Worknight 2.25.2020

InvenTeam Worknight

Date: 2.25.20

Location: Logan High School

Time: 4:30-6:30

Goals: Continue testing the sensors, determine baselines for the software, and begin working on ideas for protecting the sensors and electronics 

Students: Tommy, Abie, Clara, Sam, Rebecca, Will, Ella

Today we continued our work on the sensor circuit boards and tested the second board for functionality. We attached the two sensors to the top and bottom of the Camelbak and took pressure readings with different amounts of water, in different positions, and with different amounts of pressure on the bladder. We also discussed ideas for securing and protecting the sensors and electronics. We thought about questions like how will the sensor be mounted on the Camelbak? Where will it be mounted?

We determined the baseline readings needed for the software. Our first priority readings were: empty bladder (0% full), half full (50% full), full (100% full). Our second priority readings were bladder compressions, which we can get from repeating tests we have done previously. Another question that came up was how will this monitoring system be powered?

We discussed multiple possibilities like batteries and batteries that can be solar powered.

Because our team shirts came in last week, we ended the work night with a team photo!

Notes from Abie and Rebecca: Circuit Board and Plumbing Packaging 

Problem: We need to design an enclosure that protects two circuit boards and a battery pack. 

• Enclosure 

• Snap-together plastic enclosure/box sealed with o-rings
• Use inventor to design box, purchase o-rings and other parts 

• 2 Different boxes vs one big box 

• House both boards in one box, use tubing to connect top and bottom to meet with one big box 
• Tubing 
• Where would we put the sensor connections for the tubes?

• Having the tube on the twist opening would make things difficult when opening the bladder
• Run two tubes through one fitting, allowing for one central location for the box
• Where would we disconnect the tube to attach to the box?
• Use one connection with one long piece of tubing permanently connected to the box
• Use two connections, a tube to connect to the bag and a tube to connect to the input on the box

• Location of box(s)

• Run tubes into a more accessible location in backpack

• Makes the battery pack accessible and isolated from water

• Where do we attach the box?

• Cut out a section of the backpack to place it
• Make the enclosure have the ability to be removed from the backpack/bladder
• Use velcro to remove
• Use some sort of clip
• How do you make the box compatible for different backpacks or bladders?
• Make the design limited to only one backpage and bladder size
• Concept A
• Mount the box permanently in the backpack, in the same compartment as the bladder
• Pros: The tubes are in the same same compartment as the bladder
• Cons: The circuit could get wet because it is close to the bladder 
• Concept B
• Mount the box in an isolated compartment as the bladder
• Pros: It would prevent the circuit from getting wet
• Cons: You would need to cut through the backpack to connect the sensor tubing to the box

Dimensions of circuit board

Length - 8.5cm

Width - 3.2

Height - 2.2

9 Volt Battery

Tube size 3mm or ⅛ In

Sam and Will working on programming parameters.

Tommy and Clara and Mr. Foye bench testing the two sensors before doing a water volume test.

Rebecca and Abie working with Mr. Butterworth on a housing for the electronics.

Our first water volume test with both sensors implemented.

In one part of the test we used a book as a weight to see if compression effected the pressure readings.

The 2019-20 Logan InvenTeam