Watchy hardware
About the Watchy hardware PCB
Watchy hardware is an open source ESP32 PCB design by sqfmi, published on GitHub under the MIT license. It is a 4-layer board measuring 33.8 × 46 mm, with 75 components from 40 distinct parts.
Its main chip is the ESP32-S3, from the ESP32 family. Other key parts include the SR2HARU, RT908033, TP4054, USBLC6-2P6 and BMA423. By type, the board carries 28 capacitors, 20 resistors, 6 ICs, 5 diodes, 4 switches and 3 transistors.
From the project
Watchy Hardware CAD Files
Buy Watchy from The Pi Hut, Crowd Supply, and Mouser!
Visit https://watchy.sqfmi.com to get started!
Main components on the Watchy hardware
Watchy hardware bill of materials (BOM)
75 components, 40 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SR2HARU | SR2HARU | U1 |
| 1 | RT908033 | SOT-23-5 | U2 |
| 1 | TP4054 | SOT-23-5 | U3 |
| 1 | ESP32-S3 | QFN-56-1EP_7x7mm_P0.4mm_EP5.6x5.6mm | U4 |
| 1 | USBLC6-2P6 | SOT-666 | U5 |
| 1 | BMA423 | LGA-12_2x2mm_P0.5mm | U6 |
| 1 | Vibration_Motor | Motor_Header | M1 |
| 1 | CJ2301 | SOT-23 | Q1 |
| 1 | S8050 | SOT-23 | Q2 |
| 1 | AO3400A | SOT-23 | Q3 |
| 1 | 32.768KHz | Crystal_SMD_2012-2Pin_2.0x1.2mm | Y1 |
| 1 | 40MHz | Crystal_SMD_2520-4Pin_2.5x2.0mm | Y2 |
| 1 | Battery | 1.25T-2PWT (Molex 532610271) | J1 |
| 1 | Micro USB | USB_Micro-B | J2 |
| 1 | FPC24(0.5MM) | 24_Pins_0.5mm_Pitch_ZIF_Connector_UP | J3 |
| 1 | Antenna_Chip | SWRA117D | AE1 |
| 1 | BTN2 | EVQPUC | SW1 |
| 1 | BTN1 | EVQPUC | SW2 |
| 1 | BTN3 | EVQPUC | SW3 |
| 1 | BTN4 | EVQPUC | SW4 |
Show 20 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | MBR0530 | D_SOD-123 | D1, D3, D4, D5 |
| 1 | 1N4001 | D_SOD-123F | D2 |
| 1 | TBD | L_0402_1005Metric | L1 |
| 1 | 47uH 0.5A | L_Taiyo-Yuden_NR-40xx | L2 |
| 2 | 10uF | C_0402_1005Metric | C1, C10 |
| 4 | 1uF | C_0402_1005Metric | C2, C3, C4, C15 |
| 6 | 100nF | C_0402_1005Metric | C5, C6, C11, C12, C13, C14 |
| 2 | TBD | C_0402_1005Metric | C7, C9 |
| 2 | 22pF | C_0402_1005Metric | C16, C19 |
| 2 | 18pF | C_0402_1005Metric | C17, C18 |
| 2 | 4.7uF/50V | C_0603_1608Metric | C20, C21 |
| 8 | 1uF/50V | C_0402_1005Metric | C22, C23, C24, C25, C26, C27, C28, C29 |
| 4 | 10K | R_0402_1005Metric | R1, R3, R18, R20 |
| 9 | 100K | R_0402_1005Metric | R2, R4, R6, R7, R8, R10, R11, R15 +1 |
| 2 | 51K | R_0402_1005Metric | R5, R14 |
| 1 | 360K | R_0402_1005Metric | R9 |
| 1 | TBD | R_0402_1005Metric | R12 |
| 1 | 1K | R_0402_1005Metric | R13 |
| 1 | 1M | R_0402_1005Metric | R16 |
| 1 | 2.2 | R_0402_1005Metric | R17 |
Watchy hardware design files
The KiCad project lives in the sqfmi/watchy-hardware repository on GitHub; these links point at the commit this page was built from.
- LayoutWatchy.kicad_pcb
- SchematicWatchy.kicad_sch
Watchy hardware: common questions
What microcontroller does the Watchy hardware use?
The Watchy hardware is built around the ESP32-S3, from the ESP32 family.
How big is the Watchy hardware PCB?
The Watchy hardware measures 33.8 × 46 mm, has 4 copper layers and is 1 mm thick.
How many components are on the Watchy hardware?
75 components, from 40 distinct parts. The full bill of materials is listed on this page.
Where can I download the Watchy hardware design files?
From the sqfmi/watchy-hardware repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Watchy hardware design in my own project?
Yes, under the terms of its MIT license, which sqfmi chose for the repository.
Can I test firmware for the Watchy hardware 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.
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