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Projects 2019-2020 – CADSat
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Projects 2019-2020

 

 Project Gallery 2019-2020

Team: GKF5

Project: Tephigram

Greece 14 years old, 13 years old Tinkercad

The scientific and technical objectives of CADSat mission

The objectives of the project are:
– to get acquainted with STEM and Artificial Space Satellite technology
– to achieve learning based on inquiry
– to understand concepts in math and physics,
– to appreciate the importance of “trial and error” method in scientific process
– to design our very own mini-3D-satellite the size of a soda can
– to work together against all odds sharing a common vision and conceiving an innovative design
Based on the theoretical model we have conceived, our satellite will be launched with the aid of a rocket at an altitude of one (1) km, it will then be separated from the rocket and during its descent, which will be realised with the aid of a recovery system – a parachute – at a descent velocity of 8 to 11m/sec, it will accomplish the Secondary Mission we have selected.

Primary Mission
According to the Primary Mission the satellite during its descent will measure the following parameters and transmit the data as telemetry to the ground station:
• temperature
• atmospheric pressure
• humidity

Secondary Mission
During its descent CADSat will be retrieving measurements (per sec) of:
➤ temperature (BME280)
➤ humidity (BME280)
➤ atmospheric pressure (BME280)
➤ latitude and longitude (GPS)
➤ altitude (GPS)
➤ air direction and air speed (GPS)
➤ CO (MQ-9).
All data will be sent to the Ground Station as telemetry. After CADSat has landed all data will be processed using Python 3 in conjunction with matplotlib and tephigram libraries so as to produce the tephigram of the area and consequently the area’s weather forecast. At the same time levels of carbon monoxide (CO) in the atmosphere will be measured. Eventually, using Python 3 or LibreOffice Calc, graphs such as:
– atmospheric pressure – height
– temperature – height
– humidity – height
– CO – height.
will be produced based on received data.

Electronic Systems
For CADSat we will be using:
– Temperature, Humidity, Atmospheric Pressure Sensor: BME280
– CO Sensor: MQ-9
– GPS: NEO-6MV2
– Wireless Communication: SX1278 LoRa Module 433M – Ra-02 + Antenna
– Microcontroller: ESP32 (36 PINS VERSION)
– Two 9V batteries in parallel connection for ESP32 input
– An ON/OFF switch

For the Ground Station we will be using:
– Wireless Communication: SX1278 LoRa Module 433M – Ra-02 + Antenna
– Microcontroller: ESP32 (36 PINS VERSION)

Telemetry
Two (2) SX1278 LoRa Module 433M – Ra-02 + Antenna will be used, one for CADSat and one for the ground station. Frequency 433ΜHz which is free will be used and wireless communication between CADSat and the ground station will be coded. The ground station will be connected to a computer and PuTTY software will be used to record all data in file form.

Software/Programming Options:
Arduino IDE, Python 3 and LibreOffice Calc.

Positioning Retrieval System
To the purpose of the CADSat retrieval after landing the following will be used:
– 8 brightly-coloured or RGB LEDs mounted to the perimeter of the cylinder (it will be ensured that they do not poke out) which will be flashing as soon as it lands
– 2 buzzers producing a high-pitched sound at the time of landing
– a mobile phone or tablet device equipped with a GPS application in order to trace the landing point of CADSat. Latitude and Longitude will be provided by CADSat GPS in conjunction with the Ground Station.

Recovery System: Parachute
Based on the sources we have consulted a calculation mode for the surface area of the parachute is available in CanSat resource material.
The calculation mode is based on the following parameters:
– mass of the CanSat (typically 0.35 Kg)
– acceleration due to gravity = 9.81 m/s2
– density of the air (assumed to be constant at 1.225 kg/m3 ),
– drag coefficient (depending on the shape of the surface area of the parachute – eg. cross, hemisphere etc),
– descent velocity of the CanSat in m/s (The range of allowed velocity is 8-11 m/s)
Given the fact that CADSat is a digital blueprint, it is not feasible to estimate the surface area of the parachute, since its real weight is not known.
In any case we propose is a cross-shaped parachute with a choice of RAL 1026 or RAL 4003 or RAL 3026 colours, which will depend on the ground topographical parameters of CADSat landing site.

