Sensor Head Mount CDR

Owned by Egor Gorelyy
Last updated: Dec 02, 2022
4 min read

Project Scope Review

The sensor head mount is used to collect soil data as part of the science mechanism to analyze it and determine whether the soil should be studied further by being collected. Incorrect readings on temperature, carbon dioxide, or moisture sensors can threaten the success of the science mission. The sensor head mount allows the sensors to interface with the soil with the right conditions.

Success Factors Review

Relevant Competition Rules

  • Teams are given between 20 and 35 minutes to collect data with the rover

  • At each site the team needs to determine the absense or presense of life

Criteria

Constraints

Criteria

Constraints

Allow the moisture sensor to collect data from the soil

Sensor head must not interfere with P0233 or any other components like the dinolite camera

Allow the C02 sensor to collect data from soil

Allow the dinolite microscope camera to be rotated and refocused

Allow the temperature and humidity sensor to collect data from the soil

CO2, moisture, and temperature and humidity sensors need to be positioned lower than the bottom of the orange and cyan 3d printed parts (the black line showing the edge of the soil) (See picture)

If the sensors are positioned above that point then when being lowered into the soil, the blue and cyan parts will interfere with it.

 

Sensor head should aim to minimize weight

The sensor head has a limited number of poitns at which it can attach and as such it can only be so large before it fails.

Design Concept Review

 

  • Criteria

    • The CO2, moisture, and temperature sensors are able to interface with the soil correctly. The CO2 and temperature sensors are mounted within enclosures which ensures better sealing of the environment. Once the part is 3D printed further adjustments might be made for better sealing of these sections. The design allows the insertion of the moisture sensor to appropriate depth

    • The sensor head is relatively small which helps to minimise the weight

  • Constraints

    • Sensor head does not interfere with any of the other components; it is sufficiently small such that it does not interfere with the dinolite camera and allows it to freely move

    • All three sensors interface with the soil at a lower point than the bottom section of P0234

    • The sensorhead is attached at two points with several screws. Its weight is safely distributed among these two points.

DFMA Review

  • The sensor head will be 3D printed (if printing it in one piece is not viable it can be redesigned to be in two parts and then joined with fasteners once both parts are printed)

  • The M3 x 0.5 14mm screws will be sourced from McMaster-Carr

Budgeting Information

  • The cost of printing filament

  • The cost of the fasteners (M3 x 0.5 20mm) is $0.04 at EMS

Timeline

  • Plan to 3D print the design this weekend and if everything fits it will be completed once the fasteners arrive. If any revisions are made the part will be reprinted on Thursday or later.

  • Planning to finish before the 19th of December