2 layers140 × 60 mm
Flight computer
Serra-Rocketry/flight-computer
[Telemetry] Onboard flight computer for rocket avionics.
44 partsMIT
2 layers130 × 100 mm
Restore backup 2026-08-18T23-50-42-462
Serra-Rocketry/flight-computer[Telemetry] Onboard flight computer for rocket avionics.
- Size
- 130 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 55
- Pads
- 92
- Tracks, vias
- 26, 0
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 4 Nov 2025
- Updated
- 5 Nov 2026
Overview
Restore backup 2026-08-18T23-50-42-462 is an open-source printed circuit board by Serra-Rocketry, from the Serra-Rocketry/flight-computer repository on GitHub, published under the MIT licence. It is a 2-layer board of 130 × 100 mm with 11 parts on 55 nets, routed with 26 tracks and 0 vias.
It is built around the ESP32-S3-DEVKITC-1-N8R2, BMP585 and RFM95W-915S2, with the BC547 among its other parts. Its parts include 4 ICs, 1 resistor, 1 transistor, 1 connector and 1 switch. It belongs with the ESP32 boards of this library.
Main components
4ESP32-S3-DEVKITC-1-N8R2
-- WiFi Modules ROHSEspressif SystemsWiFi Modules
BMP585
LGA-9(3.3x3.3)-40℃~+85℃ 0.5pa/K 1.5uA 1.71V~3.6V 30Kpa~1.25bar 30pa 6pa I2C、SPI On-chip temperature compensation、Integrated ADC and digital interface、Standby mode、On-chip temperature output Yes LGA-9(3.3x3.3) Pressure Sensors ROHSBosch SensortecPressure Sensors
RFM95W-915S2
LCC-16_16X16mmLCC-16_16X16mm New Arrivals ROHSHopeRF Micro-electronicsUncategorised
BC547
TO-92Bipolar (BJT)Jiangsu Changjing Electronics Technology (CJ)
README
README.mdAvionics — Onboard Computer
v2.0 Flight Computer for Serra Rocketry (#11 - Dedalo).
OOP + FreeRTOS + 4-state FSM, validated against real flight data. Built for the ESP32-S3.
Overview
Real-time avionics firmware for a sounding rocket. Runs on an ESP32-S3 under FreeRTOS, reading barometric (BMP585), inertial (LSM6DS3) and GPS (NEO-8M) sensors to detect flight events and deploy the parachute at apogee.
- Flight state machine: IDLE → ASCENT → DESCENT → LANDED, with sub-event flags (liftoff, burnout, apogee, freefall, parachute)
- Parachute deployment: Apogee + stable negative Vz, 3-cycle confirmation, 50 m ground guard — validated against RocketPy + real flight data points
- Telemetry: 22-field CSV over LoRa @ 915 MHz to ground receiver
- Logging: SD card (primary) with LittleFS flash fallback
- Safety: NaN/Inf rejection, sensor fallback, TWDT watchdog, multi-condition parachute logic
Architecture
firmware/
├── firmware.ino # setup()/loop() — orchestrates init*Task()
├── config.h # Pins, thresholds, radio parameters
├── sensors/ # ISensor implementations (BMP585, LSM6DS3, GPS)
├── flight/ # FreeRTOS tasks + FlightStateMachine
├── modules/ # Actuators/peripherals (servo, LoRa, buzzer, FS)
└── docs/architecture.md # v2.0 architecture (consolidated from REFACTORING_PLAN.md)Two FreeRTOS cores with queue-based communication:
| Core | Task | Priority | Rate | Responsibility |
|---|---|---|---|---|
| 1 | FlightControlTask | 20 | 5 Hz | Sensors + FSM + parachute + watchdog |
| 0 | TelemetryTask | 5 | 5 Hz | GPS enrichment + LoRa + file + Serial |
| 0 | LoggerTask | 1 | — | Async log queue with level filter |
Quick Start
Arduino IDE (recommended)
