hrithik18k/rc-car-esc-xiao-20261025

index.circuit.tsx

PCB

Schematic

import { Fragment } from "react"
// CarKit-inspired external-ESC receiver carrier. See README.md for limits.
// XIAO socket: official Seeed DIP geometry, rotated USB toward +Y.
const pins = { pin1: "D0", pin2: "D1", pin3: "D2", pin4: "D3", pin5: "D4", pin6: "D5", pin7: "D6", pin8: "D7", pin9: "D8", pin10: "D9", pin11: "D10", pin12: "V3V3", pin13: "GND", pin14: "V5" } as const
const nets: Record<string, string[]> = {
  GND: ["U1.GND", "J1.pin1", "J2.pin1", "C1.pin2", "C2.pin2", "C3.pin2", "R3.pin2", "R4.pin2"],
  BEC5V: ["J1.pin2", "J2.pin2", "D1.anode", "C1.pin1", "C2.pin1"],
  MCU5V: ["D1.cathode", "U1.V5", "C3.pin1"],
  ESC_GPIO: ["U1.D1", "R1.pin1"],
  SERVO_GPIO: ["U1.D2", "R2.pin1"],
  ESC_PWM: ["R1.pin2", "R3.pin1", "J1.pin3"],
  SERVO_PWM: ["R2.pin2", "R4.pin1", "J2.pin3"],
}
export default function RcCarEsc() {
  return <board width="60mm" height="45mm" layers={2} schLayout={{ layoutMode: "none" }} title="RC CAR / ESC + SERVO">
    <schematicsheet name="Main" displayName="RC car ESC carrier">
    <schematicsection name="MCU" displayName="XIAO ESP32-C3 / USB on module" />
    <schematicsection name="Power" displayName="5V BEC / USB backfeed isolation" />
    <schematicsection name="Control" displayName="ESC + steering / 3.3V PWM" />
    <chip name="U1" manufacturerPartNumber="Seeed XIAO ESP32C3" pinLabels={pins} pinAttributes={{ V5: { requiresPower: true }, GND: { requiresGround: true }, V3V3: { providesPower: true }, D1: { isOutput: true }, D2: { isOutput: true } }}
      pcbX={-13} pcbY={7} schX={-8} schY={0} schSectionName="MCU"
      footprint={<footprint>
        {Array.from({length: 14}, (_,i) => {
          const left = i < 7
          return <Fragment key={i}><platedhole shape="circle" holeDiameter={0.889} outerDiameter={1.524}
            pcbX={left ? -7.62 : 7.62} pcbY={left ? 7.62-i*2.54 : -7.62+(i-7)*2.54} portHints={[`pin${i+1}`]} /></Fragment>
        })}
        <courtyardrect pcbX={0} pcbY={0} width={18.3} height={21.5} />
        <silkscreenrect pcbX={0} pcbY={0} width={17.8} height={21} />
      </footprint>} />
    <pinheader name="J1" pinCount={3} pitch="2.54mm" pcbX={22} pcbY={10} pcbRotation={90}
      schX={10} schY={4} schSectionName="Control" pinLabels={["GND","BEC5V","ESC"]} />
    <pinheader name="J2" pinCount={3} pitch="2.54mm" pcbX={22} pcbY={-6} pcbRotation={90}
      schX={10} schY={-4} schSectionName="Control" pinLabels={["GND","BEC5V","SERVO"]} />
    <resistor name="R1" resistance="220" footprint="0805" pcbX={7} pcbY={10} schX={3} schY={4} schSectionName="Control" />
    <resistor name="R2" resistance="220" footprint="0805" pcbX={7} pcbY={-6} schX={3} schY={-4} schSectionName="Control" />
    <resistor name="R3" resistance="100k" footprint="0805" pcbX={15} pcbY={6} pcbRotation={90} schX={6} schY={2} schRotation={90} schSectionName="Control" />
    <resistor name="R4" resistance="100k" footprint="0805" pcbX={15} pcbY={-10} pcbRotation={90} schX={6} schY={-6} schRotation={90} schSectionName="Control" />
    <diode name="D1" footprint="sma" manufacturerPartNumber="SS14" pcbX={0} pcbY={-13} pcbRotation={180}
      schX={-8} schY={-12} schRotation={90} schSectionName="Power" />
    <capacitor name="C1" capacitance="100uF" footprint="electrolytic_d6.3mm_p2.5mm" pcbX={22} pcbY={2}
      schX={-2} schY={-12} schRotation={-90} schSectionName="Power" />
    <capacitor name="C2" capacitance="100nF" footprint="0805" pcbX={11} pcbY={0}
      schX={2} schY={-12} schRotation={-90} schSectionName="Power" />
    <capacitor name="C3" capacitance="10uF" footprint="0805" pcbX={-8} pcbY={-12}
      schX={-12} schY={-12} schRotation={-90} schSectionName="Power" />
    {Object.entries(nets).flatMap(([net,ports]) => ports.map(port =>
      <Fragment key={`${net}-${port}`}><trace from={port} to={`net.${net}`} thickness={0.3} /></Fragment>))}
    {[-25,25].flatMap(x => [-17.5,17.5].map(y => <Fragment key={`${x},${y}`}><hole diameter={3.2} pcbX={x} pcbY={y} /></Fragment>))}
    <silkscreentext text="RC CAR / ESC" pcbX={0} pcbY={20} fontSize={1.3} />
    <silkscreentext text="5V BEC ONLY" pcbX={0} pcbY={-19} fontSize={1.2} />
    <silkscreentext text="S 5V G" pcbX={26} pcbY={10} pcbRotation={90} fontSize={1} />
    <silkscreentext text="S 5V G" pcbX={26} pcbY={-6} pcbRotation={90} fontSize={1} />
    <silkscreentext text="USB" pcbX={-13} pcbY={19} fontSize={1} />
    </schematicsheet>
  </board>
}