2 layers134 × 38.5 mm

LED Clock

A low cost PCB project (w/firmware) for a dark-room-friendly digital clock

Size: 134 × 38.5 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 97
Nets: 51
Pads: 245
Tracks, vias: 581, 48
Pours: 2
Routed: Yes
KiCad: KiCad 7 (file 20221018)
Created: 28 Oct 2023
Updated: 7 Dec 2023

Overview

LED Clock is an open-source printed circuit board by bitbank2, from the bitbank2/LED_Clock repository on GitHub, published under the Apache-2.0 licence. It is a 2-layer board of 134 × 38.5 mm with 97 parts on 51 nets, routed with 581 tracks and 48 vias.

It is built around the APDS-9960, AO3400A and DS3231MZ+. Its parts include 58 diodes, 17 resistors, 5 capacitors, 4 transistors and 1 connector. It belongs with the lEDs and displays boards and the RISC-V boards of this library.

Main components

README

README.md

LED_Clock

A CH32V003 low cost 'night clock'
The PCB project was created with KiCad 7.0 and the firmware in the MounRiver Studio IDE. The target device is the TSSOP20 version of the CH32V003.
LED_Clock
Why did you make it?
We like to sleep in a completely black room with no LEDs visible. In the winter, the sun comes up later in the morning and it's useful to know what time it is if you wake up too early and can try to sleep a bit more. My idea was to create an LED clock which displays the time in the day and goes completely black at night. To display the time in a dark room, you wave your hand close to the clock and it will dimly display the time for a few seconds.

The KiCad project files and gerbers (ready to produce at your favorite PCB fab) are in the PCB folder.

If you find this project useful, please consider becoming a sponsor or sending a donation.

Parts

Qty	Value	Footprint	References
58	LED	LED_SMD:LED_0603_1608Metric	D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +42
8	1K	Resistor_SMD:R_0603_1608Metric	R1, R2, R3, R4, R5, R6, R7, R17
4	1k	Resistor_SMD:R_0603_1608Metric	R10, R14, R15, R16
4	AO3400A	Package_TO_SOT_SMD:SOT-23	Q1, Q2, Q3, Q4
4	LOGO	LOGO	G*, G, G, G*
2	10K	Resistor_SMD:R_0603_1608Metric	R11, R12
2	10uF	Capacitor_SMD:C_0603_1608Metric	C1, C5
2	1uF	Capacitor_SMD:C_0603_1608Metric	C3, C4
2	4.7K	Resistor_SMD:R_0603_1608Metric	R8, R9
2	SW_Push	Button_Switch_SMD:SW_Push_1P1T_NO_Vertical_Wuerth_434133025816	PUSH1, PUSH2
1	100n	Capacitor_SMD:C_0603_1608Metric	C2
1	22R	Resistor_SMD:R_0603_1608Metric	R13
1	AP2127K-3.3	Package_TO_SOT_SMD:SOT-23-5	LDO
1	APDS-9960	Sensor:Avago_APDS-9960	APDS-9930
1	Battery_Cell	Battery:CR44_Tabs	3V Batt
1	CH32V003_TSSOP20	Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm	CH32V003
1	DS3231M	Package_SO:SOIC-16W_7.5x10.3mm_P1.27mm	DS3231
1	PROG	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical	J3
1	USB_B_Micro	Connector_USB:USB_Micro-B_Molex_47346-0001	USB

Questions

How big is the LED Clock PCB?

It measures 134 × 38.5 mm and has 2 copper layers, 1.6 mm thick.

What parts does the LED Clock use?

97 parts, built around the APDS-9960, AO3400A and DS3231MZ+. 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 LED Clock KiCad files?

From the bitbank2/LED_Clock repository on GitHub, at the commit this page was made from: the board is PCB/LED_Clock.kicad_pcb and its schematic PCB/LED_Clock.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the LED Clock design in my own project?

Its repository publishes it under the Apache-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Category and platform

LEDs and displays RISC-V

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/bitbank2-led-clock" title="LED Clock in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/bitbank2-led-clock.jpg" alt="LED Clock" width="1200" height="900">

A picture that opens the board, for a README

[![LED Clock](https://pcbkit.io/embed/boards/bitbank2-led-clock.jpg?size=s)](https://pcbkit.io/boards/bitbank2-led-clock)

Source

Repository: bitbank2/LED_Clock
Board file: PCB/LED_Clock.kicad_pcb
Commit: 0aaa8e6
Licence: Apache-2.0

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