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Clock

Matir·hacks·pcbs/clock/clock/clock.kicad_pcb

Clock PCB layout, top view — open source ESP32 board by Matir
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About the Clock PCB

Clock is an open source ESP32 PCB design by Matir, published on GitHub under the BSD-2-Clause license. It is a 2-layer board measuring 196.7 × 31.5 mm, with 90 components from 32 distinct parts.

Its main chip is the ESP32-WROOM-32, from the ESP32 family. Other key parts include the AP2112K-3.3, 74HCT245, PCF85263ATT, TCA6416APWR and AT24CS01-SSHM. By type, the board carries 38 resistors, 16 ICs, 14 capacitors, 12 transistors, 4 diodes and 2 connectors.

From the project

Miscellaneous Hacks

Main components on the Clock

AP2112K-3.3ESP32-WROOM-3274HCT245PCF85263ATTTCA6416APWRAT24CS01-SSHMKCSC02-105

Clock bill of materials (BOM)

90 components, 32 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
AP2112K-3.3
USBLC6-2SC6
U1
1
ESP32-WROOM-32
AP2112K-3.3
U2
1
74HCT245
SAMD21Exx
U3
1
PCF85263ATT
U4
1
TCA6416APWR
U5
1
AT24CS01-SSHM
U6
10
KCSC02-105
U7, U8, U9, U10, U11, U12, U13, U14 +2
12
BSS138
Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 +4
1
32.768k
Y1
1
SCREW_TERMINAL_01X02
USB_B_Micro
J1
1
CORTEX
J2
1
CR2032
BT1
1
SW_Push
SW1
4
LED
D1, D2, D3, D4
1
Ferrite_Bead
FB1
2
0.1U
10u
C1, C2
2
10U
u1
C3, C4
4
u1
C5, C10, C13, C14
1
10U
100u
C6
1
0.1U
1u
C7
Show 12 more
QtyPartRefs
1
10U
1u
C8
1
1u
C9
1
0.1U
u1
C11
1
10u
C12
2
300
R1, R5
12
10k
R2, R4, R19, R20, R23, R24, R27, R28 +4
1
10K
300
R3
2
330
10k
R6, R8
1
330
300
R7
8
390
R9, R10, R11, R12, R13, R14, R15, R16
10
200
R17, R18, R21, R22, R25, R26, R29, R30 +2
2
2.2k
R37, R38

Clock design files

The KiCad project lives in the Matir/hacks repository on GitHub; these links point at the commit this page was built from.

Clock: common questions

What microcontroller does the Clock use?

The Clock is built around the ESP32-WROOM-32, from the ESP32 family.

How big is the Clock PCB?

The Clock measures 196.7 × 31.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Clock?

90 components, from 32 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 Clock design files?

From the Matir/hacks repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Clock design in my own project?

Yes, under the terms of its BSD-2-Clause license, which Matir chose for the repository.

Can I test firmware for the Clock 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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