2 layers51.1 × 95 mm Talk e, the printed circuit board in 3D

Talk e

📻 — A simple LoRa-based talkie-walkie built on ESP32, operating on the 433 MHz frequency band for long-range, low-power wireless communication.

Open in PCBKit

Size: 51.1 × 95 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 75
Nets: 76
Pads: 288
Tracks, vias: 594, 175
Pours: 3
Routed: Yes
KiCad: KiCad 10.0 (file 20260206)
Created: 4 May 2026
Updated: 14 Sep 2026

Overview

Talk e is an open-source printed circuit board by milovanpms, from the milovanpms/talk-e repository on GitHub. It is a 2-layer board of 51.1 × 95 mm with 75 parts on 76 nets, routed with 594 tracks and 175 vias.

It is built around the ESP32-S3-WROOM-1-N8, AP2112K-3.3 and DW01A, with the RFM96W-433S2, TP4056-42-ESOP8 and BC337 among its other parts. Its parts include 24 capacitors, 18 resistors, 14 connectors, 7 ICs and 3 transistors. It belongs with the radio and wireless boards and the ESP32 boards of this library.

Main components

README

README.md

Talk-E is a walkie-talkie powered by LoRa and an ESP32-S3, operating on the 433 MHz band. And it mostly works.

milovan.me

In a nutshell

What : Two identical devices, one button to talk, and that's it.
Why : We didn't have much time, so we wanted something original, interactive, and fun to demo. The kind of project you understand immediately just by holding it in your hands.
Context : Radiocommunication student project, two-person team.

Documentation

The documentation is quite detailed, so each part has its own page instead of having it all here.

Find your happiness:

⚙️ Hardware Architecture: Functional synoptic diagram and component details
🛠️ Firmware: ESP-IDF, libraries, code architecture
📡 Radio Parameters: How we use LoRa
🎙️ Audio Processing: A voice's journey through the system
👤 Human-Machine Interface: How does it works for the user
🔋 Power Supply Circuit: Power management and energy consumption
🔌 Electronics: Prototyping, KiCad, RF design, routing rules, our conception choices
📐 Mechanical Design: Our vision of an enclosure for this device

Repository Structure

text

├── hardware/        # KiCad schematics, PCB
├── firmware/        # ESP-IDF code
├── docs/            # Documentation, conception notes
├── assets/          # Images, schematics and illustrations
└── case/            # 3D models

Parts

Qty	Value	Footprint	References
17	100n	Capacitor_SMD:C_0805_2012Metric	C1, C2, C3, C6, C7, C8, C10, C11, C13, C15, C18, C19, C20, C21, C22, C24 +1
7	Conn_01x02_Socket	Connector_JST:JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical	J2, J5, J6, J7, J10, J12, J13
5	10µ	Capacitor_SMD:C_0805_2012Metric	C5, C12, C14, C16, C17
4	10k	Resistor_SMD:R_1206_3216Metric	R4, R5, R13, R16
4	1k	Resistor_SMD:R_1206_3216Metric	R3, R8, R9, R12
3	100k	Resistor_SMD:R_1206_3216Metric	R10, R17, R18
3	330R	Resistor_SMD:R_1206_3216Metric	R6, R7, R15
2	4.7k	Resistor_SMD:R_1206_3216Metric	R1, R2
2	Conn_01x03_Socket	Connector_JST:JST_EH_B3B-EH-A_1x03_P2.50mm_Vertical	J8, J11
2	Conn_01x04_Socket	Connector_JST:JST_EH_B4B-EH-A_1x04_P2.50mm_Vertical	J3, J4
2	LOGO	LOGO	G*, G*
2	SW_Push	Button_Switch_THT:SW_PUSH_6mm	BOOT, RESET
1	100R	Resistor_SMD:R_1206_3216Metric	R11
1	100µ	Capacitor_SMD:C_0805_2012Metric	C4
1	1N4148	Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal	D1
1	1N5819	Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal	D2
1	3006	3006:MODULE_3006	U7
1	47k	Resistor_SMD:R_1206_3216Metric	R14
1	47µ	Capacitor_SMD:C_0805_2012Metric	C23
1	AP2112K-3.3	Package_TO_SOT_SMD:SOT-23-5	U5
1	BC337	Package_TO_SOT_THT:TO-92_Inline	Q1
1	Conn_01x02	Connector_JST:JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical	J9
1	Conn_02x04_Odd_Even	Connector_PinHeader_2.54mm:PinHeader_2x04_P2.54mm_Vertical	PROG
1	Conn_Coaxial	Connector_Coaxial:SMA_Amphenol_901-143_Horizontal	J1
1	DW01A	Package_TO_SOT_SMD:SOT-23-6	U4
1	ESP32-S3-WROOM-1	RF_Module:ESP32-S3-WROOM-1	U1
1	FS8205A	FS8205A:SOP65P640X120-8N	Q3
1	IRLML6402	Package_TO_SOT_SMD:SOT-23	Q2
1	RFM96W-433S2	RFM96W-433S2:MODULE_RFM96W-433S2	U6
1	SBR130S3-7	SBR130S3-7:SBR130S3-7	U3
1	TP4056-42-ESOP8	Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm	U2
1	USB_B_Micro	Connector_USB:USB_Micro-AB_Molex_47590-0001	J15

The 73 most common of 75 parts.

Questions

How big is the Talk e PCB?

It measures 51.1 × 95 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Talk e use?

75 parts, built around the ESP32-S3-WROOM-1-N8, AP2112K-3.3, DW01A and RFM96W-433S2. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Talk e KiCad files?

From the milovanpms/talk-e repository on GitHub, at the commit this page was made from: the board is hardware/talk-e/talk-e.kicad_pcb and its schematic hardware/talk-e/ihm.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Talk e design in my own project?

Its repository states no licence, so its author keeps all rights: ask milovanpms before reusing the design.

Category and platform

Radio and wireless ESP32

Topics

433 433mhz c embedded embedded-c embedded-systems esp32 lora sx1278 sx127x

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/milovanpms-talk-e" title="Talk e in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/milovanpms-talk-e.jpg" alt="Talk e" width="1200" height="900">

A picture that opens the board, for a README

[![Talk e](https://pcbkit.io/embed/boards/milovanpms-talk-e.jpg?size=s)](https://pcbkit.io/boards/milovanpms-talk-e)

Source

Repository: milovanpms/talk-e
Board file: hardware/talk-e/talk-e.kicad_pcb
Commit: b38a70a
Licence: Not stated

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