2 layers104.1 × 70 mm
2 layers159.5 × 53.3 mm
Belshazzar Night Clock
- Size
- 159.5 × 53.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 77
- Nets
- 100
- Pads
- 258
- Tracks, vias
- 403, 43
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 20 Jun 2024
- Updated
- 8 Jan 2025
Overview
BClock is an open-source printed circuit board by mkarliner, from the mkarliner/BelshazzarClock repository on GitHub. It is a 2-layer board of 159.5 × 53.3 mm with 77 parts on 100 nets, routed with 403 tracks and 43 vias.
It is built around the 74AHCT125D and WS2811. Its parts include 30 diodes, 20 resistors, 12 ICs, 10 capacitors and 5 connectors. It belongs with the lEDs and displays boards and the ESP32 and RISC-V boards of this library.
Main components
2
74AHCT125D
SOP-14-40℃~+125℃ 1 4 4.3ns@5V,50pF 4.5V~5.5V 40uA 74AHCT 8mA 8mA Schmitt trigger Tri-State Unidirectional SOP-14 Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffer/Driver/Transceiver
WS2811
SOP-8-25℃~+85℃ 16.5mA 20V 3 5V~24V 800kHz Over Voltage Protection、Short-Circuit Protection PWM SOP-8 LED Drivers ROHSWorldsemiLED Drivers
README
README.mdBelshazzar Luminous Night Clock
Here are the files for the PCB, micropython code and STL files for Belshazzar's Clock. Refer to the KiCad files for the PCB details and BOM for details of compononents, but they are basically WS2811 SOT8 led drivers, 0805 SMD UV leds and a a small number of resistors and caps, also 0805 SMD.
There are four 3D printed parts, which are small enough to print on most printers.
You will additionally need -
-
Stepper Motor 28BYJ-48 with ULN2003 Driver Board
-
200mm of 100mm ID plastic ducting pipe.
-
White paint or paper to cover the pipe
-
Glow in the dark paint
-
ESP32C3 Super Mini dev board
I've left a space for a 74AHCT125 level converter to boost the 3.3V logic of the ESP32 to 5V for the WS2811, but on my board at least, it works fine without, you can just jumper over the in and out pins on the level converter.
Parts
77| Qty | Value | Footprint | References |
|---|---|---|---|
| 30 | LED | LED_SMD:LED_0805_2012Metric | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +14 |
| 10 | .1uF | Capacitor_SMD:C_0805_2012Metric | C1, C2, C3, C4, C5, C6, C7, C8, C9, C10 |
| 10 | 100R | Resistor_SMD:R_0805_2012Metric | R2, R4, R6, R8, R10, R12, R14, R16, R18, R20 |
| 10 | 33 R | Resistor_SMD:R_0805_2012Metric | R1, R3, R5, R7, R9, R11, R13, R15, R17, R19 |
| 10 | WS2811 | Package_SO:SOP-8_3.9x4.9mm_P1.27mm | U1, U2, U3, U4, U5, U6, U7, U8, U9, U10 |
| 2 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J1, J2 |
| 2 | Conn_01x08_Socket | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J3, J4 |
| 1 | 74AHCT125 | Package_DIP:DIP-14_W10.16mm | U12 |
| 1 | Conn_01x06_Socket | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J5 |
| 1 | ESP32-C3_SUPERMINI | Mikes Library:MODULE_ESP32-C3_SUPERMINI | U11 |
Questions
How big is the BClock PCB?
It measures 159.5 × 53.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the BClock use?
77 parts, built around the 74AHCT125D and WS2811. 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 BClock KiCad files?
From the mkarliner/BelshazzarClock repository on GitHub, at the commit this page was made from: the board is board/BClock.kicad_pcb and its schematic board/BClock.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the BClock design in my own project?
Its repository states no licence, so its author keeps all rights: ask mkarliner before reusing the design.
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