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Capsule, Rocket image (Redundant Line Pin 3 (Step Down 28v to 12v (Relay 2…
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Rocket 
Redundant Line Pin 2
Step Down 28v to 5v
Arduino Mega 2560
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Relay 3
Atmega 328p
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Error Check 2: A accurate altimeter sensor will be used as a fail safe to eject off the rocket. If the altimeter sensor is reading an appropriate height but the timed event lines have not powered on, then our payload deck’s Arduino Mega will send a signal to the capsule’s microcontroller. The signal will determine an error message that will be sent to us via Iridium. The message will say that our payload deck’s Arduino Mega could not read in timed event line. Our program will end and stop all operations. We need the timed event lines to continue because one of the timed event lines is connected to our launching mechanisms.
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Error Check 4: Capsule’s microcontroller did not read in a signal from the Arduino Mega. A timer will start once the microcontroller is powered on. If the microcontroller does not receive any signal from the Arduino Mega by a certain time then send an error message and cut all operations.
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- GSE line will power our Arduino Mega that is located on the outer edge of the payload deck, the capsule, and all the internal capsule components. Wallops will not need to reset our system after every power cycling test. Wallops will also be checking our Transceiver frequency and so our rockblock 9603 component will be on once power is supplied through the GSE line.
- Our launch system will start once the time event signals high. Our payload deck’s Arduino Mega will be listening in on that line. To prevent false positives and accidentally signaling the capsule's micro-controller to activate the inhibited batteries, we will be comparing the altitude with a sensor on the payload Deck (Error Check 2) connected to the Arduino Mega.
- The MS5803-14BA altimeter sensor and GPS system will confirm that we are at an appropriate height and ready to launch once the signaling from the rocket interacts with our payload micro-controller.
- We are now ready to launch off the sounding rocket! This process starts by activating the 2 channel relay. This switch will allow current to flow through our lock mechanism and motor attached to a ball screw linear rod (Error Check 3). Our micro-controller will also signal (via pin from low to high and only for a few seconds. Therefore the line does not need to go through a relay) our capsule's micro-controller (Error Check 4).
- The rod will travel a certain distance in order to reach and press against a pressure button. This will ensure a safety net for the rod not to damage the interior of the rocket. In case our pressure button fails, the tdwell timer will stop supplying power to our motor thus stopping the rod altogether.
- Our capsule will be powered on via a GSE line in series with the payload's microcontroller. For testing purposes, our capsule’s transceiver will be communicating through the Iridium system prior to launch.
- The capsule’s atmega328p microcontroller has read a high signal from the payload's Arduino Mega. This will cause the activation of Relay 4 to start supplying power to our capsule. The signal will also cut power from Relay 3 to prevent any induced current during the action of the wire being pulled out from the capsule by the payload deck’s rod motion. (Error Check 1)
- An onboard timer will start once we have received a signal from the payload's micro-controller. The time interval that will take the rod to push the capsule off Wallops' rocket + leeway time, will determine our timer's set time to release the capsule's blades. Altimeter Sparkfun Pressure Sensor Breakout MS5803-14BA altimeter sensor on board the capsule will be our redundant blade activating system. If the timer has started and we have not launched yet then deploy the blades. If we have deployed the blades already, do nothing. (Error Check 2)
- Yost Labs 3 Space Sensor and Adafruit BME280 will be reading in data, parsing data, and finally sending all data through the iridium transceiver throughout our mission. This data will be later evaluated and feed into a simulator.
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The Adafruit Ultimate GPS Breakout- 66 channel w/10 Hz updates- Version 3 will be used to error check during each event.