Builds on HPR Rocket Flight Computer by SparkyVT

DESCRIPTION

This flight computer is designed for rockets 38mm in diameter or greater, and will fit inside a 38mm tube coupler.
Dimensions: 4.0in x 1.25in x 0.5in, antenna configuration may add more length
It has similar capability as a TeleMega, but without a smart-phone app or advanced interfaces
Flight-tested on multiple M-and-N powered supersonic flights to over 34K feet and Mach 2.3.
For large or high-power projects, a commercially available backup computer is strongly recommended.

FEATURES

• Full-featured dual deploy/multi-stage/airstart rocket flight computer capable to 100,000ft or more
• Tilt-sensing lockout for ignition of second stages and/or airstarts
• Live telemetry over 433MHz or 915MHz LoRa (433MHz: USA amateur 70cm band, EUR license free) (915MHz: USA license free)
• 4 high-current pyro outputs with continuity checks
• Advanced MEMS sensor package: GNSS, accelerometers, gyroscope, magnetometer, barometer, and LoRa radio
• High Data-Capture rate: approximately 50,000 samples per second recorded to SD card
  • 1000Hz 3-axis digital 24G and 100G accelerometer data logging
  • 1000Hz 3-axis digital 2000dps gyroscope data logging
  • 1000Hz of flight events & continuity data logging
  • 1000Hz of sensor-fuzed speed & altitude
  • 100Hz of pitch, yaw, roll rotation
  • 40Hz of magnetic data logging and magnetic roll
  • 30Hz-100Hz of digital barometric data logging (Altitude, pressure, temperature)
  • 30Hz of main battery voltage (1400Hz during pyro events)
  • 20Hz of LoRa telemetry output (time, event, acceleration, speed, altitude, rotation, GNSS position, signal strength)
  • 5Hz-25Hz of GNSS data logging (chip-dependent data rates & constellations)
  • Separate data file for each flight up to 100 flights
  • Optional separate GNSS NMEA capture file for plotting in Google Earth, UBLOX NEO-M9N configuration approved for TRA altitude record attempts
• Simple, easy-to-use configuration interface through the SD card
  • User Selectable Flight Mode: Single-Stage, Two-Stage, Airstart, or Booster
  • Configurable Apogee delay
  • Optional Audible Battery Voltage report at startup
  • Optional Magnetic Switch Startup & Shut-down
  • Preflight audible reporting options: Perfectflight or Marsa
  • User selectable telemetry frequency & power settings
  • 8 configurable servo outputs (4 powered, 4 un-powered)
  • User selectable inflight brownout recovery
• Mach immune, sensor-fusion based apogee event
• Barometric based main deploy event
• Audible pre-flight continuity report
• Audible Post-flight max altitude & speed report
• Mount in any orientation, automatic orientation detection with built-in self calibration mode
• Bench-test mode activated w/ tactile button; user configurable status messages over USB Serial
• Report in SI or Metric units
• Compatible with Teensy 3.2, 3.5, 3.6, 4.0, 4.1
  • Connect any sensor to any available I2C or SPI bus
  • Create your own custom setup with configurable pins for continuity, firing, and servos
  • Connect UBLOX GPS unit to any available HW Serial port

FLIGHT COMPUTER COMPONENTS

• Microprocessor: Teensy 4.1, 3.5, or 3.6 (compatible with provided PCB file) or Teensy 4.0/3.2 (no PCB file provided)
• IMU: LSM6DS0X (recommended), LSM9DS1, LSM6DS33, MPU6050, or LSM303 & L3GD20H combo
• Magnetometer: LIS3MDL (recommended), LSM9DS1, or LSM303
• 100G Accelerometer: H3LIS331DL (recommended), ADXL377, or ADXL377 & ADS1115 combo
• Pressure Sensor: MS5611 (recommended), MS5607, MPL3115A2, BMP180, BMP280, or BMP388 (Note: BMP280 & BMP388 incompatible with telemetry due to EMI)
• GNSS: UBLOX M6, M7, M8, M9 (NEO footprint supported in PCB file) or Adafruit Ultimate GPS
• LoRa Telemetry: RFM96W or RFM95W, both capable of TX on 433MHz or 915MHz (433MHz USA: Amateur License Required, EUR: License Free)

GROUND STATION COMPONENTS

• MCU: Arduino Nano 33 BLE
• Telemetry: RFM96W 433MHz (USA: Ham License Required, EUR: License Free) or RFM95W 915MHz (USA: License Free)
• GPS: Ublox SAM-M8Q (optional)
• IMU: Sparkfun LSM9DS1 breakout
• LCD: 20X4 Sparkfun LCD
• SD Card: Adafruit SD Card breakout board
• Antenna: 433Mhz 5-element Yagi (Ham Only) or 900Mhz (License Free)

ADDITIONAL LIBRARIES REQUIRED

• TinyGPS++
• SDfat and/or SD

HARDWARE OPTIONS

• OPTION 1: Assemble the unit yourself. Purchase a Teensy 4.0 or 4.1 and integrate the system with commercially available sensor breakout boards. If you want to use high-current pyro outputs, then it is up to you to develop the continuity and firing circuitry. I have threaded standoffs and screws that are a perfect fit for the Adafruit breakout boards.
• OPTION 2: Contact me for a custom Teensy breakout board and add your own sensors. The breakout includes a Teensy 4.1, integrates 4x high-current pyro outputs, and 6 easy-to-use terminal blocks to integrate into your high-power rocket. Includes Qwiic connector to easily integrate your custom sensor package over I2C.
• OPTION 3: Contact me for a fully-functional Frankenstein-board. This integrates all sensors breakout boards onto a single main board that is 4.0 x 1.25 x 0.5 inches. Comes fully assembled, pre-programmed, calibrated, and tested. Configurations will vary, but quality will not.
• OPTION 4: Try your hand at assembling the Frankenstein-board yourself. This is a single bare-board with no breakouts attached. You will need to reflow the GNSS chip and hand-solder approximately 30 components. Instructions included. Contact me for for a bare-board.
• OPTION 5: Contact me for a fully assembled and tested ground station. Includes ground unit with 2 radios and 20x4 LCD mounted in a custom form-fitting box.