The above description with pictures/tables/links you can find in 3D project link (https://drive.google.com/drive/folders/10QG2QCVPrRkOQ0OIBu3D_0HXCKsm7Coj?usp=sharing) at file: CadSat_GKF5_Report.pdf

CADSat design – the modules that placed inside and their functions

Designing
After our team as a whole has consulted the CanSat competition requirements as well as the CADSat specifications, we set the layout of CADSat design via online meetings. We used a cylinder in the inner part of which there is a component used to support the Sensor Support Plate.
The cylinder has four (4) 5mm χ 2mm χ 75mm grooves and two holes for the screws aimed to support the lid of the cylinder. There is also an extra component in the shape of a hemisphere which will prevent potential damage of the cylinder during descent. The 6,8 cm x 1 cm x 4,6 cm Sensor Support Plate is used to support the microcontroller and the sensors. On the upper external part of the cylinder lid a loop is attached, in order to fasten the recovery system used, which in our case is a parachute and there are holes for the usb cable to allow for effective computer connection.

Electronic Systems
For CADSat we will be using:
– Temperature, Humidity, Atmospheric Pressure Sensor: BME280
– CO Sensor: MQ-9
– GPS: NEO-6MV2
– Wireless Communication: SX1278 LoRa Module 433M – Ra-02 + Antenna
– Microcontroller: ESP32 (36 PINS VERSION)
– Two 9V batteries in parallel connection for ESP32 input
– An ON/OFF switch

For the Ground Station we will be using:
– Wireless Communication: SX1278 LoRa Module 433M – Ra-02 + Antenna
– Microcontroller: ESP32 (36 PINS VERSION)

Telemetry
Two (2) SX1278 LoRa Module 433M – Ra-02 + Antenna will be used, one for CADSat and one for the ground station. Frequency 433ΜHz which is free will be used and wireless communication between CADSat and the ground station will be coded. The ground station will be connected to a computer and PuTTY software will be used to record all data in file form.

Software/Programming Options:
Arduino IDE, Python 3 and LibreOffice Calc.

Positioning Retrieval System
To the purpose of the CADSat retrieval after landing the following will be used:
– 8 brightly-coloured or RGB LEDs mounted to the perimeter of the cylinder (it will be ensured that they do not poke out) which will be flashing as soon as it lands
– 2 buzzers producing a high-pitched sound at the time of landing
– a mobile phone or tablet device equipped with a GPS application in order to trace the landing point of CADSat. Latitude and Longitude will be provided by CADSat GPS in conjunction with the Ground Station.

Recovery System: Parachute
Based on the sources we have consulted a calculation mode for the surface area of the parachute is available in CanSat resource material.
The calculation mode is based on the following parameters:
– mass of the CanSat (typically 0.35 Kg)
– acceleration due to gravity = 9.81 m/s2
– density of the air (assumed to be constant at 1.225 kg/m3 ),
– drag coefficient (depending on the shape of the surface area of the parachute – eg. cross, hemisphere etc),
– descent velocity of the CanSat in m/s (The range of allowed velocity is 8-11 m/s)
Given the fact that CADSat is a digital blueprint, it is not feasible to estimate the surface area of the parachute, since its real weight is not known.
In any case we propose is a cross-shaped parachute with a choice of RAL 1026 or RAL 4003 or RAL 3026 colours, which will depend on the ground topographical parameters of CADSat landing site.

The above description with pictures/tables/links you can find in 3D project link (https://drive.google.com/drive/folders/10QG2QCVPrRkOQ0OIBu3D_0HXCKsm7Coj?usp=sharing) at file: CadSat_GKF5_Report.pdf



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