Importing Components for Project

flux

0:00

Work done
  • Updated project description with E-stop goals and hashtags (#E_STOP #MOSFET #PH2.0 #SAFETY)
  • Defined system architecture and saved the following Mermaid diagram in the “System Architecture” property:
Diagram



  
    
  
  
    
  



Power









10kΩ Pull-up\n3.3V Rail










"ESP32\n(IO12)"
"PH2.0 Conn1\nE_STOP_IN1"
"PH2.0 Conn2\nE_STOP_IN2"
"MOSFET Gate\n(E_STOP_DRIVE)"
"3.3V Rail"
"36V Bus"
"Contactor Coil"
"MOSFET Drain\n(E_STOP_PATH)"
"MOSFET Source"
"System Ground"
Tasks not yet done
  • Place two series-connected PH2.0 connectors (E_STOP_IN1, E_STOP_IN2)
  • Select and place a logic-level N-channel MOSFET (≥50 V, 60 A)
  • Add 10 kΩ pull-up and gate-to-source resistors
  • Wire ESP32 IO12 through connectors to MOSFET gate and add resistors
  • Insert MOSFET into ground return path and sever the direct ground link
  • Rename nets to E_STOP_CONN1, E_STOP_CONN2, E_STOP_DRIVE, E_STOP_PATH
  • Run ERC to verify there are no floating pins or violations
Success criteria
  • E-stop circuit not yet integrated; criteria are not met.
Next step Move on to the “Key components” phase: pick and add the two PH2.0 connectors and the 50 V/60 A MOSFET to the schematic.
97 days
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    PCB E-dolly

    PCB E-dolly thumbnail
    36 V Contactor Coil Driver with Safe Kill Loop, 3.3 V Logic, SPI IMU, 24 V/5 A Buck, and ESP32 IO12-Driven E-Stop MOSFET via Series PH2.0 Safety Connectors #E_STOP #MOSFET #PH2.0 #SAFETY

    Properties

    36 V contactor coil driver with safe kill input loop interface and 3.3 V logic control.

    Base-emitter pull-down for Q1 ensuring coil off when IC1 output is high-Z or low.

    Low-side NPN transistor (Q1 MMBT5551) with flyback diode (D2 UF4007) across coil between Net 1 (36 V) and Net 14 (Q1 collector).

    Base/gate series resistor limiting drive from IC1 to Q1 (switching control).

    R3 (10k), C4 (100nF) to GND provide RC filtering; R4 (1k) provides series input protection and loop termination from CN3.

    2-pin connector for external safe kill loop input (Safe Raw on pin 1, GND on pin 2).

    Diagram
    


  
    
  
  
    
  



Power









10kΩ Pull-up\n3.3V Rail










"ESP32\n(IO12)"
"PH2.0 Conn1\nE_STOP_IN1"
"PH2.0 Conn2\nE_STOP_IN2"
"MOSFET Gate\n(E_STOP_DRIVE)"
"3.3V Rail"
"36V Bus"
"Contactor Coil"
"MOSFET Drain\n(E_STOP_PATH)"
"MOSFET Source"
"System Ground"

    Net 11

    Automotive

    Transistor

    Steps 36 V down to 3.3 V (Net 7) for logic and control electronics.

    Standard flyback / freewheeling diode D2 from 36 V supply to transistor collector (Net 14) to clamp inductive kick on turn-off.

    Battery

    Schmitt Trigger Inverter

    High-side 36 V supply for contactor coil and buck converter input.

    36

    V

    3.3 V logic rail powering ESP32 and SN74LVC1G14 Schmitt inverter.

    Integrated Circuit

    Diode

    Safe kill input loop sensed via R3/R4 and filtered by C4 into Schmitt-trigger IC1.

    Pricing & Availability

    Distributor

    Qty 1

    Arrow

    $12.87–$17.73

    Digi-Key

    $14.27–$24.75

    LCSC

    $17.28–$18.38

    Mouser

    $30.04

    TME

    $15.40

    Verical

    $14.03–$35.93

    Controls