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Open telegraph

animesh-chouhan·open-telegraph·hardware/open-telegraph.kicad_pcb

Open telegraph PCB layout, top view — open source ESP32 board by animesh-chouhan
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About the Open telegraph PCB

Open telegraph is an open source ESP32 PCB design by animesh-chouhan, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 48 × 65.5 mm, with 39 components from 26 distinct parts.

Its main chip is the ESP32-S3-WROOM-1-N8, from the ESP32 family. Other key parts include the XC6220B331MR-G, MCP73831T-2ACI/OT and USBLC6-2SC6. By type, the board carries 13 resistors, 10 capacitors, 4 ICs, 4 connectors, 3 switches and 2 transistors.

It belongs with the iot & wireless and power & battery designs in this gallery.

From the project

A pocket-size Morse key. One button, one RGB LED, an ESP32-S3, and a battery. Plug it in over USB-C or pair it over Bluetooth and it types Morse into any device as a standard keyboard. Fully open, down to the copper.

A pocket-size Morse key. One button, one RGB LED, an ESP32-S3, and a battery. Plug it in over USB-C or pair it over Bluetooth and it types Morse into any device as a standard keyboard. Fully open, down to the copper.

Product page: chouhan.ai/products/open-telegraph.html

Phase 1, Prototype Hardware, in development. The engineering documentation below is complete for Rev A; the KiCad schematic and layout are the next step and will land in hardware/.

Open telegraph, from the project README
From the project README

Main components on the Open telegraph

ESP32-S3-WROOM-1-N8XC6220B331MR-GMCP73831T-2ACI/OTUSBLC6-2SC6

Open telegraph bill of materials (BOM)

39 components, 26 distinct parts.

QtyPartRefs
1
ESP32-S3-WROOM-1-N8
U1
1
XC6220B331MR-G
U2
1
MCP73831T-2ACI/OT
U3
1
USBLC6-2SC6
U4
1
SI2301CDS
Q1
1
2N7002
Q2
1
USB4105-GF-A
J1
1
LiPo 250mAh protected
J2
1
Expansion
J3
1
Debug UART0
J4
1
CPT-9019S-SMT
BZ1
1
Omron B3F-4055
SW1
1
BOOT
SW2
1
RESET
SW3
1
WS2812B-2020
LED1
1
MBR120VLSFT1G
D1
5
10uF
C1, C2, C3, C4, C5
1
22uF
C6
3
100nF
C7, C9, C10
1
1uF
C8
Show 6 more
QtyPartRefs
2
5.1k
R1, R2
3
10k
R3, R4, R13
4
100k
R5, R8, R9, R10
2
470k
R6, R7
1
1k
R11
1
330R
R12

Open telegraph design files

The KiCad project lives in the animesh-chouhan/open-telegraph repository on GitHub; these links point at the commit this page was built from.

Open telegraph: common questions

What microcontroller does the Open telegraph use?

The Open telegraph is built around the ESP32-S3-WROOM-1-N8, from the ESP32 family.

How big is the Open telegraph PCB?

The Open telegraph measures 48 × 65.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Open telegraph?

39 components, from 26 distinct parts. The full bill of materials is listed on this page.

Where can I download the Open telegraph design files?

From the animesh-chouhan/open-telegraph repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Open telegraph design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which animesh-chouhan chose for the repository.

Can I test firmware for the Open telegraph 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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