HardLabs

Broadcast clock

espena·broadcast-clock·hardware/broadcast_clock.kicad_pcb

Broadcast clock PCB layout, top view — open source ESP32 board by espena

About the Broadcast clock PCB

Broadcast clock is an open source ESP32 PCB design by espena, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 239.5 × 239.5 mm, with 440 components from 50 distinct parts.

Its main chip is the ESP32-WROVER-E, from the ESP32 family. Other key parts include the MAX6952, TLC5940PWP, LEA-M8T, NCP1117-5.0 and LM2596DS-ADJ. By type, the board carries 360 diodes, 30 capacitors, 24 resistors, 15 ICs, 3 connectors and 2 switches.

It belongs with the rf & radio and iot & wireless designs in this gallery.

From the project

Digital precision studio/broadcast masterclock with WiFi configuration, acts as local NTP server with accurate GPS time sync.

Digital precision studio/broadcast master clock with WiFi configuration, NTP client/server and GPS time sync.

You'll find a complete project description on my personal home page.

The enclosure is an 25x25 cm IKEA "Sannahed" photo frame, which is deep enough to encapsulate the circuitry. I replaced the provided plexi glass with a dark acrylic glass plate.

There are no traditional buttons to control the clock. Instead, it has a browser based web configurator. When powered on, the clock will expose a dedicated wifi network for 30 seconds. Connect to the network in order to access the clock's…

Broadcast clock, from the project README
From the project README

Main components on the Broadcast clock

MAX6952ESP32-WROVER-ETLC5940PWPLEA-M8TNCP1117-5.0LM2596DS-ADJNCP1117-3.3VEML7700

Broadcast clock bill of materials (BOM)

440 components, 50 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
MAX6952
U1, U2
1
ESP32-WROVER-E
U3
5
TLC5940PWP
U4, U5, U6, U7, U8
1
LEA-M8T
U9
1
NCP1117-5.0
U10
1
LM2596DS-ADJ
U11
3
NCP1117-3.3
U12, U13, U14
1
VEML7700
U15
1
UART MCU
J1
1
POWER
J2
1
UART GPS
J3
1
Active GPS antenna 3.3V
AE1
1
CR 2032
BT1
1
Buzzer
BZ1
1
250mA
F1
1
BOOT
SW1
1
RESET
SW2
214
620NM
620nm
D1, D2, D3, D4, D5, D6, D7, D8 +206
140
620NM
620nm
D213, D214, D215, D216, D217, D218, D219, D220 +132
1
SK33
D355
Show 30 more
QtyPartRefs
1
CMS04
D356
1
470NM
470nm
D357
1
570NM
570nm
D358
1
590NM
590nm
D359
1
620NM
620nm
D360
1
37UH
37uH
L1
1
27NH
27nH
L2
2
26PF
27pF
C1, C4
12
100NF
100nF
C2, C3, C7, C8, C9, C10, C11, C20 +4
2
47UF
47µF
C5, C6
1
1UF
1μF
C12
1
47UF
47μF
C13
3
820UF
820μF
C14, C19, C28
2
100UF
100μF
C15, C25
1
40NF
39nF
C16
1
10NF
10nF
C17
1
47PF
47pF
C18
3
10µF
C21, C24, C27
1
10μF
C23
2
53.6K
53,6kΩ
R1, R5
3
4.7K
4,7kΩ
R2, R3, R13
2
4,7kΩ
R4, R12
5
2kΩ
R6, R7, R8, R9, R10
1
10kΩ
R11
5
10K
10kΩ
R14, R15, R16, R22, R213
2
4K7
4,7kΩ
R17, R18
1
4K7
4,7k
R19
1
5,6kΩ
R20
1
1kΩ
R21
1
10Ω
R24

Broadcast clock design files

The KiCad project lives in the espena/broadcast-clock repository on GitHub; these links point at the commit this page was built from.

Broadcast clock: common questions

What microcontroller does the Broadcast clock use?

The Broadcast clock is built around the ESP32-WROVER-E, from the ESP32 family.

How big is the Broadcast clock PCB?

The Broadcast clock measures 239.5 × 239.5 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Broadcast clock?

440 components, from 50 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 Broadcast clock design files?

From the espena/broadcast-clock 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 Broadcast clock design in my own project?

Yes, under the terms of its GPL-3.0 license, which espena chose for the repository.

Can I test firmware for the Broadcast 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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