Watch
About the Watch PCB
Watch is an open source ESP32 PCB design by dezash123, published on GitHub. It is a 6-layer board measuring 42 × 42 mm, with 179 components from 76 distinct parts.
Its main chip is the ESP32-S3, from the ESP32 family. Other key parts include the TPS63021, BQ25628E, BME280, BQ27427YZFR and MX25UM51245GXDI00. By type, the board carries 73 capacitors, 44 resistors, 16 ICs, 14 diodes, 10 connectors and 9 inductors.
It belongs with the wearables and power & battery designs in this gallery.
From the project
ECAD for my custom smartwatch
Main components on the Watch
Watch bill of materials (BOM)
179 components, 76 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TPS63021 | Texas_VSON-14_3x4mm_ThermalPad | U1 |
| 1 | BQ25628E | Texas_WQFN-18_2.5x3.0mm_P0.4mm | U2 |
| 1 | BME280 | Bosch_LGA-8_2.5x2.5mm_P0.65mm_ClockwisePinNumbering | U3 |
| 1 | BQ27427YZFR | Texas_DSBGA-9_1.62x1.58mm_Layout3x3_P0.5mm | U4 |
| 1 | MX25UM51245GXDI00 | BGA-24_6.0x8.0mm_Layout5x5_P1.0mm | U5 |
| 1 | S80KS5123GABHV020 | BGA-24_6.0x8.0mm_Layout5x5_P1.0mm | U6 |
| 1 | TCA9535MRGER | VQFN-24-1EP_4x4mm_P0.5mm_EP2.45x2.45mm | U8 |
| 1 | TPS65631W | WSON-10-1EP_2.5x2.5mm_P0.5mm_EP1.2x2mm_ThermalVias | U9 |
| 1 | LIS3MDL | LGA-12_2x2mm_P0.5mm | U10 |
| 1 | ESP32-S3 | QFN-56-1EP_7x7mm_P0.4mm_EP4x4mm_ThermalVias | U11 |
| 1 | LSM6DSOXTR | LGA-14_3x2.5mm_P0.5mm_LayoutBorder3x4y | U12 |
| 1 | DRV2605LDGS | VSSOP-10_3x3mm_P0.5mm | U13 |
| 1 | MAX30102 | Maxim_OLGA-14_3.3x5.6mm_P0.8mm | U14 |
| 1 | APDS-9306-065 | Broadcom_DFN-6_2x2mm_P0.65mm | U15 |
| 1 | AP3019AK | SOT-23-6 | U16 |
| 1 | TLV62569DDC | SOT-23-6 | U17 |
| 1 | BSS214NW | SOT-323_SC-70 | Q1 |
| 2 | BSS138 | SOT-23 | Q2, Q3 |
| 1 | 32.768kHz | Crystal_SMD_3215-2Pin_3.2x1.5mm | Y1 |
| 1 | 40MHz(10ppm) | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y2 |
Show 56 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | USB_C_Receptacle | USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J2 |
| 1 | ESP_ANT | U.FL_Molex_MCRF_73412-0110_Vertical | J3 |
| 1 | Micro_SD_Card | MOLEX_503398-1892 | J5 |
| 1 | TT143AMC12C | MOLEX_505550-2420 | J6 |
| 1 | BATT+ | TestPoint_THTPad_2.0x2.0mm_Drill1.0mm | J7 |
| 1 | BATT- | TestPoint_THTPad_2.0x2.0mm_Drill1.0mm | J8 |
| 1 | LASER+ | TestPoint_Keystone_5015_Micro_Mini | J9 |
| 1 | LASER- | TestPoint_Keystone_5015_Micro_Mini | J10 |
| 1 | MTR+ | TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | J11 |
| 1 | MTR- | TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | J13 |
| 2 | ICS-43434 | InvenSense_ICS-43434-6_3.5x2.65mm | MK1, MK2 |
| 4 | B3U-3000P-B | SW_SPST_B3U-3000P-B | SW1, SW2, SW3, SW4 |
| 1 | BOOT | SW_SPST_CK_KXT3 | SW8 |
| 1 | 103AT-2 10k | R_0603_1608Metric | TH1 |
| 2 | CUW Y3SH.B2-JD-42-6T | LED_CUW_Y3SH.B2-GFJD-5J6T-Z242-20-R18-Z | D1, D2 |
| 4 | ESD9B5.0ST5G | D_SOD-923 | D3, D6, D7, D8 |
| 1 | CHARGING | LED_0402_1005Metric | D4 |
| 7 | ESD9B3.3ST5G | D_SOD-923 | D9, D10, D11, D12, D13, D14, D15 |
| 1 | XFL4020-152ME | L_Coilcraft_XxL4040 | L1 |
