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ESP32-Writer

74th·esp32-dev-boards·ESP32-Writer-CH340G/ESP32-Writer-CH340G.kicad_pcb

ESP32-Writer PCB layout, top view — open source ESP32 board by 74th
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About the ESP32-Writer PCB

ESP32-Writer is an open source ESP32 PCB design by 74th, published on GitHub under the MIT license. It is a 2-layer board measuring 54.6 × 31.1 mm, with 29 components from 20 distinct parts.

Its main chip is the ESP32-C3-MINI-1, from the ESP32 family. Other key parts include the AMS1117-3.3. By type, the board carries 9 resistors, 6 capacitors, 4 connectors, 3 diodes, 2 ICs and 2 transistors.

It belongs with the usb & debug tools and dev boards & breakouts designs in this gallery.

From the project

ESP32 Dev Boards PCB

- ESP32 の EN、GPIO0 用のピンを持ち、esptools を使ったアップロードで、EN、GPIO0 を自動で操作します。 - ESP32 のデバッグツールである ESP-Prog に付属する USB シリアル互換の、ボックスピンヘッダを持ちます。 - 電源用 USB と通信用 USB が別れています。これにより、電力の小さい PC の USB でも追加の電源用 USB で電源供給できます。

- USB を、電源用と通信用の 2 つをもたせたいから。これがないと USB の給電能力が低い場合、PC で Write 後に、電源供給 USB への繋ぎ変えが必要になり面倒くさい。

- ダイオードの電圧低下が大きい場合、ダイオードの代わりに 0R レジスタを入れることもできます（製作者はそれで使っています）

- Semantics ESP32-writer-2.0.1-semantics.pdf - PCB ESP32-writer-2.0.1-pcb.pdf

Main components on the ESP32-Writer

ESP32-C3-MINI-1AMS1117-3.3

ESP32-Writer bill of materials (BOM)

29 components, 20 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-C3-MINI-1
AMS1117-3.3
U1
1
AMS1117-3.3
CH340C
U2
2
2N7002
Q1, Q2
1
ESP-Prog-ProgramCOM-SEND
J1
2
USB2.0_C
J2, J4
1
UART-OUTPUT
J3
2
Polyfuse
F1, F2
1
SKRPABE010
SK-12D02-G020
SW1
1
BLUE
D1
1
NC(1N4148W)
D2
1
PMEG2010ER
D3
2
10U
1u
C1, C2
2
100N
100n
C3, C4
1
100n
C5
1
22u
C8
1
5.1K
10k
R1
3
10K
5.1k
R2, R3, R5
1
5.1K
5.1k
R4
1
5.1K
10(470)
R6
3
10
R7, R8, R9

ESP32-Writer design files

The KiCad project lives in the 74th/esp32-dev-boards repository on GitHub; these links point at the commit this page was built from.

ESP32-Writer: common questions

What microcontroller does the ESP32-Writer use?

The ESP32-Writer is built around the ESP32-C3-MINI-1, from the ESP32 family.

How big is the ESP32-Writer PCB?

The ESP32-Writer measures 54.6 × 31.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ESP32-Writer?

29 components, from 20 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 ESP32-Writer design files?

From the 74th/esp32-dev-boards 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 ESP32-Writer design in my own project?

Yes, under the terms of its MIT license, which 74th chose for the repository.

Can I test firmware for the ESP32-Writer 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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