Aero Week 9 ROBBIE MCNALLY

SAE Competition Rule Changes

Battery Capacity Calculations Running Time in Optimal Conditions 2200mAh LiPo Peak Servo =0.61hours =36.70minutes 2200mAh Lipo Rest =2.27hours =136.22minutes 1000mAh LiPo Peak Servo =0.28hours =16.68minutes 1000mAh LiPo Rest =1.03hours =61.92minutes 1300 mAh LiPo Peak Servo =0.36hours =21.68minutes 1300 mAh LiPo Rest =1.34hours =80.50minutes In the plane: 1 Xbee Transmitter 1 Arduino Uno R3 1 MPL3115A2 Altitude Sensor 1 TS352 Video Transmitter 1 Spektrum AR610 Receiver 6 Tower Pro Standard Servos

Battery Capacity vs. Weight Battery Weights (3S LiPo, EC3 Connector)Capacity mAhWeight (g)Weight (oz) GForce 30C L1000 mAh GForce 30C 1300 mAh Gforce 30C 2200 mAh

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

FPV Camera FoV Testing Horizontal 110ft is 115ft

Ordered New Parts  More powerful Xbees  50mW output to 250mW output  BlueBeam 900MHz antenna set  5.8GHz Cloverleaf Antennas  90 degree header pins  Allow secure connections of sensors to Arduino  Antenna Type/Angle Adapters  RP-SMA  SMA  Right Angle Adapters

Triggering the Drop Mechanism  2 nd Spektrum DX6i 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 2.4GHz 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  LxWxH = 3.74” x 2.88” x 1.90”  Outermost layer will be plastic  Possibly 3D printed  Interior of plastic will be covered in ~4mm 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  900MHz Antenna  IR sensor ribbon cable  Arduino power cable  External Reset Switch wires  Questions:  Latch/closing system for the box? 3D printed or external?  Drilling holes in 3D 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 900MHz antennas  Receive new Xbees  Configure the new modules  Run sample code  Test with old antennas  Test with new antennas  Write code for ToF sensor to detect bomb drop  Configure airspeed sensor to work with microcontroller  Start testing multiple devices on I2C 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