Inertial Measurement Unit for Garvey P12 A Mission

Inertial Measurement Unit for Garvey P-12 A Mission

Contents o o o Integration System Objectives Requirements Design Constraints Design Risks and Mitigation 9/17/2020 Garvey Spacecraft P 12 A: Inertial Measurement Unit 2/14

Integration o o The IMU board will be small enough to fit on any level of payload shelving Approximate dimensions for the IMU board will be 3. 5”x 4. 0”x 2. 0” 9/17/2020 Payload Mounting Shelves Garvey Spacecraft P 12 A: Inertial Measurement Unit 3/14

System Objectives o o o Study X, Y, and Z-axis acceleration of the Garvey P-12 A flight Study Roll, Pitch, and Yaw of the Garvey P-12 A flight Compare our IMU data with CSULB IMU data Construct the flight path for the Garvey P-12 A Rocket Testing Software libraries and hardware for future Kentucky Space Missions Practice design, development and testing processes 9/17/2020 Garvey Spacecraft P 12 A: Inertial Measurement Unit 4/14

Design Overview o o o o Command Data Handling Accelerometer Subsystem Gyro Subsystem EPS Hardware Design Data Flowchart Materials and Supplies 9/17/2020 Garvey Spacecraft P 12 A: Inertial Measurement Unit 5/14

C&DH o o MSP 430 Data logging Circuit n Low power 16 -bit microcontroller n 8 channel 12 -bit Analog to Digital converter n 2 Digital Communication ports (UART, SPI, I 2 C) Software n Drivers for ADC channels n Driver for SD file system n Driver for Timer n Driver for SPI data channel 9/17/2020 Garvey Spacecraft P 12 A: Inertial Measurement Unit 6/14

Accelerometer Subsystem o o o 3 -axis +/- 6 g accelerometer (MMA 7260 Q) Regulated 3. 3 V supply Using 0 to 3. 3 V analog to digital converter n n n 9/17/2020 -6. 0 g to 6. 0 g effective range 200 m. V/g sensor output 12 bit analog to digital converter: Sampling resolution: 0. 0606 g Garvey Spacecraft P 12 A: Inertial Measurement Unit 7/14

Gyro Subsystem o o o Single axis gyro (MLX 90609) Regulated 5 Volt supply Using 0 to 2. 5 V analog to digital converter: n n n 9/17/2020 300 o/s resolution 0. 5 V < output < 4. 5 V voltage split into ADC 12 bit Analog to Digital Converter: Sampling resolution: 0. 1465 o/s Garvey Spacecraft P 12 A: Inertial Measurement Unit 8/14

EPS o o o 5 Volt (LM 340 T) voltage regulator to supply Gyros and 3. 3 V regulator. 3. 3 Volt (LM 2937 ET) voltage regulator for 3 -Axis Accelerometer, MPS 430, SD Card. 2 Energizer 9 V batteries. 9/17/2020 Garvey Spacecraft P 12 A: Inertial Measurement Unit 9/14

Hardware Design 9/17/2020 Garvey Spacecraft P 12 A: Inertial Measurement Unit 10/14

Data Flowchart 9/17/2020 Garvey Spacecraft P 12 A: Inertial Measurement Unit 11/14

Data Acquisition o o The MSP 430’s sample and hold hardware will be used to reduce noise on the analog input channels The MSP 430 will write raw data to the SD card at 2 -3 MHz (for 6 A 2 D channels). 9/17/2020 Garvey Spacecraft P 12 A: Inertial Measurement Unit 12/14

Materials and Supplies Description Part number MSP 430 boards DEV-00047 1 $34 Sparkfun SD card breakout boards BOB-00204 1 $18 Sparkfun Three-Axis Accelerometer MMA 7260 Q 1 $20 Sparkfun Gyro MLX 90609 3 $60 Sparkfun 7 Mhx oscillators 5 V Regulators 3. 3 V Regulators PC board X 188 -ND LM 340 T-5. 0 -ND LM 2937 ET-3. 3 -ND V 2011 -ND 1 1 $4. 20 $1. 74 $2. 05 $20 SD Card sdsdb-2048 1 $6. 40 Amazon Total 9/17/2020 Quantity Price Supplier Digikey $286. 39 Garvey Spacecraft P 12 A: Inertial Measurement Unit 13/14

Risks o o o Logistics of mounting gyros on perfectly orthogonal axes Logistics of mounting accelerometer so that zaxis points accurately Short turn-around and limited testing time. Recovery of SD card for data analysis RBF and triggering logging 9/17/2020 Garvey Spacecraft P 12 A: Inertial Measurement Unit 14/14