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ESP32-writer

74th·esp32-dev-boards·ESP32-writer/ESP32-writer.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 31.8 × 30.6 mm, with 18 components from 14 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 5 resistors, 4 capacitors, 3 connectors, 2 ICs, 2 transistors and 2 diodes.

It belongs with the 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）

- v2.1.0 - CH340G に変更（ESP-Writer-CH340G として、別プロダクトへ変更） - v2.0.2 - USB Type-C ソケットのフットプリントを実装しやすいものに変更 - v2.0.1 - 配線ミスを修正 - v2.0.0 - ESP-Prog 互換 Box Pin Header を追加

ESP32-writer, from the project README
From the project README

Main components on the ESP32-writer

ESP32-C3-MINI-1AMS1117-3.3

ESP32-writer bill of materials (BOM)

18 components, 14 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-C3-MINI-1
CH340C
U1
1
AMS1117-3.3
ESP-Prog-ProgramCOM-SEND
U2
2
2N7002
Q1, Q2
2
USB2.0_C
J1, J3
1
UART-OUTPUT
J2
1
LED
D1
1
D_Schottky
D2
1
10U
10u
C1
1
10U
100n
C2
1
100N
100n
C3
1
100N
10u
C4
2
5.1K
5.1k
R1, R4
2
10K
5.1k
R2, R5
1
10K
1k
R3

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 31.8 × 30.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ESP32-writer?

18 components, from 14 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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