HardLabs

Nebula

Thecactusman0·Nebula-openwatch·Nebula - Master/Kicad/Watch/Nebula.kicad_pcb

Nebula PCB layout, top view — open source ESP32 board by Thecactusman0

About the Nebula PCB

Nebula is an open source ESP32 PCB design by Thecactusman0, published on GitHub. It is a 2-layer board measuring 39.7 × 39.9 mm, with 59 components from 38 distinct parts.

Its main chip is the ESP32-S3-MINI-1-N8, from the ESP32 family. Other key parts include the XC3202B183MR-G, MCP73831T-2ATI/OT, LTR-303ALS-01, LR1801G-33-SH2-R and PCF8563TS. By type, the board carries 20 capacitors, 12 ICs, 11 resistors, 3 transistors, 3 switches and 3 diodes.

It belongs with the audio, iot & wireless and wearables designs in this gallery.

From the project

Nebula is a ESP32 based smartwatch that features a rotating bezel encoder

-ESP32-S3-MINI with wifi and bluetooth LE capabilities

-I2C Ambient light sensor for automatic screen dimming

-Onboard ldo regulator with voltage supervisor

-I2S amplifier for audio output (BLUETOOTH LE DOES NOT SUPPORT STREAMING AUDIO,CHANGES ARE NEEDED TO BOARD TO ENABLE USE OF THIS CHIP)

-I2S Mems microphone for audio input(BLUETOOTH LE DOES NOT SUPPORT STREAMING AUDIO)

Main components on the Nebula

XC3202B183MR-GESP32-S3-MINI-1-N8MCP73831T-2ATI/OTLTR-303ALS-01LR1801G-33-SH2-RPCF8563TSMAX98357AETEMPU6050INMP441MAX811TEUS-T

Nebula bill of materials (BOM)

59 components, 38 distinct parts.

QtyPartRefs
3
XC3202B183MR-G
U1, U2, U3
1
ESP32-S3-MINI-1-N8
U4
1
MCP73831T-2ATI/OT
U5
1
LTR-303ALS-01
U6
1
LR1801G-33-SH2-R
U7
1
PCF8563TS
U8
1
MAX98357AETE
U9
1
MPU6050
U10
1
INMP441
U11
1
MAX811TEUS-T
U12
1
HMotor
M1
2
s8050
Q1, Q3
1
CJ3139K
Q2
1
32.768KHz
Y1
1
Female dock
J1
1
Display
J2
1
Battery
BT1
1
Polyfuse
F1
1
Speaker
LS1
3
SW_Push
SW1, SW2, SW3
Show 18 more
QtyPartRefs
1
LED
D1
2
SD0805S020S1R0
D2, D3
11
0.1uF
C1, C2, C3, C5, C7, C8, C9, C16 +3
3
4.7uF
C4, C6, C11
1
22uF
C10
2
12pF
C12, C13
1
1uF
C15
1
22nF
C19
1
10uF
C22
1
5K
R1
1
442K
R5
1
160K
R6
1
470
R7
2
1K
R10, R11
1
10
R12
1
100K
R13
1
10k
R20
2
4.7K
R21, R22

Nebula design files

The KiCad project lives in the Thecactusman0/Nebula-openwatch repository on GitHub; these links point at the commit this page was built from.

Nebula: common questions

What microcontroller does the Nebula use?

The Nebula is built around the ESP32-S3-MINI-1-N8, from the ESP32 family.

How big is the Nebula PCB?

The Nebula measures 39.7 × 39.9 mm, has 2 copper layers and is 0.8 mm thick.

How many components are on the Nebula?

59 components, from 38 distinct parts. The full bill of materials is listed on this page.

Where can I download the Nebula design files?

From the Thecactusman0/Nebula-openwatch repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Nebula design in my own project?

The repository has no license, so all rights stay with Thecactusman0. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Nebula 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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