Introduction

Link to Rev 1: https://uwarg-docs.atlassian.net/wiki/spaces/EL/pages/2765914176/Water+System+Controller

• Who

  • Daniel Puratich architecture, component selection, pm

  • Shawn Yang schem n layout I think but hasn't started yet

  What

  interface between Pixhawk GPIO ports and 12v rail to pump, float, and release solenoid

• https://www.digikey.ca/en/products/detail/texas-instruments/TPS4H160AQPWPRQ1/6175214

• What will not be included,

  • why am i mentioning things that won’t be features?

    • need to keep it simple and safe to get a functional first rev out fast

    • maybe this and other things could be implemented in the future long term in a future project but we just aren’t here yet as a team

  • no buck

    • external buck for 48V to 12V required for the first rev, one will be selected and linked below, plenty of options exist for this

  • no CAN circuit

    • firmware is struggling with https://uwarg-docs.atlassian.net/wiki/spaces/ARCHS22/pages/2555904119/CAN+Integration+2025?search_id=99d9c02e-7941-4ee2-82d0-2c122bfa0b60&additional_analytics=queryHash---7f978b8f92e6fafe064d9236a790a0a47e8e5cec2916cdb791a52078bd173393

• 3D Model

  • View file
    name PCB.step

• Where

...

• What
  the board takes the input signal from Pichawk, feeding into a four-channel high-side switch to trigger the solenoid for the water system.

LDO selection: LP2985-50DBVR Texas Instruments | Integrated Circuits (ICs) | DigiKey

• Well documented

• 16v(max) to 5v fixed

Ina180 datasheet: https://www.ti.com/lit/ds/symlink/ina180.pdf

Rsense: PE1206FKF470R01Z

RES 0.01 OHM 1% 1W 1206

Rsense Calculation

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