2 layers175.8 × 64 mm
Picoclock
locked/picoclock
This repo is an attempt at building a Pico based alarm clock. It was created for my kids and features:
90 parts
4 layers140 × 54 mm
Picoclock
locked/picoclockThis repo is an attempt at building a Pico based alarm clock. It was created for my kids and features:
- Size
- 140 × 54 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 146
- Nets
- 165
- Pads
- 660
- Tracks, vias
- 1,181, 265
- Pours
- 13
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 9 Jun 2024
- Updated
- 15 Aug 2026
Overview
Picoclock is an open-source printed circuit board by locked, from the locked/picoclock repository on GitHub. It is a 4-layer board of 140 × 54 mm with 146 parts on 165 nets, routed with 1,181 tracks and 265 vias.
It is built around the MCP9808-E/MS, SHT21 and W25Q128JVSIQ, with the 74LS157PC, PCF8563T/5 and PCM5100PW among its other parts. Its parts include 51 capacitors, 33 resistors, 16 connectors, 15 ICs and 11 diodes. It belongs with the ESP32 and RP2350 boards of this library.
Main components
12
MCP9808-E/MS
MSOP-8-40℃~+125℃ 13bit 2.7V~5.5V 250ms I2C、SMBus ±0.5℃ MSOP-8 Temperature Sensors ROHSMicrochip TechnologyTemperature Sensors
SHT21
6-DFN (3x3)Humidity 0 - 100% RH and Temperature -40°C to +125°C Sensor (Digital output, I²C Interface)SensirionUncategorised
W25Q128JVSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 120ms@(32KB) 128Mbit 133MHz 1uA 2.7V~3.6V 20 Years 3ms Power-on reset、Hardware write protection、Software write protection、Write enable latch、Absolute write protection SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
74LS157PC
PDIP-160℃~+70℃ 4.75V~5.25V Single Supply PDIP-16 Signal Switches, Multiplexers, Decoders ROHSTexas InstrumentsSignal Switches, Multiplexers, Decoders
PCF8563T/5
SO-8-40℃~+85℃ 0.25uA 1V~5.5V Battery low-voltage detection、Programmable clock output、Alarm function、Countdown timer I2C Yes SO-8 Real Time Clocks ROHSNXP SemiconductorsReal Time Clocks
PCM5100PW
TSSOP-20-25℃~+85℃ 2 3.3V~3.6V Digital filtering、Power-down mode I2S TSSOP-20 ADCs/DACs - Special Purpose ROHSTexas InstrumentsADCs/DACs - Special Purpose
SCD41-D-R2
LGA-20UncategorisedSensirion
MBR0530
SOD-1231 Independent 30V 5.5A 500mA 550mV@500mA 80uA@30V SOD-123 Schottky Diodes ROHSJiangsu Changjing Electronics Technology (CJ)Schottky Diodes
BSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETs
SS12
SMA(DO-214AC)Schottky Diodeshongjiacheng
ABM8-272-T3
SMD3225-4P-40℃~+85℃ 10pF 12MHz 50Ω SMD crystal oscillator ±30ppm ±30ppm SMD3225-4P Crystals ROHSAbraconCrystalsSJ2-35863B1-SMT-TR
SMD-25℃~+85℃ 12V 1A 3.5mm Headphone Jack Copper alloy Silver SMD Audio Connectors ROHSCUIAudio Connectors (Headphones)
README
README.mdRP2040 based Alarm Clock
Presentation
This repo is an attempt at building a Pico based alarm clock. It was created for my kids and features:
- date/time (obviously)
- alarm (plays wav file on sdcard)
- weather (current and forecast)
- epaper screen
- 3d printable case
The configuration is done remotely, and the clock synchronize from time to time (it can be forced too). The time is also fetched from a remote server.
Repository Architecture
- 3d: contains printable models for the case, buttons
- fw: the firmware, based on a lightweight "rtos"
- pcb: the PCBs:
- the main PCB receiving the RP2040 board
- the front PCB with the backlight leds
- api: remote api basic php script
Pictures
Build
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Debug ..
