0hmX/mq135-air-quality-sensor-module

index.circuit.tsx

PCB

Schematic

import mq135ModelUrl from "./models/mq135-sensor.glb"
import rightAngleHeaderModelUrl from "./models/right-angle-pin-header-1x4.glb"
import trimmerModelUrl from "./models/3362p-trimmer.glb"
import soic8ModelUrl from "./models/soic8.glb"
import { Fragment } from "react"

const SENSOR_SECTION = "sensor"
const COMPARATOR_SECTION = "comparator"
const INDICATOR_SECTION = "indicators"
const INTERFACE_SECTION = "interface"

// Winsen Configuration A, bottom view: diagonal sensing electrodes with the
// heater leads centered at left/right. The vertical 90°/270° positions are empty.
const sensorPinAngles = [225, 180, 135, 45, 0, 315]
const sensorPinPositions = sensorPinAngles.map((angleDegrees, pinIndex) => {
  const pin = pinIndex + 1
  const angle = (angleDegrees * Math.PI) / 180
  return { pin, x: 4.75 * Math.cos(angle), y: 4.75 * Math.sin(angle) }
})

const headerPinX = [-3.81, -1.27, 1.27, 3.81]

/** Reproduction of the Robocraze/Amazon blue FC-22 MQ-135 breakout. */
export default function MQ135AirQualitySensorModule() {
  return (
    <board
      width="20.4mm"
      height="32.4mm"
      layers={2}
      borderRadius="0.5mm"
      thickness="1.6mm"
      solderMaskColor="blue"
      silkscreenColor="white"
      doubleSidedAssembly
      minBoardEdgeClearance="0.2mm"
    >
      <net name="VCC_5V" />
      <net name="GND" />
      <net name="AO" />
      <net name="THRESHOLD" />
      <net name="DO" />
      <net name="PWR_LED_A" />
      <net name="DO_LED_A" />
      <net name="HEATER_RETURN" />

      <schematicsection name={SENSOR_SECTION} displayName="MQ-135 sensor" />
      <schematicsection
        name={COMPARATOR_SECTION}
        displayName="Adjustable digital threshold"
      />
      <schematicsection
        name={INDICATOR_SECTION}
        displayName="Status and decoupling"
      />
      <schematicsection name={INTERFACE_SECTION} displayName="Module output" />

      <chip
        name="MQ1"
        displayName="MQ-135"
        manufacturerPartNumber="MQ135"
        datasheetUrl="https://www.winsen-sensor.com/d/files/mq135-%28ver1_6%29---manual.pdf"
        pinLabels={{
          pin1: "B1",
          pin2: "H1",
          pin3: "B2",
          pin4: "A2",
          pin5: "H2",
          pin6: "A1",
        }}
        pinAttributes={{
          B1: { mustBeConnected: true },
          H1: {
            mustBeConnected: true,
            requiresPower: true,
            requiresVoltage: "5V",
          },
          B2: { mustBeConnected: true },
          A2: { mustBeConnected: true },
          H2: { mustBeConnected: true, requiresGround: true },
          A1: { mustBeConnected: true },
        }}
        internallyConnectedPins={[
          ["pin1", "pin3"],
          ["pin4", "pin6"],
        ]}
        schPinArrangement={{
          leftSide: {
            pins: ["B1", "B2", "H1"],
            direction: "top-to-bottom",
          },
          rightSide: {
            pins: ["A1", "A2", "H2"],
            direction: "top-to-bottom",
          },
        }}
        schSectionName={SENSOR_SECTION}
        schX={-16}
        schY={3}
        schWidth={1.58}
        schHeight={0.8}
        pcbX={0}
        pcbY={3.1}
        footprint={
          <footprint>
            {sensorPinPositions.map(({ pin, x, y }) => (
              <Fragment key={pin}>
                <platedhole
                  portHints={[`pin${pin}`]}
                  pcbX={x}
                  pcbY={y}
                  shape="circle"
                  holeDiameter="1.3mm"
                  outerDiameter="2.1mm"
                />
              </Fragment>
            ))}
            <silkscreencircle radius="9.5mm" strokeWidth="0.2mm" />
          </footprint>
        }
        cadModel={{ glbUrl: mq135ModelUrl, modelBoardNormalDirection: "z+" }}
      />

