About Me[edit | edit source]

David Hoffman
I am going into my third year at Michigan Technological University as a mechanical engineer with a minor in electrical engineering. I am the Range Safety Officer and a member of the payload team at the Keweenaw Rocket Range. I have a passion for space with a strong interest in autonomous manufacturing (CNC and 3d printing). I own a JGarora A5 3d printer, and am currently rebuilding the x-carriage and replacing the control board.

Open Source Hardware Enterprise[edit | edit source]

Semester 1 Fall 2020[edit | edit source]

Print Farm Automation: This semester I worked on finding solutions to neaten up the wiring for the scraper, and ordered parts to make a wire harness. I also wrote a python script that automates the task of editing G-Code to work with the machine. This was accomplished by opening the G-Code file output from CURA, and then copying the code and splicing in removal commands. I also took the existing documentation in the google drive and moved it over to Appropedia and Github to make it more easily accessable.

Interests[edit | edit source]

  • 3d Printing
  • CNC Manufacturing
  • Space Technologies
  • Microcontrollers and Arduino

Experience[edit | edit source]

Battery Performance tester[edit | edit source]

I designed and built a Arduino based circuit to repeatedly charge and discharge a battery while logging cell voltage to an SD card at regular intervals. I then analyzed the collected data with MATLAB to verify the batteries performance against the manufacturers specifications.

Environmental Sensor Package[edit | edit source]

In spring 2019 I worked in a team of students on the Keweenaw Rocket Range to build a rocket payload for the 2019 Spaceport America Cup IREC Competition. At the competition our payload flew successfully and recovered valuable data. However several channels of data were not collected due to a GPS malfunction. In spring 2020 I worked with the same team to specialize the original design to measure the shock wave on the rocket as a function of mach speed. However due to the COVID-19 outbreak, the project has yet to be launched.