makeParts
146| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 100n | Capacitor_SMD:C_0402_1005Metric | C31, C34, C36, C37, C38, C39, C40, C41, C42, C43, C44, C45 |
| 10 | 1uF | Capacitor_SMD:C_0603_1608Metric | C14, C21, C22, C23, C24, C25, C26, C27, C28, C49 |
| 9 | 10K | Resistor_SMD:R_0402_1005Metric | R16, R17, R18, R19, R21, R28, R29, R31, R38 |
| 8 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C2, C3, C4, C5, C9, C12, C54, C55 |
| 6 | 10K | Resistor_SMD:R_0603_1608Metric | R8, R9, R10, R11, R12, R13 |
| 6 | SW_Push | clock:SW_SPST_TL3301TG | SW1, SW2, SW3, SW4, SW5, SW6 |
| 4 | 10uF | Capacitor_SMD:C_0805_2012Metric | C6, C46, C47, C48 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3_Pad | H1, H2, H3, H4 |
| 3 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C18, C19, C20 |
| 3 | 40 | Resistor_SMD:R_0603_1608Metric | R32, R33, R34 |
| 3 | 470 | Resistor_SMD:R_0603_1608Metric | R2, R4, R37 |
| 3 | LED | LED_SMD:LED_PLCC_2835 | D1, D5, D6 |
| 3 | LED_RGBA | LED_SMD:LED_LiteOn_LTST-C19HE1WT | D7, D8, D9 |
| 3 | MBR0530 | Diode_SMD:D_SOD-123 | D2, D3, D4 |
| 2 | 15p | Capacitor_SMD:C_0402_1005Metric | C32, C33 |
| 2 | 1k | Resistor_SMD:R_0402_1005Metric | R15, R25 |
| 2 | 2.2nF | Capacitor_SMD:C_0603_1608Metric | C10, C11 |
| 2 | 220pF | Capacitor_SMD:C_0603_1608Metric | C29, C30 |
| 2 | 27 | Resistor_SMD:R_0402_1005Metric | R26, R27 |
| 2 | 4.7u | Capacitor_SMD:C_0402_1005Metric | C17, C35 |
| 2 | 4.7u | RP2350_80QFN_minimal:C_0402_1005Metric_small_pads | C13, C16 |
| 2 | 4K7 | Resistor_SMD:R_0402_1005Metric | R1, R3 |
| 2 | 5.1K | Resistor_SMD:R_0603_1608Metric | R5, R6 |
| 2 | BSS138 | Package_TO_SOT_SMD:SOT-23-3 | Q1, Q3 |
| 2 | FerriteBead | Inductor_SMD:L_0603_1608Metric | FB1, FB2 |
| 2 | SS12 | Diode_SMD:D_SOD-323 | D10, D11 |
| 2 | UART | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J1, J3 |
| 1 | 0.47 | Resistor_SMD:R_0603_1608Metric | R22 |
| 1 | 1.5K | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric | C15 |
| 1 | 10uH | Inductor_SMD:L_TDK_NLV32_3.2x2.5mm | L1 |
| 1 | 2.2uF | Capacitor_SMD:C_0402_1005Metric | C8 |
| 1 | 2.2uF | Capacitor_SMD:C_0603_1608Metric | C7 |
| 1 | 22pF | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 3.3u | RP2350_80QFN_minimal:L_pol_2016 | L2 |
| 1 | 33 | Resistor_SMD:R_0402_1005Metric | R14 |
| 1 | 3V Cell | cell:MPD_BC501SM-TR | BT1 |
| 1 | 74LS157 | Package_SO:SOP-16_4.55x10.3mm_P1.27mm | U10 |
| 1 | ABM8-272-T3 | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y2 |
| 1 | AUDIO | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J9 |
| 1 | Conn_01x21_Pin | RMC20452T:RMC20452T | J8 |
| 1 | Conn_01x24 | Connector_FFC-FPC:Hirose_FH12-24S-0.5SH_1x24-1MP_P0.50mm_Horizontal | J15 |
| 1 | Crystal | Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm | Y1 |
| 1 | DBG | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J7 |
| 1 | DNF | Resistor_SMD:R_0402_1005Metric | R24 |
| 1 | ESP32-WROOM-E | PCM_Espressif:ESP32-WROOM-32E | U9 |
| 1 | ESP32_IO0 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J13 |
| 1 | ESP32_UART1 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J11 |
| 1 | LED_5V | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J12 |
| 1 | MCP45X1-104E | Package_SO:MSOP-8_3x3mm_P0.65mm | U7 |
| 1 | MCP9808 | Package_SO:MSOP-8_3x3mm_P0.65mm | U3 |
| 1 | Micro_SD_Card_Det1 | clock:microSD_HC_Hirose_DM3AT-SF-PEJM5_combined_MSD-4-A | J5 |
| 1 | NCP1117-3.3_SOT223 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U8 |
| 1 | PAM8302A | Package_SO:SOP-8_3.76x4.96mm_P1.27mm | U5 |
| 1 | PCF8563T | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | PCM5100 | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U4 |
| 1 | RP2350_80QFN | RP2350_80QFN_minimal:RP2350-QFN-80-1EP_10x10_P0.4mm_EP3.4x3.4mm_ThermalVias | U2 |
| 1 | SCD41-D-R2 | Sensor:Sensirion_SCD4x-1EP_10.1x10.1mm_P1.25mm_EP4.8x4.8mm | U16 |
| 1 | SHT21 | SHT21:SHT21 | U12 |
| 1 | SHT4x | Sensor_Humidity:Sensirion_DFN-4_1.5x1.5mm_P0.8mm_SHT4x_NoCentralPad | U15 |
| 1 | SJ2-35863B1-SMT-TR | SJ2-35863B1-SMT-TR:CUI_SJ2-35863B1-SMT-TR | J14 |
| 1 | STCC4 | stcc4:STCC4 | U17 |
| 1 | SW_Push | Button_Switch_THT:SW_Tactile_SPST_Angled_PTS645Vx31-2LFS | SW7 |
| 1 | UART_S88 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J16 |
| 1 | USB | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J10 |
| 1 | USB_A | Connector_USB:USB_A_Connfly_DS1095 | J2 |
| 1 | USB_C_Receptacle | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J6 |
| 1 | W25Q128JVS | Package_SO:SOIC-8_5.3x5.3mm_P1.27mm | U6 |
| 1 | xx | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J4 |
| 1 | ~ | Lunasys_Library:LP5817 | U11 |
Questions
How big is the Picoclock PCB?
It measures 140 × 54 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Picoclock use?
146 parts, built around the MCP9808-E/MS, SHT21, W25Q128JVSIQ and 74LS157PC. 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 Picoclock KiCad files?
From the locked/picoclock repository on GitHub, at the commit this page was made from: the board is pcb-mini/picoclock.kicad_pcb and its schematic pcb-mini/CYW43439/4L/CYW43439.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Picoclock design in my own project?
Its repository states no licence, so its author keeps all rights: ask locked before reusing the design.
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