2 layers223 × 45.3 mm
Displayboard
njKessel/ESP32s3-NetworkClock
ESP32-S3 smart clock with LED display, weather, moon phase, temperature, Google Calendar
60 parts1MIT
4 layers223 × 50 mm
MainClockPCB
njKessel/ESP32s3-NetworkClock1ESP32-S3 smart clock with LED display, weather, moon phase, temperature, Google Calendar
- Size
- 223 × 50 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 69
- Nets
- 80
- Pads
- 356
- Tracks, vias
- 640, 282
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 30 Sep 2025
- Updated
- 1 Oct 2026
Overview
MainClockPCB is an open-source printed circuit board by njKessel, from the njKessel/ESP32s3-NetworkClock repository on GitHub, published under the MIT licence. It is a 4-layer board of 223 × 50 mm with 69 parts on 80 nets, routed with 640 tracks and 282 vias.
It is built around the 74HC165D, PAM8904QJER and PEC11R-4320K-S0012, with the SPX1117M3-L/TR(MS), USBLC6-2SC6 and 1N5819HW-7-F-01 among its other parts. Its parts include 20 resistors, 19 capacitors, 9 connectors, 8 ICs and 2 diodes. It belongs with the lEDs and displays boards and the ESP32 boards of this library.
Main components
8
74HC165D
SO-16-40℃~+125℃ 1 28ns@6V,50pF 2V~6V 35MHz 500mW 74HC 8 Parallel or Serial to Serial SOIC-16 Shift Registers ROHSNexperiaShift RegistersPAM8904QJER
UQFN3030-16-40℃~+105℃ 2.1V~12V 2.3V~5V Overcurrent Protection UQFN3030-16 Power Management - Specialized ROHSDiodes IncorporatedPower Management - SpecializedPEC11R-4320K-S0012
Through hole- New Arrivals ROHSBournsUncategorised
SPX1117M3-L/TR(MS)
SOT-2230℃~+125℃@(Ta) 1 1.25V~12V 1.4V@(1A) 12V 12mA 1A Adjustable Positive Thermal Shutdown SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMSKSEMIVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
1N5819HW-7-F-01
SOD-123Schottky DiodesDiodes IncorporatedAB26T-32.768KHZ-6
DT-26CrystalsAbracon
LTST-C170KRKT
0805-55℃~+85℃ 130° 20mA 2V 54mcd 631nm 639nm 75mW Discrete Diode Red Water Clear 0805 LED Indication - Discrete ROHSLite-OnLED Indication - Discrete
Parts
69| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | 10k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R5, R6, R7, R8, R9, R10, R11, R14, R15, R16, R17, R18, R19, R20 |
| 6 | 0.1uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C5, C7, C9, C13, C19 |
| 4 | 10uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3, C4, C6, C8 |
| 3 | 0.01uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C2, C11, C12 |
| 3 | 1uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C10, C17, C18 |
| 2 | 4.7k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R12, R13 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R2 |
| 2 | 6pF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C14, C15 |
| 2 | Conn_01x09 | Connector_PinSocket_2.54mm:PinSocket_1x09_P2.54mm_Vertical | J5, J6 |
| 2 | SW_Push | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW1, SW2 |
| 1 | 0 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R4 |
| 1 | 103 | SamacSys_Parts:103 | H1 |
| 1 | 1N5819HW-7-F | Diode_SMD:D_SOD-123 | D1 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3 |
| 1 | 2.2uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C16 |
| 1 | 74HC165 | Package_DIP:DIP-16_W7.62mm_Socket | U4 |
| 1 | AB26T-32.768KHZ-6 | SamacSys_Parts:AB26T32768KHZ6 | Y1 |
| 1 | Conn_01x02_Socket | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J3 |
| 1 | Conn_01x04 | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J7 |
| 1 | Conn_01x05 | Connector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_Vertical | J9 |
| 1 | Conn_01x06 | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | J8 |
| 1 | Conn_01x08 | Connector_JST:JST_XH_B8B-XH-A_1x08_P2.50mm_Vertical | J4 |
| 1 | Conn_01x09_Socket | Connector_JST:JST_XH_B9B-XH-A_1x09_P2.50mm_Vertical | J2 |
| 1 | ESP32-S3-WROOM-2 | RF_Module:ESP32-S3-WROOM-2 | U3 |
| 1 | LTST-C170KRKT | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D2 |
| 1 | MCP7940N-I_P | SamacSys_Parts:DIP781W56P254L950H533Q8N | IC3 |
| 1 | PAM8904QJER | SamacSys_Parts:QFN50P300X300X65-17N-D | IC4 |
| 1 | PEC11R-4320K-S0012 | SamacSys_Parts:PEC11R4320KS0012 | U1 |
| 1 | SPX1117M3-L_TR | SamacSys_Parts:SOT230P700X180-4N | IC2 |
| 1 | TMP275AIDR | SamacSys_Parts:SOIC127P600X175-8N | IC1 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U2 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_GCT_USB4085 | J1 |
The 62 most common of 69 parts.
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Questions
How big is the MainClockPCB PCB?
It measures 223 × 50 mm and has 4 copper layers, 1.6 mm thick.
What parts does the MainClockPCB use?
69 parts, built around the 74HC165D, PAM8904QJER, PEC11R-4320K-S0012 and SPX1117M3-L/TR(MS). 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 MainClockPCB KiCad files?
From the njKessel/ESP32s3-NetworkClock repository on GitHub, at the commit this page was made from: the board is hardware/PCB/mainClockPCB/mainClockPCB/mainClockPCB.kicad_pcb and its schematic hardware/PCB/breadboardDisplayPCB/displayboard/displayboard.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the MainClockPCB design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).