4 layers
6 layers41.8 × 42 mm
Watch pcb
dezash123/watch-pcb1ECAD for my custom smartwatch
- Size
- 41.8 × 42 mm
- Copper layers
- 6
- Thickness
- 1.56 mm
- Parts
- 179
- Nets
- 158
- Pads
- 744
- Tracks, vias
- 741, 173
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.99 (file 20241229)
- Created
- 4 Jun 2024
- Updated
- 4 Sep 2025
Overview
Watch pcb is an open-source printed circuit board by dezash123, from the dezash123/watch-pcb repository on GitHub. It is a 6-layer board of 41.8 × 42 mm with 179 parts on 158 nets, routed with 741 tracks and 173 vias.
It is built around the ESP32-S3, APDS-9306-065 and BME280, with the DRV2605LDGS, LIS3MDL and MAX30102 among its other parts. Its parts include 73 capacitors, 44 resistors, 16 ICs, 14 diodes and 10 connectors. It belongs with the wearables boards and the ESP32 boards of this library.
Main components
12
ESP32-S3
QFN-56-EP(7x7)-40℃~+105℃ -98.4dBm 150Mbps 2.412GHz~2.484GHz 2.4GHz 21dBm 340mA 3V~3.6V 88mA SPI、USB、UART、ADC、I2C、I2S、PWM WiFi transceiver QFN-56-EP(7x7) RF Transceiver ICs ROHSEspressif SystemsRF Transceiver ICs
APDS-9306-065
UDFN-6(2x2)-40℃~+85℃ 0.65mm 1.7V~3.6V 20bit 2mm 2mm I2C Light Intensity UDFN-6(2x2) Ambient Light Sensors ROHSBroadcom LimitedAmbient Light Sensors
BME280
LGA-8(2.5x2.5)-40℃~+85℃ 0%RH~100%RH 1.71V~3.6V 1.8uA 16bit I2C、SPI ±0.5℃ ±3%RH LGA-8(2.5x2.5) Temperature and Humidity Sensor ROHSBoschTemperature And Humidity Sensor
DRV2605LDGS
VSSOP-10-0.5mm-40℃~+85℃ 1 2V~5.2V 500uA I2C Yes VSSOP-10-0.5mm Brushed DC Motor Drivers ROHSTexas InstrumentsBrushed DC Motor Drivers
LIS3MDL
LGA-12(2x2)-40℃~+85℃ 1.9V~3.6V 16bit 1uA、40uA、270uA I2C、SPI ±1.6mT、±1.2mT、±8Gs、±4Gs ±1.6mT、±1.2mT、±8Gs、±4Gs LGA-12(2x2) 3D Magnetic Sensors ROHSSTMicroelectronics3D Magnetic Sensors
MAX30102
-Integrated ambient light cancellation (ALC)、Built-in temperature sensor、With proximity detection function - Heart Rate Sensors ROHSAnalog DevicesHeart Rate Sensors
MX25UM51245GXDI00
TBGA-24-40℃~+85℃ 1.65V~2V 100,000 cycles 20 Years 200MHz 512Mbit SPI Software Write Protection、ECC error correction、Write enable latch、Absolute Write Protection TBGA-24 NOR FLASH ROHSMXICNOR FLASHS80KS5123GABHV020
FBGA-24(6x8)40mA、44mA Hardware reset function、Built-in self-refresh logic、Write enable latch FBGA-24(6x8) DRAM ROHSInfineon TechnologiesSRAMTPS63021
UncategorisedTexas Instruments
ESD9B3.3ST5G
SOD-923(0402)ESD And Surge Protection (TVS/ESD)TECH PUBLIC
B3U-3000P-B
SMD-25℃~+70℃ 1.62N 100,000 cycles 12V 2.5mm 3mm 50mA Rectangular Button SMD(SMT) Tab SPST-NO Surface Mount, Right Angle SMD Tactile Switches ROHSOmronTactile SwitchesESD9B5.0ST5G
SOD-923(0402)-55℃~+125℃ 1 10V 15pF 5V 8.4V 80W@8/20us 80nA 8A@8/20us Bidirectional ESD IEC 61000-4-2、IEC 61000-4-5 SOD-923(0402) ESD and Surge Protection (TVS/ESD) ROHSTECH PUBLICESD And Surge Protection (TVS/ESD)
Parts
179| Qty | Value | Footprint | References |
|---|---|---|---|
