yashthapar / Fuel Sentinel V1 - Automotive Telematics & Fuel Security

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Automotive Telematics Design

flux

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Work done
  • Added automotive input + protection: J1, D1 (1N4007 series), D3 (TVS)
  • Wired buck + 5V rail + bulk cap: PS1 -> ^+5V with C1 470uF
  • Implemented and wired sensing:
    • Fuel follower: U4 -> U1 GPIO34 (D34)
    • Fuel pull-up + isolation: R1 10k + D6 (Schottky) to fuel input J3
    • Ignition divider to GPIO35: J2 + R3 10k / R4 4.7k
    • Tamper header + pull-up to GPIO13: J4 + R5 10k
  • Verified UART mappings:
    • SIM800L U3: TXD->ESP32 RX2(GPIO16), RXD->ESP32 TX2(GPIO17)
    • NEO-6M U2: TX->GPIO21, RX->GPIO22
  • Set layout baseline: 2-layer 1.6mm FR4 stackup + default 10 mil trace width
Success criteria review
  • ✅ ESP32 DevKit-V1 + power regulation + sensing circuits implemented and wired per values/mapping
  • ✅ ERC “Missing Power” cleared (added PowerNet1 to satisfy symbol check)
  • ❌ PCB constraints not fully enforceable yet: Flux DRC still reports Airwires (37) because routing (and copper pours/keepouts/via stitching) cannot be executed by me in this environment
Next steps
  • In PCB editor, run Auto-Layout / route the 37 airwires, then I can re-check DRC.
  • If you share the antenna keepout dimensions/regions (or a board outline file), I can help define exact keepout polygons and confirm the rules once those layout primitives exist.
54 days
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    Fuel Sentinel V1 - Automotive Telematics & Fuel Security

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    Fuel Sentinel V1 - Automotive Telematics & Fuel Security

    Properties

    Diagram
    


  
    
  
  
    
  























UART

UART













"Car battery node_12V input"
"Reverse diode + TVS"
"LM2596 buck node_5V node_3A"
"5V rail"
"ESP32 DevKit V1"
"SIM800L"
"NEO-6M"
"Ignition sense divider"
"Fuel sender line"
"LM358 follower (IGN on)"
"3.3V pullup via Schottky (IGN off)"
"Tamper switch header"
"Common GND"

    Pricing & Availability

    Distributor

    Qty 1

    Arrow

    $1.43–$2.79

    Digi-Key

    $5.83–$7.02

    LCSC

    $11.42–$11.53

    Mouser

    $4.29

    TME

    $3.55

    Verical

    $1.23–$3.20

    Controls

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