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ESP32S3 Snifar

jtsuka·NTC-1A-Control·KiCad/ESP32S3_Snifar/ESP32S3_Snifar.kicad_pcb

ESP32S3 Snifar PCB layout, top view — open source ESP32 board by jtsuka

About the ESP32S3 Snifar PCB

ESP32S3 Snifar is an open source ESP32 PCB design by jtsuka, published on GitHub. It is a 2-layer board measuring 95 × 70 mm, with 39 components from 19 distinct parts.

Its main chip is the XIAO-ESP32S3, from the ESP32 family. By type, the board carries 15 resistors, 10 test points, 5 jumpers, 3 capacitors, 2 connectors and 2 diodes.

From the project

NTC-1A-Control for TEST

MC34063 のロード時電圧ドロップ (-8% 程度) を考慮すると、計算値と実測値は完全に整合する。

これは回路図起こし時の読み取り違いと判明。「青-赤-赤」(6.2k) と「茶-赤-黒」(12k) を視認で読み間違えた可能性が高い。

C3 = 470uF/16V を考えると、出力 15V (実用時) は耐圧ぎりぎりの設計。 Nitta の設計者は「15V 動作前提の DC-DC」として MC34063 を構成していたと判明。

Main components on the ESP32S3 Snifar

XIAO-ESP32S3

ESP32S3 Snifar bill of materials (BOM)

39 components, 19 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
XIAO-ESP32S3
U1
1
2N7000
Q2
1
CONN_01X04_SOCKET
Conn_01x04_Socket
J1
1
J2_PI_01X06_SOCKET
J2_Pi_01x06_Socket
J2
5
JUMPER_2_OPEN
Jumper_2_Open
JP1, JP2, JP5, JP6, JP7
10
TestPoint
TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8 +2
2
BAT43
D1, D2
1
4.7UF
4.7uF
C1
1
0.1UF
0.1uF
C2
1
101
C3
4
1k
R1, R14, R15, R16
1
39K
39k
R3
2
100R
R4, R7
2
10K
10k
R5, R13
1
3K3
3k3
R6
2
4K7
4k7
R8, R10
1
2K2
2k2
R9
1
100K
100k
R11
1
220R
R12

ESP32S3 Snifar design files

The KiCad project lives in the jtsuka/NTC-1A-Control repository on GitHub; these links point at the commit this page was built from.

ESP32S3 Snifar: common questions

What microcontroller does the ESP32S3 Snifar use?

The ESP32S3 Snifar is built around the XIAO-ESP32S3, from the ESP32 family.

How big is the ESP32S3 Snifar PCB?

The ESP32S3 Snifar measures 95 × 70 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ESP32S3 Snifar?

39 components, from 19 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 ESP32S3 Snifar design files?

From the jtsuka/NTC-1A-Control 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 ESP32S3 Snifar design in my own project?

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

Can I test firmware for the ESP32S3 Snifar 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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