2 layers65 × 30 mm StratoZero, the printed circuit board in 3D

StratoZero

StratoZero Raspberry Pi Zero Hat for High Altitude Balloon missions

Size: 65 × 30 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 42
Nets: 50
Pads: 176
Tracks, vias: 388, 56
Pours: 2
Routed: Yes
KiCad: KiCad 5 (file 20171130)
Created: 15 May 2017
Updated: 21 May 2025

Overview

StratoZero is an open-source printed circuit board by ladecadence, from the ladecadence/StratoZero repository on GitHub. It is a 2-layer board of 65 × 30 mm with 42 parts on 50 nets, routed with 388 tracks and 56 vias.

It is built around the MCP3002-I/P, DS18B20 and DS3231MZ+, with the LM2940S-5.0 among its other parts. Its parts include 10 resistors, 7 capacitors, 7 connectors, 6 ICs and 4 diodes. It belongs with the radio and wireless boards of this library.

Main components

README

README.md

StratoZero

StratoZero Board

StratoZero is a Raspberry Pi Zero hat for use in High Altitude Balloon missions. It uses a RFM95 LoRa radio module, ds18b20 temperature sensors, a mcp3002 SPI ADC to monitor the battery, a MS5607 barometer, and several connectors for GPS, I2C, analog inputs, and more.

Check BOM File for components.

This board is designed to be used with the EkiGo flight software: https://github.com/ladecadence/EkiGo

Component changes

Initial tests with the original voltage regulator showed brownouts, so now I'm using an MIC39100-5 and it works perfect (same footprint).
DS3231 and it's battery come from the small and cheap RTC modules you can find on ebay or aliexpress.

Parts

Qty	Value	Footprint	References
6	10K	Resistors_SMD:R_0603_HandSoldering	R3, R5, R6, R7, R8, R10
3	D	Resistors_SMD:R_0805_HandSoldering	D1, D2, D3
2	100n	Capacitors_SMD:C_0603	C2, C6
2	LOGO	ladecadence:ASHAB-LOGO-FSILK	G*, G*
1	100R	Resistors_SMD:R_0603_HandSoldering	R2
1	100n	Capacitor_SMD:C_0603_1608Metric	C7
1	100n	Capacitors_SMD:C_0805	C3
1	1WIRE	Connectors_Hirose:Hirose_DF13-03P-1.25DSA_03x1.25mm_Straight	P5
1	1u	Capacitors_SMD:C_0805	C5
1	22K	Resistors_SMD:R_0603_HandSoldering	R4
1	2N7002	TO_SOT_Packages_SMD:SOT-23	Q1
1	390	Resistors_SMD:R_0603_HandSoldering	R9
1	470n	Capacitors_SMD:C_0805	C1
1	4K7R	Resistors_SMD:R_0603_HandSoldering	R1
1	AN1	Connectors_Hirose:Hirose_DF13-03P-1.25DSA_03x1.25mm_Straight	P4
1	BATT	Connectors_Hirose:Hirose_DF13-02P-1.25DSA_02x1.25mm_Straight	P3
1	Battery_Cell	ladecadence:RTC-Batt	BT1
1	CP	Capacitors_Tantalum_SMD:TantalC_SizeA_EIA-3216_HandSoldering	C4
1	DS3231M	Package_SO:SOIC-16W_7.5x10.3mm_P1.27mm	U6
1	GP1	Connectors_Hirose:Hirose_DF13-03P-1.25DSA_03x1.25mm_Straight	P7
1	GPS	Connectors_Hirose:Hirose_DF13-04P-1.25DSA_04x1.25mm_Straight	P1
1	I2C	Connectors_Hirose:Hirose_DF13-04P-1.25DSA_04x1.25mm_Straight	P2
1	LED	LEDs:LED_0603	D4
1	LM2940	TO_SOT_Packages_SMD:SOT-223	U1
1	LOGO	Banana:Banana	G***
1	MCP3002	SMD_Packages:SOIC-8-N	U3
1	MS5607	ladecadence:MS5607	U5
1	RFM95HW	StratoZero:RFM95_SMD_Handsoldering	U2
1	RF_PWR	Pin_Headers:Pin_Header_Straight_1x03	JP1
1	RPI-GPIO	ladecadence:RPI-ZERO-Hat	P6
1	SMA_EDGE	SMA:SMA_EDGE	SMA_E1
1	Symbol_OSHW-Logo_SilkScreen	Symbols:Symbol_OSHW-Logo_SilkScreen
1	ds18b20	TO_SOT_Packages_THT:TO-92_Inline_Wide	U4

Questions

How big is the StratoZero PCB?

It measures 65 × 30 mm and has 2 copper layers, 1.6 mm thick.

What parts does the StratoZero use?

42 parts, built around the MCP3002-I/P, DS18B20, DS3231MZ+ and LM2940S-5.0. 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 StratoZero KiCad files?

From the ladecadence/StratoZero repository on GitHub, at the commit this page was made from: the board is StratoZero.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the StratoZero design in my own project?

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

Category and platform

Radio and wireless

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/ladecadence-stratozero" title="StratoZero 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/ladecadence-stratozero.jpg" alt="StratoZero" width="1200" height="900">

A picture that opens the board, for a README

[![StratoZero](https://pcbkit.io/embed/boards/ladecadence-stratozero.jpg?size=s)](https://pcbkit.io/boards/ladecadence-stratozero)

Source

Repository: ladecadence/StratoZero
Board file: StratoZero.kicad_pcb
Commit: 31d46b0
Licence: Not stated

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