Gary MKIII University of Central Florida Chris Valle, Braden Urban, John Rowe, and Tyler Yoemans

Mission Collect and transmit temperature, pressure, and altitude data, as well as take a picture at 80,000 feet. – Use temperature data to activate and turn off heaters, ensuring the interior of the box is kept above 10 degrees Celsius. – Use pressure data to estimate altitude using function stored in computer, and activate camera at desired altitude. – Use the power distribution board in conjunction with the computer to activate and turn off components. – Transmit data to ground with radio, as well as store it on onboard SD Card.

SHOT II / UN-4 Connection: The purpose of the payload it to test Power and C&DH flight hardware, as well as provide the team an opportunity to practice programming.

Communications Two Kenwood TH-D7A radios Proof of concept. We are able to transmit data from the computer on a relatively low frequency band. Box antenna consists of just the radio. Ground station consists of radio connected to a Yagi antenna. Weather Balloon BoxGround Station Powered by the on-board power system. Powered by stock battery pack. Transmit OnlyReceive Only Communicates using our Atmel powered board. Communicates using a laptop running Hyper Terminal.

Power Distribution Power provided by six 9-Volt batteries in parallel. Regulated by two AP34063 Universal DC to DC converters – One chip to reduce 5 volts for computer – The other to boost to 13.8 for the radio Power control based off of MOSFETs, switched on and off by computer.

C&DH EVK1100 development kit – This kit comes equipped with the 32-bit ATMEL processor which Knightsat’s C&DH was designed around Comm. Interfaced via RS-232 USART0 Camera interfaced via RS-232 USART2 Pressure and temperature sensors interfaced through 6 of the 8 ADC channels Using the multiplexer on our GPIO we are able to use unmapped pins to provide a 3.3V signal to trigger the MOSFETs

Test Program and Compliance Individual testing of each component Integration of two, three, then all systems Payload complies with all User’s guide requirements for: – Center of mass – Total mass – Communication bandwidth restrictions – Integration with flight string

Expected Results Temperature, Pressure, and Altitude data will be transmitted to ground All data and photograph will be stored to onboard memory – Data is expected to show that correct temperatures were maintained, image was taken at the correct altitude, and that all systems were activated at the correct times.

Demonstration Send Data over the radios Demonstrate power control