2 layers75 × 105 mm

Clock

Electronic desktop clock based on Pico/RP2040.

Size: 75 × 105 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 80
Nets: 90
Pads: 285
Tracks, vias: 425, 72
Pours: 247
Routed: Yes
KiCad: KiCad 7 (file 20221018)
Created: 27 Feb 2023
Updated: 15 Sep 2023

Overview

Clock is an open-source printed circuit board by werediver, from the werediver/clock repository on GitHub. It is a 2-layer board of 75 × 105 mm with 80 parts on 90 nets, routed with 425 tracks and 72 vias.

It is built around the LM4040C30FTA, PMV65UNER and PMV75UP, with the ECS-327MVATX-3-CN-TR among its other parts. Its parts include 20 resistors, 7 ICs, 7 transistors, 4 connectors and 1 crystal. It belongs with the lEDs and displays boards and the RP2040 boards of this library.

Main components

README

README.md

Clock

This Pico-based clock uses a dedicated oscillator for the built-in RP2040 RTC, displays time using seven-segment indicators, features capacitive touch-sensing buttons, and a custom built-in NiMH charging circuit.

The estimated run-time on a single charge is one week (yes, just one week).

When assembling, refer to the interactive BOM page.

NiMH battery charger

mermaid

---
title: Charger state machine
---
stateDiagram-v2
    [*] --> Hold
    Hold --> Charge: ext_power && v < HIGH
    Charge --> Charged: d(v) ≤ NDV || is_adc_saturated() || is_timed_out()
    Charged --> Charge: v < HIGH
    Charge --> Hold: !ext_power
    Charged --> Hold: !ext_power

Add a time-out for v ≥ NiMH_HIGH (1–2h?)

Parts

Qty	Value	Footprint	References
8	270	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R10, R11, R12, R13, R14, R15, R16, R17
8	F	TestPoint:TestPoint_Pad_D1.0mm	TP_F1, TP_F2, TP_F3, TP_F4, TP_F5, TP_F6, TP_F7, TP_F8
8	G	TestPoint:TestPoint_Pad_D1.0mm	TP_G1, TP_G2, TP_G3, TP_G4, TP_G5, TP_G6, TP_G7, TP_G8
6	C	TestPoint:TestPoint_Pad_D1.0mm	TP_C1, TP_C2, TP_C3, TP_C6, TP_C7, TP_C8
6	D	TestPoint:TestPoint_Pad_D1.0mm	TP_D1, TP_D2, TP_D3, TP_D6, TP_D7, TP_D8
5	4.7k	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R3, R4, R5, R6, R7
5	PMV65UN	Package_TO_SOT_SMD:SOT-23	Q3, Q4, Q5, Q6, Q7
4	S511SYGWA/S530-E2	Display_7Segment:D1X8K	U4, U5, U6, U7
3	1M	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R18, R19, R20
2	4.7 0.5W	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R8, R9
2	5.1k	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R1, R2
2	E	TestPoint:TestPoint_Pad_D1.0mm	TP_E2, TP_E7
2	Mouse Bites	Custom:MouseBites_2x05mm	H1, H2
2	PMV75UP	Package_TO_SOT_SMD:SOT-23	Q1, Q2
1	BASE	Connector_PinSocket_2.54mm:PinSocket_1x20_P2.54mm_Vertical	J4
1	BATT	TestPoint:TestPoint_Pad_D2.0mm	TP5
1	CHRG	TestPoint:TestPoint_Pad_D2.0mm	TP4
1	DCHRG EN	TestPoint:TestPoint_Pad_D2.0mm	TP3
1	DISP	Connector_PinHeader_2.54mm:PinHeader_1x20_P2.54mm_Horizontal	J3
1	ECS-327MVATX-3-C	Oscillator:Oscillator_SMD_EuroQuartz_XO32-4Pin_3.2x2.5mm_HandSoldering	X1
1	Keystone 2xAA 1012	Keystone1012:BatteryHolder_Keystone_1012_2xAA	U3
1	LM4040C30	Package_TO_SOT_SMD:SOT-23	U2
1	Logo_Open_Hardware_Small	Symbol:OSHW-Logo2_24.3x20mm_SilkScreen	SYM1
1	Pico	RPi_Pico:RPi_Pico_SMD	U1
1	RTC CLK	TestPoint:TestPoint_Pad_D2.0mm	TP1
1	SWD	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Horizontal	J2
1	TCH A	Custom:TouchPad	TP6
1	TCH B	Custom:TouchPad	TP7
1	TCH C	Custom:TouchPad	TP8
1	USB_C_Receptacle_USB2.0	Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal	J1
1	~{CHRG EN}	TestPoint:TestPoint_Pad_D2.0mm	TP2

Questions

How big is the Clock PCB?

It measures 75 × 105 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Clock use?

80 parts, built around the LM4040C30FTA, PMV65UNER, PMV75UP and ECS-327MVATX-3-CN-TR. 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 werediver/clock repository on GitHub, at the commit this page was made from: the board is KiCad/Clock.kicad_pcb and its schematic KiCad/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 werediver before reusing the design.

Category and platform

LEDs and displays RP2040

Topics

hardware

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/werediver-clock" title="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/werediver-clock.jpg" alt="Clock" width="1200" height="900">

A picture that opens the board, for a README

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

Source

Repository: werediver/clock
Board file: KiCad/Clock.kicad_pcb
Commit: 94458f9
Licence: Not stated

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