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jason-watkins·nixie-clock·pcb/main/main.kicad_pcb

Main PCB layout, top view — open source ESP32 board by jason-watkins

About the Main PCB

Main is an open source ESP32 PCB design by jason-watkins, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 70 × 65 mm, with 91 components from 52 distinct parts.

Its main chip is the ESP32-S3-WROOM-1, from the ESP32 family. Other key parts include the 74LVC1G17, USBLC6-2SC6, TS3USB221A, CYPD3176 and TPS63070. By type, the board carries 37 resistors, 22 capacitors, 10 diodes, 8 ICs, 7 connectors and 3 transistors.

It belongs with the displays & leds and power & battery designs in this gallery.

From the project

USB-C powered nixie tube clock. Four IN-12B digits, two INS-1 colon lamps, K155ID1 BCD decoder/drivers.

USB-C powered nixie tube clock. Four IN-12B digits, two INS-1 colon lamps, K155ID1 BCD decoder/drivers.

USB-PD negotiates 5-12V supply and feeds it into 3 converters:

- Flyback boost: 170V for the tube anodes - 3.3V buck boost for the MCU. Boost exists to make sure a 3.3V FTDI type UART adapter provides the full 3.3V to the rail. - 5V buck for the BCD drivers, bypassed if the source itself is 5V

Main, from the project README
From the project README

Main components on the Main

74LVC1G17ESP32-S3-WROOM-1USBLC6-2SC6TS3USB221ACYPD3176TPS63070TPS629203

Main bill of materials (BOM)

91 components, 52 distinct parts.

QtyPartRefs
2
74LVC1G17
U1, U2
1
ESP32-S3-WROOM-1
U3
1
USBLC6-2SC6
U101
1
TS3USB221A
U102
1
CYPD3176
U103
1
TPS63070
U121
1
TPS629203
U131
1
FDS4935A
Q101
1
DMP3099L
Q122
1
FDC6312P
Q131
1
JTAG
J2
1
JTAG SRC
J3
1
26 pin IDC
J4
1
Conn_01x06
J5
1
I2C
J6
1
FLASH
J7
1
USB_C_Receptacle_USB2.0_16P
J101
1
Boot
SW1
1
Reset
SW2
1
TX
D1
Show 32 more
QtyPartRefs
1
RX
D2
1
STATUS
D3
1
V_{BUSC}
D101
1
SD15Q-7
D102
1
MM3Z10VST1G
D103
1
FAULT
D104
1
V_{BUS}
D105
1
+3.3V
D122
1
+5V
D131
1
1.5uH
L121
1
2.2uH
L131
8
100nF
C1, C2, C3, C5, C102, C106, C108, C123
4
22uF
C4, C125, C132, C133
1
4.7uF
C101
4
1uF
C103, C104, C105, C107
2
10uF
C121, C131
1
10uF
C122
1
10uF
C124
1
47uF
C126
1
150
R1
12
10k
R2, R5, R7, R9, R10, R11, R12, R102 +4
3
680
R3, R4, R8
7
100k
R6, R104, R112, R113, R122, R123, R129
2
20k
R101, R111
2
1k
R105, R110
2
5.1k
R106, R108
3
2.4k
R107, R109, R128
1
120k
R125
1
39k
R126
1
27k
R131
1
80.6k
R132
1
5.6k
R134

Main design files

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

Main: common questions

What microcontroller does the Main use?

The Main is built around the ESP32-S3-WROOM-1, from the ESP32 family.

How big is the Main PCB?

The Main measures 70 × 65 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Main?

91 components, from 52 distinct parts. The full bill of materials is listed on this page.

Where can I download the Main design files?

From the jason-watkins/nixie-clock repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Main design in my own project?

Yes, under the terms of its CC-BY-SA-4.0 license, which jason-watkins chose for the repository.

Can I test firmware for the Main 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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