Navis (marsian Rover)

You can click on this link to see the demonstration video :

https://www.hermes-space.com/assets/videos/Navis_Insrtuctables_Contest.mp4

Navis (which takes its name from the Latin for "cargo") is a Marsian robotic rover. Its objective is to transport goods (cargo) while remaining horizontally straight regardless of the terrain. Indeed the marsian terrain can be steep and sloping, and some goods must remain perfectly straight, that's why we created a 2D gyroscope on our rover that allows a horizontal balance.

What we have made is only a model of our rover which has for only goal to demonstrate the functioning of the gyroscope, that's why we are not interested in the automation of the rover. However Navis, can move forward and backward as well as turn, that controlled by a remote control.

We know that in a few years the transport of materials on Mars will be important for the installation of a human base, that's why we developed our rover, to ensure the good transport of goods and help the installation of humans.

We are a small team that worked on the project. We are doing other similar space projects.

If you want to know more about us : https://hermes-space.com/

Our Youtube : HERMES Space (https://www.youtube.com/channel/UC9p-PjzbMwZurnbmpeVAVtw)

Our Instragram : @hermes.space

Foam board was used for the structure of the rover, its lightness allows a good sensitivity to the gyroscope, while ensuring a good solidity and an easy handling. Wooden sticks were used to solidify the structure. To glue and fix the parts we used hot glue and mini nails.

For the 2D gyroscope :

• 4 ball bearings (608 - 2RS)
• foam board
• 4 nuts (weights)
• wooden sticks

For the propulsion of the rover (mechanics) :

• 1 DC electric motor (6000 rpm)
• 3 gears (3 sprockets and 3 wheels)
• 1 axle
• 2 wheels (D=88mm)
• foam board
• wooden sticks

For the direction of the rover (mechanics) :

• 1 servo motor (micro)
• 1 steering axle
• 2 wheels (D=88mm)
• foam board
• wooden sticks

For the electronic of the rover :

• 1 motor driver
• 1 arduino nano
• 1 switch
• 1 signal receiver
• 1 battery (9V)

For the electronic of the remote control :

• 1 arduino nano
• 1 switch
• 2 joysticks
• 1 signal transmitter
• 1 battery (3.7V)

The 2D gyroscope works thanks to the 4 ball bearings that allow several successive platforms to tilt in relation to each other so that the central one is always horizontal. 4 nuts were placed under the central platform to balance the forces.

A battery (9V) powers the system, controlled by an arduino where a program for propulsion (DC motor) and steering (micro servo motor) has been installed. The driver motor allows the DC motor to turn in the desired direction. The signal receiver, receives the information transmitted by the remote control (waves in kHz) to the arduino. The system is switched off at the switch.

A battery powers the system(3.7V), also controlled by an arduino where a program for the joysticks has been installed. One joystick controls the propulsion while the other controls the steering. The signal transmitter transmits the information (to the rover's receiver) recovered by the joysticks and processed by the arduino.

The DC motor (6000 rpm) engages three gears (r=0.0107) that turn the wheel axle.

The micro servo motor is connected to the steering shaft.

The connection between the two makes it possible to transform the rotational movement of the servo motor into translational movement for the axle. The wheels are hooked to the structure and when the steering axle moves to the left or right, the wheels turn.