4 layers25.8 × 62.7 mm
PulseboardS3
I-s-h-a-n-C/PulseboardS3
This is an ESP32 S3 Devboard, designed to be used in conjunction with EMGs and EKGs. As with all ESP32S3 Devboards, it has WiFi and Bluetooth capibilities.
31 parts
4 layers44.5 × 62.8 mm
ESP32-Sen
SendhanS/ESP32-Sen1A compact ESP32-S3-MINI-1-N8 development board with USB-C (ESD protected), a 4-layer PCB stack-up (signal / GND / power / signal), and 3.3 V regulation using the TLV75801. Includes GPIO buttons, a WS2812B status LED, and space for an onboard I²C OLED breakout.
- Size
- 44.5 × 62.8 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 33
- Nets
- 55
- Pads
- 222
- Tracks, vias
- 538, 143
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 31 Dec 2025
- Updated
- 31 Dec 2025
Overview
ESP32-Sen is an open-source printed circuit board by SendhanS, from the SendhanS/ESP32-Sen repository on GitHub, published under the CC0-1.0 licence. It is a 4-layer board of 44.5 × 62.8 mm with 33 parts on 55 nets, routed with 538 tracks and 143 vias.
It is built around the ESP32-S3-MINI-1-N8, ESD7104MUTAG and TLV75801PDRV, with the WS2812B among its other parts. Its parts include 10 resistors, 9 capacitors, 3 ICs, 3 connectors and 2 diodes. It belongs with the ESP32 boards of this library.
Main components
4
ESP32-S3-MINI-1-N8
SMD-104.5dBm -40℃~+85℃ 2.4GHz 20.5dBm 330mA 3V~3.6V 97mA Bluetooth5.0 ESP32-S3FN8 Chip On-board PCB Antenna UART、SPI、I2C、I2S、USB SMD WiFi Modules ROHSEspressif SystemsWiFi Modules
ESD7104MUTAG
DFN2510-10-55℃~+125℃ 0.2pF、0.4pF 18V 200nA 3A@8/20us 5V 60W@8/20us 7.5V Four channels IEC 61000-4-2、IEC 61000-4-5 DFN2510-10 ESD and Surge Protection (TVS/ESD) ROHSTECH PUBLICESD And Surge Protection (TVS/ESD)
TLV75801PDRV
WSON-6-EP(2x2)-40℃~+125℃@(Tj) 1 31uA 500mA 50dB@(1kHz) 53uVrms 550mV~5.5V 6V Adjustable Positive Under Voltage Lockout、Over Current Protection、Soft Start、Thermal Shutdown WSON-6-EP(2x2) Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
WS2812B
5mm X 5mm Surface Mount RGB LED with Intelligent ControlWorldsemiUncategorised
README
README.mdESP32-Sen
A compact ESP32-S3-MINI-1-N8 development board with USB-C (ESD protected), a 4-layer PCB stack-up (signal / GND / power / signal), and 3.3 V regulation using the TLV75801. Includes GPIO buttons, a WS2812B status LED, and space for an onboard I²C OLED breakout. The board is intended for learning, experimentation, and portfolio demonstration of embedded systems and PCB design practices. Status: Not yet tested. The design is functional in theory but may require revisions and improvements after bring-up.
Overview
This board provides a clean ESP32-S3 core with USB-C connectivity, proper ESD protection, a structured 4-layer PCB stack-up, and expansion options for basic UI and peripherals. The goal was to move beyond simple 2-layer hobby boards and design something closer to real-world embedded hardware.
Key Features
ESP32-S3-MINI-1-N8 module
USB-C connector (USB4105)
Differential USB D+ / D− routing
ESD protection using D3V3XA4B10LP TVS diodes
TLV75801 linear regulator (5 V USB → 3.3 V)
4-layer PCB stack-up:
Top: Signal + components
Inner 1: Solid GND plane
Inner 2: Power plane (3.3 V)
Bottom: Signal routing
WS2812B RGB status LED
BOOT and RESET buttons
Two additional GPIO buttons (GPIO4, GPIO5)
Power Architecture
Primary power input via USB-C (5 V)
Onboard TLV75801 LDO generates 3.3 V for ESP32 and peripherals
3.3 V rail is exposed on headers for external devices
Design allows future extension for alternative power input with minor modifications
I²C header and reserved space for a 0.91" OLED display module
GPIO headers for expansion
USB Design Notes
USB D+ and D− routed as a differential pair
Length-matched and impedance-aware routing
ESD protection placed close to the USB connector
Intended for USB device mode (programming and serial communication)
I²C and Display Support
Dedicated I²C header (3.3 V logic)
PCB space reserved for a common 0.91" 128×32 I²C OLED module
Display is optional and not populated by default
Known Limitations / Future Improvements
Board has not been fabricated or tested yet
No battery power or charging circuit
No current measurement or power monitoring
Firmware bring-up examples not included yet
OLED mounting footprint may need adjustment depending on module vendor
Parts
33| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C1, C3, C4, C5, C8, C9 |
| 5 | 10k | Resistor_SMD:R_0603_1608Metric | R3, R4, R5, R9, R10 |
| 3 | 10uF | Capacitor_SMD:C_0603_1608Metric | C2, C6, C7 |
| 3 | 5.1k | Resistor_SMD:R_0603_1608Metric | R1, R2, R8 |
| 2 | SW_MEC_5E | Button_Switch_SMD:SW_SPST_PTS810 | SW1, SW2 |
| 2 | ~ | Button_Switch_SMD:SW_SPST_PTS810 | BOOT1, RESET1 |
| 2 | ~ | Connector_PinHeader_2.54mm:PinHeader_1x22_P2.54mm_Vertical | J1, J3 |
| 1 | 1M | Resistor_SMD:R_0603_1608Metric | R6 |
| 1 | 200k | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | ESD7104MUTAG | Package_DFN_QFN:Diodes_UDFN-10_1.0x2.5mm_P0.5mm | U2 |
| 1 | ESP32-S3-MINI-1-N8 | ESP32-S3-MINI-1-N8:XCVR_ESP32-S3-MINI-1-N8 | U1 |
| 1 | I2C Port | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J2 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D2 |
| 1 | LOGO | LOGO | G*** |
| 1 | TLV75801PDRV | Package_SON:WSON-6-1EP_2x2mm_P0.65mm_EP1x1.6mm | U3 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | JUSB1 |
| 1 | WS2812B | LED_SMD:LED_WS2812B_PLCC4_5.0x5.0mm_P3.2mm | D1 |
Questions
How big is the ESP32-Sen PCB?
It measures 44.5 × 62.8 mm and has 4 copper layers, 1.6 mm thick.
What parts does the ESP32-Sen use?
33 parts, built around the ESP32-S3-MINI-1-N8, ESD7104MUTAG, TLV75801PDRV and WS2812B. 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 ESP32-Sen KiCad files?
From the SendhanS/ESP32-Sen repository on GitHub, at the commit this page was made from: the board is ESP32_Sen.kicad_pcb and its schematic ESP32_Sen.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the ESP32-Sen design in my own project?
Its repository publishes it under the CC0-1.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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