4 layers51.2 × 40 mm Sensor telemetry board, the printed circuit board in 3D

Sensor telemetry board

Custom 4-layer STM32F411 sensor board with bare-metal firmware and a FreeRTOS telemetry pipeline

Size: 51.2 × 40 mm
Copper layers: 4
Thickness: 1.6 mm
Parts: 42
Nets: 86
Pads: 219
Tracks, vias: 333, 94
Pours: 2
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 30 Jun 2026
Updated: 8 Jul 2026

Overview

Sensor telemetry board is an open-source printed circuit board by saadafsy, from the saadafsy/stm32-sensor-pcb repository on GitHub, published under the MIT licence. It is a 4-layer board of 51.2 × 40 mm with 42 parts on 86 nets, routed with 333 tracks and 94 vias.

It is built around the BME280, AMS1117-3.3 and USBLC6-2SC6. Its parts include 19 capacitors, 7 resistors, 5 ICs, 3 connectors and 1 diode. It belongs with the sensors and measurement boards and the STM32 boards of this library.

Main components

README

hardware/README.md

Hardware

Custom 4-layer PCB designed in KiCad 9 (stackup: F.Cu / inner GND / inner +3V3 / B.Cu).

sensor-telemetry-board.kicad_pro - project
sensor-telemetry-board.kicad_sch - schematic
sensor-telemetry-board.kicad_pcb - 4-layer layout

Key parts

Ref	Part	Role
U1	STM32F411CEU6	MCU (Cortex-M4F, 100 MHz)
U?	BME280	temperature / humidity / pressure over I2C
U?	CP2102N	USB-C to UART bridge
U?	AMS1117-3.3	3.3 V LDO
U?	USBLC6-2	USB data-line ESD protection
Y1	8 MHz crystal	HSE reference for the 100 MHz PLL

Status

Design complete and DFM-validated (POFV across all vias); Gerbers, BOM, and CPL can be regenerated from this project for a JLCPCB PCBA order. The board is in shipping and will be brought up soon (see the top-level README for status).

To export fabrication files: open the project in KiCad and run the Fabrication Toolkit plugin, or export Gerbers / drill / BOM / CPL manually from the PCB and schematic editors.

Category and platform

Sensors and measurement STM32

Project files

Show this board on your page

https://pcbkit.io/boards/saadafsy/stm32-sensor-pcb

The board's own page, for a message or a post.

Source

Repository: saadafsy/stm32-sensor-pcb
Board file: hardware/sensor-telemetry-board.kicad_pcb
Commit: 9e11f68
Licence: MIT

Parts

Qty	Value	Footprint	References
12	100n	Capacitor_SMD:C_0402_1005Metric	C1, C3, C6, C7, C8, C9, C10, C15, C16, C17, C18, C19
4	MountingHole_3.2mm_M3	MountingHole:MountingHole_3.2mm_M3	H1, H2, H3, H4
2	1k	Resistor_SMD:R_0402_1005Metric	R3, R4
2	3.3k	Resistor_SMD:R_0402_1005Metric	R5, R6
2	30p	Capacitor_SMD:C_0402_1005Metric	C4, C5
2	5.1k	Resistor_SMD:R_0402_1005Metric	R1, R2
1	10k	Resistor_SMD:R_0402_1005Metric	R7
1	10u	Capacitor_SMD:C_0805_2012Metric	C14
1	1u	Capacitor_SMD:C_0402_1005Metric	C11
1	2.2u	Capacitor_SMD:C_0603_1608Metric	C12
1	22u	Capacitor_SMD:C_0805_2012Metric	C13
1	4.7u	Capacitor_SMD:C_0603_1608Metric	C2
1	AMS1117-3.3	Package_TO_SOT_SMD:SOT-223-3_TabPin2	U2
1	BME280	Package_LGA:Bosch_LGA-8_2.5x2.5mm_P0.65mm_ClockwisePinNumbering	U4
1	CP2102N-Axx-xQFN28	Package_DFN_QFN:QFN-28-1EP_5x5mm_P0.5mm_EP3.35x3.35mm	U3
1	Conn_01x04	Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical	J3
1	Conn_01x05	Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical	J2
1	Crystal_GND24	Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm	Y1
1	FerriteBead	Inductor_SMD:L_0603_1608Metric	FB1
1	LED	LED_SMD:LED_0603_1608Metric	D1
1	STM32F411RETx	Package_QFP:LQFP-64_10x10mm_P0.5mm	U1
1	SW_Push	Button_Switch_SMD:SW_SPST_PTS645Sx43SMTR92	SW1
1	USBLC6-2SC6	Package_TO_SOT_SMD:SOT-23-6	U5
1	USB_C_Receptacle_USB2.0_16P	Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12	J1

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Questions

How big is the Sensor telemetry board PCB?

It measures 51.2 × 40 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Sensor telemetry board use?

42 parts, built around the BME280, AMS1117-3.3 and USBLC6-2SC6. 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 Sensor telemetry board KiCad files?

From the saadafsy/stm32-sensor-pcb repository on GitHub, at the commit this page was made from: the board is hardware/sensor-telemetry-board.kicad_pcb and its schematic hardware/sensor-telemetry-board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Sensor telemetry board design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).