154-watch
About the 154-watch PCB
154-watch is an open source ESP32 PCB design by martinberlin, published on GitHub under the CERN-OHL-W-2.0 license. It is a 4-layer board measuring 50.3 × 33 mm, with 60 components from 42 distinct parts.
Its main chip is the ESP32-C3-MINI-1-N4, from the ESP32 family. Other key parts include the PCF8563T, CP2102N-AXX-XQFN20, TP4057-42-SOT26-R and MCP1700-3302E_SOT23. By type, the board carries 20 capacitors, 16 resistors, 6 diodes, 5 ICs, 5 connectors and 4 transistors.
It belongs with the displays & leds and wearables designs in this gallery.
From the project
PCB design for SPI adapters (HATs)
In this repository we will keep PCB designs done in KiCAD for SPI adapters we use. This PCB hardware work uses the CERN Open Hardware Licence Version 2 in the weakly reciprocal version. Be aware that this is experimental work mostly done for research and mass-producing this PCB's is not permitted without our written consent. Fabricating and selling hardware also implies that you need to provide support / fixes and maintain your code examples up to date.
Main components on the 154-watch
154-watch bill of materials (BOM)
60 components, 42 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ESP32-C3-MINI-1-N4 | ESP32-C3-MINI-1-N4 | U1 |
| 1 | PCF8563T | SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | CP2102N-AXX-XQFN20 CP2102N-Axx-xQFN20 | CP2102NA02GQFN20 | U3 |
| 1 | TP4057-42-SOT26-R | TP4057-42-SOT26-R | U4 |
| 1 | MCP1700-3302E_SOT23 | SOT-23 | U5 |
| 1 | SI1308 Si1308 | SOT-323_SC-70 | Q1 |
| 2 | BC817 | SOT-23 | Q2, Q3 |
| 1 | SI2301CDS Si2301CDS | SOT-23 | Q4 |
| 1 | Crystal_Small | Q13FC1350000400-Crystal | Y1 |
| 1 | AFC24-S24FIC-00 | AFC24-S24FIC-00 | J1 |
| 1 | CONN_01X06_FEMALE Conn_01x06_Female | FH34SRJ-6S-0.5SH50-Hirose | J2 |
| 1 | USB_C_Programming | USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J3 |
| 1 | Jack-DC | JST_ACH_BM02B-ACHSS-GAN-ETF_1x02-1MP_P1.20mm_Vertical | J4 |
| 1 | CONN_01X02_MALE Conn_01x02_Male | PinHeader_1x02_P1.27mm_Vertical | J5 |
| 1 | JUMPER_2_BRIDGED Jumper_2_Bridged | SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP1 |
| 1 | RESET | Alps_SKRK | SW1 |
| 3 | MBR0530 | D_SOD-123 | D1, D2, D3 |
| 1 | 1N4148WS | D_SOD-323 | D4 |
| 1 | 1N5817 | D_SOD-123 | D5 |
| 1 | GRE | LED_0805_2012Metric | D6 |
Show 22 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 10UH 10uH | SWPA4030S1R0NT | L1 |
| 6 | 4.7UF 4.7uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3, C7, C9, C10 |
| 4 | 1UF 1uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4, C5, C6, C8 |
| 1 | 4.7uF 50V | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C11 |
| 1 | 4.7UF 4.7uF | C_0603_1608Metric | C12 |
| 2 | 12 pF | C_0603_1608Metric | C13, C14 |
| 2 | C_Polarized 100uF | CP_EIA-3528-21_Kemet-B | C15, C16 |
| 1 | 100 nF | C_0805_2012Metric | C17 |
| 2 | 10UF 10uF | C_0805_2012Metric | C18, C19 |
| 1 | 1uF | C_0402_1005Metric | C20 |
| 1 | 10K | R_0402_1005Metric | R1 |
| 1 | 1.7R | R_0603_1608Metric | R2 |
| 1 | 3R | R_0603_1608Metric | R3 |
| 1 | 4.7 K | R_0603_1608Metric | R4 |
| 4 | 10 K | R_0603_1608Metric | R5, R7, R9, R10 |
| 2 | 4.7K | R_0603_1608Metric | R6, R8 |
| 1 | 2K2 | R_0805_2012Metric | R11 |
| 1 | 5K | R_0603_1608Metric | R12 |
| 1 | 10K | R_0603_1608Metric | R13 |
| 1 | 22K | R_0402_1005Metric | R14 |
| 1 | 47K | R_0402_1005Metric | R15 |
| 1 | 4.7K | R_0402_1005Metric | R16 |
154-watch design files
The KiCad project lives in the martinberlin/H-spi-adapters repository on GitHub; these links point at the commit this page was built from.
154-watch: common questions
What microcontroller does the 154-watch use?
The 154-watch is built around the ESP32-C3-MINI-1-N4, from the ESP32 family.
How big is the 154-watch PCB?
The 154-watch measures 50.3 × 33 mm, has 4 copper layers and is 1.51 mm thick.
How many components are on the 154-watch?
60 components, from 42 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the 154-watch design files?
From the martinberlin/H-spi-adapters repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the 154-watch design in my own project?
Yes, under the terms of its CERN-OHL-W-2.0 license, which martinberlin chose for the repository.
Can I test firmware for the 154-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.
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