Aero Week 9 ROBBIE MCNALLY SAE Competition Rule

Aero Week 9 ROBBIE MCNALLY

SAE Competition Rule Changes

Battery Capacity Calculations • In the plane: • 1 Xbee Transmitter • 1 Arduino Uno R 3 • 1 MPL 3115 A 2 Altitude Sensor • 1 TS 352 Video Transmitter • 1 Spektrum AR 610 Receiver • 6 Tower Pro Standard Servos Running Time in Optimal Conditions 2200 m. Ah Li. Po Peak Servo = 0. 61 hours = 36. 70 minutes 2200 m. Ah Lipo Servo @ Rest = 2. 27 hours = 136. 22 minutes 1000 m. Ah Li. Po Peak Servo = 0. 28 hours = 16. 68 minutes 1000 m. Ah Li. Po Servo@ Rest = 1. 03 hours = 61. 92 minutes 1300 m. Ah Li. Po Peak Servo = 0. 36 hours = 21. 68 minutes 1300 m. Ah Li. Po Servo @ Rest = 1. 34 hours = 80. 50 minutes

Battery Capacity vs. Weight Battery Weights (3 S Li. Po, EC 3 Connector) Capacity m. Ah Weight (g) Weight (oz) GForce 30 C L 1000 m. Ah 1000 89 3. 14 GForce 30 C 1300 m. Ah 1300 123 4. 34 Gforce 30 C 2200 m. Ah 2200 186 6. 59 Li. Po Battery Weight vs Capacity (3 S, 30 C EC 3 Connector) 200 180 160 Weight (g) 140 120 100 80 60 40 20 0 0 500 1000 1500 Capacity (m. Ah) 2000 2500

Battery Recommendations In the plane: 3 S 30 C 2200 m. Ah Li. Po Can power Servos, DAS, and FPV system Might On need voltage regulator for servos the ground: 3 S 30 C 1000 m. Ah Li. Po Can power FPV receiver Could use USB boost converter but battery is safer and more reliable

FPV Camera Fo. V Testing Horizontal Fo. V @ 110 ft is 115 ft

Ordered New Parts More powerful Xbees 50 m. W output to 250 m. W output Blue. Beam 900 MHz antenna set 5. 8 GHz Cloverleaf Antennas 90 degree header pins Allow secure connections of sensors to Arduino Antenna Type/Angle Adapters RP-SMA Right Angle Adapters

Triggering the Drop Mechanism 2 nd Spektrum DX 6 i with separate receiver in plane Drop mechanism will be triggered by 2 nd controller on free channel IR sensor on bottom of fuselage Sensor will send notification to ground station when packages are dropped Advantages: Reliable 2. 4 GHz communication system Don’t have to manually program a packet to send in XCTU IR sensors are very simple and reliable Doesn’t require copying packets to all possible ground station laptops

DAS Enclosure Lx. Wx. H = 3. 74” x 2. 88” x 1. 90” Outermost layer will be plastic Possibly 3 D printed Interior of plastic will be covered in ~4 mm of rubber Arduino will sit inside 2 pieces of foam Right angle headers allow for foam to hold wires together instead of pushing them apart Drilling/cutting foam by hand to ensure tight fit Holes for: Altitude sensor airflow 900 MHz Antenna IR sensor ribbon cable Arduino power cable External Reset Switch wires Questions: Latch/closing system for the box? 3 D printed or external? Drilling holes in 3 D printed box for antennas, sensors, and airflow? Enclosure for FPV system?

External Reset Switch Momentary pushbutton switch to reset Data Acquisition System Needs to be at least 12” away from prop – SAE Rules

Next Week Test Range of new 900 MHz antennas Receive new Xbees Configure the new modules Run sample code Test with old antennas Test with new antennas Write code for To. F sensor to detect bomb drop Configure airspeed sensor to work with microcontroller Start testing multiple devices on I 2 C bus at the same time Order batteries for plane and ground station Buy and start shaping foam mold for DAS Enclosure Meet with Professor Hedrick to do antenna testing