      <resistor
        name="R_H"
        displayName="5R1"
        resistance="5.1ohm"
        footprint="0805"
        supplierPartNumbers={{ jlcpcb: ["C313941"] }}
        manufacturerPartNumber="CRCW08055R10FKEAHP"
        layer="bottom"
        schSectionName={SENSOR_SECTION}
        schX={-9}
        schY={6}
        schRotation={90}
        pcbX={-6.2}
        pcbY={0.5}
      />
      <resistor
        name="R_L"
        displayName="202"
        resistance="2kohm"
        footprint="0805"
        supplierPartNumbers={{ jlcpcb: ["C17604"] }}
        manufacturerPartNumber="0805W8F2001T5E"
        layer="bottom"
        schSectionName={SENSOR_SECTION}
        schX={-9}
        schY={1}
        schRotation={90}
        pcbX={-6.2}
        pcbY={-2}
      />
      <capacitor
        name="C_AO"
        capacitance="100nF"
        footprint="0805"
        supplierPartNumbers={{ jlcpcb: ["C49678"] }}
        manufacturerPartNumber="CC0805KRX7R9BB104"
        layer="bottom"
        schSectionName={SENSOR_SECTION}
        schX={-4}
        schY={1}
        schOrientation="vertical"
        pcbX={-6.2}
        pcbY={-4.3}
      />

      <potentiometer
        name="RV1"
        displayName="103"
        maxResistance="10kohm"
        pinVariant="three_pin"
        supplierPartNumbers={{ jlcpcb: ["C118956"] }}
        manufacturerPartNumber="3362P-1-103"
        layer="bottom"
        schSectionName={COMPARATOR_SECTION}
        schX={0}
        schY={5}
        pcbX={6.8}
        pcbY={7.8}
        pcbRotation={90}
        footprint={
          <footprint>
            <platedhole
              portHints={["pin1"]}
              pcbX={-2.5}
              pcbY={-1.25}
              shape="circle"
              holeDiameter="1mm"
              outerDiameter="1.8mm"
            />
            <platedhole
              portHints={["pin2"]}
              pcbX={0}
              pcbY={1.25}
              shape="circle"
              holeDiameter="1mm"
              outerDiameter="1.8mm"
            />
            <platedhole
              portHints={["pin3"]}
              pcbX={2.5}
              pcbY={-1.25}
              shape="circle"
              holeDiameter="1mm"
              outerDiameter="1.8mm"
            />
          </footprint>
        }
        cadModel={{ glbUrl: trimmerModelUrl, modelBoardNormalDirection: "z+" }}
      />

      <chip
        name="U1"
        displayName="LM393"
        manufacturerPartNumber="LM393DR2G"
        supplierPartNumbers={{ jlcpcb: ["C7955"] }}
        footprint={
          <footprint>
            {[
              { pin: 1, x: -2.7051, y: -1.905 },
              { pin: 2, x: -2.7051, y: -0.635 },
              { pin: 3, x: -2.7051, y: 0.635 },
              { pin: 4, x: -2.7051, y: 1.905 },
              { pin: 5, x: 2.7051, y: 1.905 },
              { pin: 6, x: 2.7051, y: 0.635 },
              { pin: 7, x: 2.7051, y: -0.635 },
              { pin: 8, x: 2.7051, y: -1.905 },
            ].map(({ pin, x, y }) => (
              <Fragment key={pin}>
                <smtpad
                  portHints={[`pin${pin}`]}
                  shape="pill"
                  pcbX={x}
                  pcbY={y}
                  width="1.9502mm"
                  height="0.5684mm"
                  radius="0.2842mm"
                />
              </Fragment>
            ))}
            <silkscreenrect width="4mm" height="5mm" strokeWidth="0.2mm" />
          </footprint>
        }
        cadModel={{ glbUrl: soic8ModelUrl, modelBoardNormalDirection: "z+" }}
        layer="bottom"
        pinLabels={{
          pin1: "OUTA",
          pin2: "INA_NEG",
          pin3: "INA_POS",
          pin4: "GND",
          pin5: "INB_POS",
          pin6: "INB_NEG",
          pin7: "OUTB",
          pin8: "VCC",
        }}
        pinAttributes={{
          OUTA: { doNotConnect: true },
          INA_NEG: { mustBeConnected: true },
          INA_POS: { mustBeConnected: true },
          GND: { mustBeConnected: true, requiresGround: true },
          INB_POS: { mustBeConnected: true },
          INB_NEG: { mustBeConnected: true },
          OUTB: { mustBeConnected: true },
          VCC: {
            mustBeConnected: true,
            requiresPower: true,
            requiresVoltage: "5V",
            shouldHaveDecouplingCapacitor: true,
            recommendedDecouplingCapacitorCapacitance: "1uF",
          },
        }}
        noConnect={["OUTA"]}
        schPinArrangement={{
          leftSide: {
            pins: ["INA_NEG", "INA_POS", "INB_NEG", "INB_POS"],
            direction: "top-to-bottom",
          },
          rightSide: {
            pins: ["VCC", "OUTA", "OUTB", "GND"],
            direction: "top-to-bottom",
          },
        }}
        schSectionName={COMPARATOR_SECTION}
        schX={7}
        schY={3}
        schWidth={2.245}
        schHeight={1}
        pcbX={4.3}
        pcbY={-5.2}
      />
      <resistor
        name="R_PULL"
        resistance="10kohm"
        footprint="0805"
        supplierPartNumbers={{ jlcpcb: ["C17414"] }}
        manufacturerPartNumber="0805W8F1002T5E"
        layer="bottom"
        schSectionName={COMPARATOR_SECTION}
        schX={13}
        schY={5}
        schRotation={90}
        pcbX={-0.4}
        pcbY={-10.4}
      />