- Board: ESP32-S3 Dev Module (enable "USB CDC On Boot")
- Open
firmware/firmware.ino - Install libraries:
Adafruit BMP5xx,Adafruit LSM6DS3,TinyGPS++,ESP32Servo,LoRa by Sandeep Mistry - Compile (
Ctrl+R) and upload (Ctrl+U)
Validate without hardware
python3 extras/FSM_tester/FSM_Tester.py # FSM against 1,873 real data points
python3 extras/validate_telemetry_format.py # 22-field telemetry alignmentKey Specifications
| Parameter | Value |
|---|---|
| FlightControl rate | 5 Hz (200 ms) |
| Telemetry rate | 5 Hz (200 ms) |
| Parachute confirm | 3 consecutive Vz < −2 m/s |
| Ground guard | 50 m AGL |
| LoRa frequency | 915 MHz (Brazil/Americas ISM) |
| LoRa config | SF7, BW 125 kHz, CR 4/5, CRC on, +17 dBm |
| Storage | SD card (SPI) → LittleFS fallback |
| Sensor queue | 25 slots (∼2.4 KB) |
| Log queue | 50 slots (∼7.2 KB) |
Documentation
docs/software.md— Software architecture |-docs/hardware.md— Hardware specs, pinout, BOM |-docs/architecture.md— Architecture spec (consolidated) |-docs/modules.md— Module reference |-docs/flowchart.md— FreeRTOS + FSM flow diagramAGENTS.md— AI agent coding guideCONTRIBUTING.md— How to contribute
Repository Layout
firmware/ v2.0 firmware (OOP + FreeRTOS + FSM)
test/ Hardware validation sketches (sensors, servo, FSM)
docs/ software.md, hardware.md, telemetry-format.md, flowchart.md
hardware/ KiCad schematic + PCB + BOM
extras/ Scripts, FSM tester, format validator, emergency deployStatus
All refactoring plan phases are complete — v2.0 is fully implemented and
documented. See CHANGELOG.md for the full release history.
Team
Serra Rocketry — IPRJ/UERJ
License
This project is licensed under the MIT License - see the LICENSE file for details.
Parts
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | Parachute_Servo | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | M1, M2 |
| 1 | 1k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1 |
| 1 | BC547 | Package_TO_SOT_THT:TO-92_Inline | Q1 |
| 1 | BMP585 | electronics:BMP585 | U2 |
| 1 | Buzzer | Buzzer_Beeper:Buzzer_12x9.5RM7.6 | BZ1 |
| 1 | Conn_Coaxial_Small | Connector_Coaxial:BNC_TEConnectivity_1478204_Vertical | J1 |
| 1 | ESP32-S3-DEVKITC-1-N8R2 | ESP32-S3-DEVKITC-1-N8R8:ESP32-S3-DEVKITC-1-N8R8 | U5 |
| 1 | RBF | Button_Switch_THT:SW_XKB_DM1-16UP-1 | SW1 |
| 1 | RFM95W-915S2 | RF_Module:HOPERF_RFM9XW_THT | U1 |
| 1 | SD Card mini module | electronics:SD Card mini module | U4 |
Questions
How big is the Restore backup 2026-08-18T23-50-42-462 PCB?
It measures 130 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Restore backup 2026-08-18T23-50-42-462 use?
11 parts, built around the ESP32-S3-DEVKITC-1-N8R2, BMP585, RFM95W-915S2 and BC547. 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 Restore backup 2026-08-18T23-50-42-462 KiCad files?
From the Serra-Rocketry/flight-computer repository on GitHub, at the commit this page was made from: the board is hardware/electronics/electronics/_restore_backup_2026-08-18T23-50-42-462/electronics.kicad_pcb and its schematic hardware/Telemetria Foguete/Telemetria Foguete.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Restore backup 2026-08-18T23-50-42-462 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).
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