capacitor_THT:C_Disc 22pF Ceramic Disc | Buy Link |
| D2 - D5 | 4 | LED | LED_THT:LED_D5.0mm Red Status Indicator | Buy Link |
| R1-R7, R9-R15, R17-R23, R26-R32 | 28 | 390R | Resistor_THT:R_Axial 1/4W Carbon Film | (https://robu.in/?s=390+ohm+quarter+watt+resistor&post_type=product) |
| R8, R16, R24, R33, R35-R50 | 20 | 620R | Resistor_THT:R_Axial 1/4W Carbon Film | (https://robu.in/?s=620+ohm+quarter+watt+resistor&post_type=product) |
| R51, R55 | 2 | 1k | Resistor_THT:R_Axial 1/4W Carbon Film | (https://robu.in/?s=1k+ohm+quarter+watt+resistor&post_type=product) |
| R52 | 1 | 270R | Resistor_THT:R_Axial 1/4W Carbon Film | (https://robu.in/?s=270+ohm+quarter+watt+resistor&post_type=product) |
| R53, R54 | 2 | 10k | Resistor_THT:R_Axial 1/4W Carbon Film | (https://robu.in/?s=10k+ohm+quarter+watt+resistor&post_type=product) |
| J1, J4 | 2 | Male Pins | 2.54mm Breakaway Vertical Headers | [Buy Link](https://www.digikey.in/en/products/detail/amphenol-cs-fci/68000-402HLF/1493940?s=N4IgTCBcDaIGwA4AMKC0AWJYASAZAYiALoC%2BQA and https://www.digikey.in/en/products/detail/amphenol-cs-fci/68000-406HLF/1878471?s=N4IgTCBcDaIGwA4AMKC0AWJcASAZAYiALoC%2BQA ) |
| J2, J3 | 2 | Sockets | 2.54mm Vertical Female Pin Sockets | [Buy Link](https://www.digikey.in/en/products/detail/3m/929974-01-04-RK/1094257 and https://www.digikey.in/en/products/detail/3m/929974-01-06-RK/1094259) |
| Case Hardware | 6 | Magnets | N52 Neodymium Disc Magnets (3mm x 2mm) | Buy Link |
| Case Hardware | 1 | Glass Sheet | Custom cut clear front panel window (2mm) |
Parts
94| Qty | Value | Footprint | References |
|---|---|---|---|
| 28 | 390R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R10, R11, R12, R13, R14, R15, R17, R18, R19, R20, R21, R22, R23, R26 +12 |
| 20 | 620R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R16, R24, R33, R35, R36, R37, R38, R39, R40, R41, R42, R43, R44, R45, R46, R47 +4 |
| 11 | 100n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C2, C4, C5, C6, C7, C8, C9, C10, C11, C12, C15 |
| 6 | TPIC6B595 | Package_DIP:DIP-20_W7.62mm | U2, U3, U4, U5, U6, U7 |
| 4 | LED | LED_THT:LED_D5.0mm | D2, D3, D4, D5 |
| 4 | SA18-11EWA | Sa18:My_Big_SA18_Display | DS1, DS2, DS3, DS4 |
| 2 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R53, R54 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R51, R55 |
| 2 | 22pf | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C13, C14 |
| 2 | SA08-11GWA | Clock parts:My_Custom_SA08_Display | DS5, DS6 |
| 1 | 100uf | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C3 |
| 1 | 16Mhz | Crystal:Crystal_HC49-U_Vertical | Y1 |
| 1 | 1N5401 | Diode_THT:D_DO-201AD_P15.24mm_Horizontal | D1 |
| 1 | 270R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R52 |
| 1 | 2A | Fuse:Fuse_Bourns_MF-RG300 | F1 |
| 1 | 2N3904 | Package_TO_SOT_THT:TO-92_Inline | Q1 |
| 1 | 470uf | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C1 |
| 1 | ATmega328P-P | Package_DIP:DIP-28_W7.62mm | U1 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | Conn_01x04_Socket | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J2 |
| 1 | Conn_01x06_Pin | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J4 |
| 1 | Conn_01x06_Socket | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | J3 |
| 1 | L7805 | Package_TO_SOT_THT:TO-220-3_Vertical | U8 |
Questions
How big is the Clock PCB?
It measures 278 × 116.1 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Clock use?
94 parts, built around the ATMEGA328P-PU, TPIC6B595N, L7805 and SA18-11EWA. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Clock KiCad files?
From the MythicalJayden07/Clock repository on GitHub, at the commit this page was made from: the board is PCB/Clock.kicad_pcb and its schematic PCB/Clock.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Clock design in my own project?
Its repository states no licence, so its author keeps all rights: ask MythicalJayden07 before reusing the design.
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