MRAS (Multi Rocket Avionics System) is a flight computer that contains a high-performance microcontroller, high-G accelerometer, Inertial Measurement Unit (IMU), Magnetometer, GNSS receiver, Barometer, and a Telemetry system. It has been designed to provide a robust and reliable avionics package that can be used in high-powered rockets. The system uses a combination of sensors to determine the rocket's position, velocity and attitude, and logs this data for post-flight analysis. The software is designed to work with a variety of sensor hardware and can be easily integrated into existing rocket projects.

Supported hardware

MRAS-DART v1

The MRAS-DART v1 is a complete rocket avionics package that is designed to fit within a 38mm ID body tube.

Teensy 4.1 development board was chosen as the microcontroller for the MRAS-DART v1 system, due to its high-performance, large number of I/O pins and built-in SD card slot
A high-G accelerometer, Analog Devices ADXL375, was included in the design to measure the acceleration caused by the motor burn
An Inertial Measurement Unit (IMU), STMicroelectronics LSM6DSO32, was also included for position estimation (Sensor_LSM6DSO32)
A Magnetometer, STMicroelectronics LIS3MDL, was added to the design to determine the rocket’s orientation in space (Sensor_LIS3MDL)
u-blox ZOE-M8Q was selected as the GNSS receiver for its battery-backed RTC, 72-channel support and fast GPS acquisition performance (Sensor_ZOEM8Q)
A Barometer, TE Connectivity MS5607, was included in the design to determine altitude by measuring pressure and temperature, and for its high pressure range (Sensor_MS5607)
RF Solutions LAMBDA62 Module was chosen for telemetry as it allows for long-range, low-cost, spread-spectrum, high interference immunity communication via the LoRa protocol (TelemetrySystem)
Adafruit SPI SMT SD card added to provide redundant data logging capability that is resistant to high vibration.
4x WS2812B "NeoPixels" for displaying status information
Loud buzzer
External device connectors (SPI & I2C QWIIC / STEMMA QT)
XT30 connector for 2s-4s LiPo battery
4x parachute deployment channels with arming screw switch

Pictures of completed hardware

Front side

Rear side

MRAS Ground Station v1

SMA and uFL connectors for different antennas
RF Solutions LAMBDA62 Module for telemetry
Adafruit adalogger Feather M0 for data logging
2x WS2812B "NeoPixels" for displaying status information
ArduinoBuzzer
XT30 connector for 2s-4s LiPo battery
I2C QWIIC / STEMMA QT connectors for expansion
Expansion port for upper "display board" (yet to be developed)

Pictures of completed hardware

MRAS-Karman v1

currently in development