| 27 | 100nF | Capacitor_SMD:C_0402_1005Metric | C2, C10, C11, C13, C14, C16, C24, C25, C26, C28, C29, C30, C35, C45, C50, C54 +11 |
| 15 | 1uF | Capacitor_SMD:C_0402_1005Metric | C1, C4, C9, C17, C19, C23, C27, C41, C44, C48, C52, C70, C72, C75, C78 |
| 11 | 100k | Resistor_SMD:R_0402_1005Metric | R5, R14, R15, R17, R19, R20, R45, R46, R47, R48, R49 |
| 10 | 0 | Resistor_SMD:R_0201_0603Metric | R8, R35, R37, R44, R50, R51, R52, R53, R54, R55 |
| 10 | 10k | Resistor_SMD:R_0402_1005Metric | R1, R18, R23, R24, R38, R39, R40, R41, R42, R43 |
| 8 | 10uF | Capacitor_SMD:C_0805_2012Metric | C15, C55, C57, C58, C64, C65, C79, C80 |
| 7 | ESD9B3.3ST5G | Diode_SMD:D_SOD-923 | D9, D10, D11, D12, D13, D14, D15 |
| 4 | B3U-3000P-B | Button_Switch_SMD:SW_SPST_B3U-3000P-B | SW1, SW2, SW3, SW4 |
| 4 | C | Capacitor_SMD:C_0402_1005Metric | C31, C32, C46, C47 |
| 4 | ESD9B5.0ST5G | Diode_SMD:D_SOD-923 | D3, D6, D7, D8 |
| 3 | 22uF | Capacitor_SMD:C_0603_1608Metric | C6, C7, C8 |
| 3 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C12, C73, C81 |
| 2 | 1.5pF | Capacitor_SMD:C_0402_1005Metric | C21, C22 |
| 2 | 10nF | Capacitor_SMD:C_0402_1005Metric | C18, C33 |
| 2 | 10uF | Capacitor_SMD:C_0603_1608Metric | C3, C84 |
| 2 | 10uF | Capacitor_SMD:C_0402_1005Metric | C34, C60 |
| 2 | 10uH | Inductor_SMD:L_1008_2520Metric | L7, L8 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R16, R22 |
| 2 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q2, Q3 |
| 2 | CUW Y3SH.B2-JD-42-6T | library:LED_CUW_Y3SH.B2-GFJD-5J6T-Z242-20-R18-Z | D1, D2 |
| 2 | ICS-43434 | Sensor_Audio:InvenSense_ICS-43434-6_3.5x2.65mm | MK1, MK2 |
| 1 | 0 | Resistor_SMD:R_0402_1005Metric | R26 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R29 |
| 1 | 103AT-2 10k | Resistor_SMD:R_0603_1608Metric | TH1 |
| 1 | 1M | Resistor_SMD:R_0402_1005Metric | R10 |
| 1 | 1k | Capacitor_SMD:C_0402_1005Metric | R36 |
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric | C51 |
| 1 | 2.2uF | Capacitor_SMD:C_0402_1005Metric | C20 |
| 1 | 2.7nH | Inductor_SMD:L_0402_1005Metric | L4 |
| 1 | 200k | Resistor_SMD:R_0603_1608Metric | R28 |
| 1 | 220nF | Capacitor_SMD:C_0603_1608Metric | C82 |
| 1 | 22uF | Capacitor_SMD:C_0805_2012Metric | C63 |
| 1 | 24nH | Capacitor_SMD:C_0402_1005Metric | L6 |
| 1 | 30.1 | Resistor_SMD:R_0402_1005Metric | R12 |
| 1 | 32.768kHz | Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm | Y1 |
| 1 | 40MHz(10ppm) | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y2 |
| 1 | 47nF | Capacitor_SMD:C_0402_1005Metric | C5 |
| 1 | 499k | Resistor_SMD:R_0402_1005Metric | R30 |
| 1 | 5 | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 5.32k | Resistor_SMD:R_0402_1005Metric | R11 |
| 1 | 5k | Resistor_SMD:R_0402_1005Metric | R9 |
| 1 | AP3019AK | Package_TO_SOT_SMD:SOT-23-6 | U16 |
| 1 | APDS-9306-065 | OptoDevice:Broadcom_DFN-6_2x2mm_P0.65mm | U15 |
| 1 | BATT+ | TestPoint:TestPoint_THTPad_2.0x2.0mm_Drill1.0mm | J7 |
