Category: Kristina’s Status Reports

UART Pi5 to Pico Communication Code

• Began writing code for UART communication between Pi5 and Pico

Design Report and Research

• Focused on finishing the Design Report and polishing all sections for submission
• Strengthened justifications for system and model design tradeoffs

Schedule & Progress

• On schedule:
  • All off-the-shelf parts have arrived
  • Custom part dimensions verified and adjusted to match real measurements
  • Plan to send out custom cut parts after Fall Break
• Behind schedule:
  • UART Pi5-Pico communication delayed due to debugging
  • Minor delays from Pi5 setup and network configuration issues

Next Steps

• Begin setup and partial assembly of testbed
• Continue debugging UART communication
• Assist with sensor integration and PWM control code

Raspberry Pi Setup

• Set up Raspberry Pi 5 for future UART communication with Pi Pico code development
• Troubleshot several setup issues:
  • Broken mini-HDMI cable causing monitor display issues
  • Missing microSD reader, preventing Pi OS installation through the Pi Imager
  • SSH connection issues due to the wired ethernet network being different from CMU Secure wireless
• Successfully imaged Pi OS onto the microSD card and completed initial configuration at home before bringing the Pi back to campus, which resolved network issues

Parts Procurement

• Ordered off the shelf components listed in the BOM
• Currently waiting for parts to arrive before verifying part dimensions and fabricating laser cut mounting plates

Design Report and Research

• Worked on Design Report sections covering use case and requirement justifications
• Found IEEE Xplore papers related to anomaly detection to reference for style and technical wording in the Design Report

Schedule & Progress

• Currently slightly behind schedule due to:
  • Waiting for hardware parts to arrive before starting laser cut fabrication
  • Delays in Pi 5 setup and network access during initial configuration

Next Steps

• Begin laser cut fabrication once parts (specifically the pump) arrive
• Continue 3D printing remaining brackets and verify fits
• Start Pi 5 to Pico UART code development
• Finish Design Report as soon as possible to get feedback

Completed CAD Model

• Completed CAD model with water loop and other component models downloaded from online (e.g. SSRs, DC-DCs, etc.)
• Adjusted radiator + fan position to reduce board size
• Planned out and added power planes (24V power supply stepped down to 12V, 5V for fan/pump, servo)
• Began 3d printing some parts from CAD design

  

  

  

  

  

  

Block Diagram

• Finalized block diagram to add power supply and conversion
• Adjusted coolant temp sensor connection to separate sensor data collection from controls (fan/pump, valve, heater)
• Added software

  

BOM Draft

• Completed BOM, added case components like linear motion rods and connectors
• Added power components like DC-DC converter, power supply

Schedule & Progress

• Updated schedule to account for part lead times
• Need to order parts ASAP since fabrication for laser cut parts depend on dimensions of actual mounting holes

Next Steps

• Begin ordering off the shelf components from BOM
• Work on design report

Block Diagram Draft

• Made first draft of block diagram showing connections between sensors, Raspberry Pi 5, Pi Pico, SSRs, power resistors, servo valves, and cooling components

BOM Draft

• Made first draft of BOM listing major components based on block diagram and physical assembly, to be updated

CAD Models of Liquid Cooling Components

• Found online CAD models of radiator, fan, and water block
• Altered radiator model to better match actual part
• Created CAD models for pump and reservoir based on product photos and references

Initial CAD Assembly of Cooling Loop

• Built an initial CAD assembly of liquid cooling loop with component models
• Used linear motion rods and connector system for structural frame

Revised CAD Assembly of Cooling Loop

• Updated initial assembly to accommodate sensor placements, including radiator intake/exhaust temperature sensors and mounting space for Raspberry Pi 5 and supporting components

Schedule & Progress

• Currently on schedule
• CAD modeling, assembly, block diagram, and BOM align with Gantt chart

Next Steps

• Iterate on block diagram
• Expand BOM to include linear motion rod and connectors
• Start purchasing off the shelf parts in order to update CAD assembly with corrected dimensions and order 3D print/laser cut parts