| 1 | CIGT252010EH1R0MNE | L_1008_2520Metric | L2 |
| 1 | XFL4020-222ME | L_Coilcraft_XxL4040 | L3 |
| 1 | 2.7nH | L_0402_1005Metric | L4 |
| 1 | LQG15HN2N0C02D | L_0402_1005Metric | L5 |
| 1 | 24nH | C_0402_1005Metric | L6 |
| 2 | 10uH | L_1008_2520Metric | L7, L8 |
| 1 | LQM2HPN4R7MG0L | L_1008_2520Metric | L9 |
| 15 | 1uF | C_0402_1005Metric | C1, C4, C9, C17, C19, C23, C27, C41 +7 |
| 27 | 100nF | C_0402_1005Metric | C2, C10, C11, C13, C14, C16, C24, C25 +19 |
| 2 | 10uF | C_0603_1608Metric | C3, C84 |
| 1 | 47nF | C_0402_1005Metric | C5 |
| 3 | 22uF | C_0603_1608Metric | C6, C7, C8 |
| 3 | 4.7uF | C_0603_1608Metric | C12, C73, C81 |
| 8 | 10uF | C_0805_2012Metric | C15, C55, C57, C58, C64, C65, C79, C80 |
| 2 | 10nF | C_0402_1005Metric | C18, C33 |
| 1 | 2.2uF | C_0402_1005Metric | C20 |
| 2 | 1.5pF | C_0402_1005Metric | C21, C22 |
| 4 | C | C_0402_1005Metric | C31, C32, C46, C47 |
| 2 | 10uF | C_0402_1005Metric | C34, C60 |
| 1 | 1uF | C_0603_1608Metric | C51 |
| 1 | 22uF | C_0805_2012Metric | C63 |
| 1 | 220nF | C_0603_1608Metric | C82 |
| 10 | 10k | R_0402_1005Metric | R1, R18, R23, R24, R38, R39, R40, R41 +2 |
| 1 | 5 | R_0603_1608Metric | R4 |
| 11 | 100k | R_0402_1005Metric | R5, R14, R15, R17, R19, R20, R45, R46 +3 |
| 10 | 0 | R_0201_0603Metric | R8, R35, R37, R44, R50, R51, R52, R53 +2 |
| 1 | 5k | R_0402_1005Metric | R9 |
| 1 | 1M | R_0402_1005Metric | R10 |
| 1 | 5.32k | R_0402_1005Metric | R11 |
| 1 | 30.1 | R_0402_1005Metric | R12 |
| 1 | R | R_0402_1005Metric | R13 |
| 2 | 5.1k | R_0603_1608Metric | R16, R22 |
| 1 | 0 | R_0402_1005Metric | R26 |
| 1 | 200k | R_0603_1608Metric | R28 |
| 1 | 100k | R_0603_1608Metric | R29 |
| 1 | 499k | R_0402_1005Metric | R30 |
| 1 | 1k | C_0402_1005Metric | R36 |
Watch design files
The KiCad project lives in the dezash123/watch-pcb repository on GitHub; these links point at the commit this page was built from.
- Layoutmainboard/watch-pcb.kicad_pcb
- Schematicmainboard/watch-pcb.kicad_sch
Watch: common questions
What microcontroller does the Watch use?
The Watch is built around the ESP32-S3, from the ESP32 family.
How big is the Watch PCB?
The Watch measures 42 × 42 mm, has 6 copper layers and is 1.559 mm thick.
How many components are on the Watch?
179 components, from 76 distinct parts. The full bill of materials is listed on this page.
Where can I download the Watch design files?
From the dezash123/watch-pcb repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Watch design in my own project?
The repository has no license, so all rights stay with dezash123. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Watch without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
Similar boards
ESP32Open Book Abridged Edition
joeycastillo
85 × 115 mm65 parts2LCC-BY-SA-4.08.1k
ESP32Powertrain
byrantech
64 × 45.4 mm171 parts4LMIT4.3k
ESP32Esp32 minimal
atopile
36.2 × 26.8 mm20 parts2LMIT4.0k
ESP32Badge
56.3 × 39 mm239 parts4LMIT4.0k
ESP32Controller
StuckAtPrototype
29 × 74 mm58 parts4LApache-2.03.8k
ESP32Racer
36 × 50.2 mm70 parts4LApache-2.03.8k