| 1 | BATT- | TestPoint:TestPoint_THTPad_2.0x2.0mm_Drill1.0mm | J8 |
| 1 | BME280 | Package_LGA:Bosch_LGA-8_2.5x2.5mm_P0.65mm_ClockwisePinNumbering | U3 |
| 1 | BOOT | Button_Switch_SMD:SW_SPST_CK_KXT3 | SW8 |
| 1 | BQ25628E | library:Texas_WQFN-18_2.5x3.0mm_P0.4mm | U2 |
| 1 | BQ27427YZFR | Package_BGA:Texas_DSBGA-9_1.62x1.58mm_Layout3x3_P0.5mm | U4 |
| 1 | BSS214NW | Package_TO_SOT_SMD:SOT-323_SC-70 | Q1 |
| 1 | CHARGING | LED_SMD:LED_0402_1005Metric | D4 |
| 1 | CIGT252010EH1R0MNE | Inductor_SMD:L_1008_2520Metric | L2 |
| 1 | DRV2605LDGS | Package_SO:VSSOP-10_3x3mm_P0.5mm | U13 |
| 1 | ESP32-S3 | Package_DFN_QFN:QFN-56-1EP_7x7mm_P0.4mm_EP4x4mm_ThermalVias | U11 |
| 1 | ESP_ANT | Connector_Coaxial:U.FL_Molex_MCRF_73412-0110_Vertical | J3 |
| 1 | LASER+ | TestPoint:TestPoint_Keystone_5015_Micro_Mini | J9 |
| 1 | LASER- | TestPoint:TestPoint_Keystone_5015_Micro_Mini | J10 |
| 1 | LIS3MDL | Package_LGA:LGA-12_2x2mm_P0.5mm | U10 |
| 1 | LQG15HN2N0C02D | Inductor_SMD:L_0402_1005Metric | L5 |
| 1 | LQM2HPN4R7MG0L | Inductor_SMD:L_1008_2520Metric | L9 |
| 1 | LSM6DSOXTR | Package_LGA:LGA-14_3x2.5mm_P0.5mm_LayoutBorder3x4y | U12 |
| 1 | MAX30102 | OptoDevice:Maxim_OLGA-14_3.3x5.6mm_P0.8mm | U14 |
| 1 | MTR+ | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | J11 |
| 1 | MTR- | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | J13 |
| 1 | MX25UM51245GXDI00 | library:BGA-24_6.0x8.0mm_Layout5x5_P1.0mm | U5 |
| 1 | Micro_SD_Card | library:MOLEX_503398-1892 | J5 |
| 1 | R | Resistor_SMD:R_0402_1005Metric | R13 |
| 1 | S80KS5123GABHV020 | library:BGA-24_6.0x8.0mm_Layout5x5_P1.0mm | U6 |
| 1 | TCA9535MRGER | Package_DFN_QFN:VQFN-24-1EP_4x4mm_P0.5mm_EP2.45x2.45mm | U8 |
| 1 | TLV62569DDC | Package_TO_SOT_SMD:SOT-23-6 | U17 |
| 1 | TPS63021 | library:Texas_VSON-14_3x4mm_ThermalPad | U1 |
| 1 | TPS65631W | Package_SON:WSON-10-1EP_2.5x2.5mm_P0.5mm_EP1.2x2mm_ThermalVias | U9 |
| 1 | TT143AMC12C | library:MOLEX_505550-2420 | J6 |
| 1 | USB_C_Receptacle | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J2 |
| 1 | XFL4020-152ME | Inductor_SMD:L_Coilcraft_XxL4040 | L1 |
| 1 | XFL4020-222ME | Inductor_SMD:L_Coilcraft_XxL4040 | L3 |
Questions
How big is the Watch pcb PCB?
It measures 41.8 × 42 mm and has 6 copper layers, 1.56 mm thick.
What parts does the Watch pcb use?
179 parts, built around the ESP32-S3, APDS-9306-065, BME280 and DRV2605LDGS. 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 Watch pcb KiCad files?
From the dezash123/watch-pcb repository on GitHub, at the commit this page was made from: the board is mainboard/watch-pcb.kicad_pcb and its schematic daughter-board/daughter-board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Watch pcb design in my own project?
Its repository states no licence, so its author keeps all rights: ask dezash123 before reusing the design.
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