MEP EP #126: Space Engineering

Podcast Notes

• Parker
  • MAX6682 breakout board finished and ordered
    • This is for the thermistors
    • GitHub repo for the board files
  • New Jeep, The Grande Wagoneer
    • A/C doesn’t work as expected
    • Found the FSM and Schematic
      • Schematic for the A/C controls
        • Page 31
        • Page 32
    • Schematic has four parts that control the A/C Compressor
      • Evaporator thermistor
        • Turns out this is a standard 5K NTC thermistor
      • A/C temperature sensor
      • Compressor Low Pressure Switch
        • Standard part #4773763
      • Climate Control Box
• Stephen
  • uTracer update
    • Enclosure will be a Hammond Manufacturing 1441-16CWW
    • uTracer PCB will be a daughter board attached to the relay control board
    • Built in USB -> RS-232
• RFO
  • Spider silk microphone also senses slightest waft of air
    • “most waft-able air movement sensor ever”
    • 400V field, ~0.5V/Pa
    • Research paper is behind a pay wall :/
  • Voltage Regulator heatsinks – when are they required?
    • Maximum power dissipation is determined by the maximum junction temperature rating, the ambient temperature, and the junction-to-ambient thermal resistance.
    • PDmax=( TJmax-  TA) / RθJA
    • Junction-to-ambient thermal resistance measured in C/W
    • Maximum Power Enhancement Techniques for SOT-223 Power MOSFETs – AN-1028
    • Constructing Your Power Supply —Layout Considerations – SLUP230
  • Jarrett from slack asks “WTF do you do with 2 million free LEDs?”

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