      <resistor
        name="R_PWR"
        resistance="1kohm"
        footprint="0805"
        supplierPartNumbers={{ jlcpcb: ["C17513"] }}
        manufacturerPartNumber="0805W8F1001T5E"
        layer="bottom"
        schSectionName={INDICATOR_SECTION}
        schX={17}
        schY={7}
        schRotation={90}
        pcbX={-6.2}
        pcbY={9}
      />
      <led
        name="D_PWR"
        displayName="PWR"
        color="red"
        footprint="0805"
        supplierPartNumbers={{ jlcpcb: ["C84256"] }}
        manufacturerPartNumber="NCD0805R1"
        layer="bottom"
        schSectionName={INDICATOR_SECTION}
        schX={17}
        schY={3}
        schRotation={90}
        pcbX={-6.2}
        pcbY={6.6}
      />
      <resistor
        name="R_DO"
        resistance="1kohm"
        footprint="0805"
        supplierPartNumbers={{ jlcpcb: ["C17513"] }}
        manufacturerPartNumber="0805W8F1001T5E"
        layer="bottom"
        schSectionName={INDICATOR_SECTION}
        schX={22}
        schY={7}
        schRotation={90}
        pcbX={-5.5}
        pcbY={-7.2}
      />
      <led
        name="D_DO"
        displayName="DOUT"
        color="green"
        footprint="0805"
        supplierPartNumbers={{ jlcpcb: ["C2297"] }}
        manufacturerPartNumber="KT-0805G"
        layer="bottom"
        schSectionName={INDICATOR_SECTION}
        schX={22}
        schY={3}
        schRotation={90}
        pcbX={-5.5}
        pcbY={-9.5}
      />
      <capacitor
        name="C_VCC"
        capacitance="1uF"
        footprint="0805"
        supplierPartNumbers={{ jlcpcb: ["C28323"] }}
        manufacturerPartNumber="CL21B105KBFNNNE"
        layer="bottom"
        schSectionName={INDICATOR_SECTION}
        schX={27}
        schY={4.5}
        schOrientation="vertical"
        pcbX={-3.5}
        pcbY={11}
      />

      <pinheader
        name="J1"
        pinCount={4}
        pitch="2.54mm"
        gender="male"
        rightAngle
        manufacturerPartNumber="PZ254R-11-04P"
        supplierPartNumbers={{ jlcpcb: ["C492412"] }}
        pinLabels={{ pin1: "VCC", pin2: "GND", pin3: "DO", pin4: "AO" }}
        pcbPinLabels={{ pin1: "VCC", pin2: "GND", pin3: "DO", pin4: "AO" }}
        pinAttributes={{
          VCC: {
            providesPower: true,
            providesVoltage: "5V",
            includeInBoardPinout: true,
          },
          GND: { providesGround: true, includeInBoardPinout: true },
          DO: { includeInBoardPinout: true },
          AO: { includeInBoardPinout: true },
        }}
        schFacingDirection="left"
        schSectionName={INTERFACE_SECTION}
        schX={33}
        schY={3}
        schWidth={0.485}
        pcbX={0}
        pcbY={-14.4}
        footprint={
          <footprint insertionDirection="from_bottom">
            {headerPinX.map((x, pinIndex) => (
              <Fragment key={pinIndex}>
                <platedhole
                  portHints={[`pin${pinIndex + 1}`]}
                  pcbX={x}
                  pcbY={0}
                  shape="circle"
                  holeDiameter="1.1mm"
                  outerDiameter="1.8mm"
                />
              </Fragment>
            ))}
          </footprint>
        }
        cadModel={{
          glbUrl: rightAngleHeaderModelUrl,
          modelBoardNormalDirection: "z+",
        }}
      />

      <trace name="MQ_A1_VCC" from=".MQ1 > .A1" to="net.VCC_5V" />
      <trace name="MQ_A2_VCC" from=".MQ1 > .A2" to="net.VCC_5V" />
      <trace name="MQ_B1_AO" from=".MQ1 > .B1" to="net.AO" />
      <trace name="MQ_B2_AO" from=".MQ1 > .B2" to="net.AO" />
      <trace name="MQ_H1_VCC" from=".MQ1 > .H1" to="net.VCC_5V" />
      <trace name="MQ_H2_RETURN" from=".MQ1 > .H2" to="net.HEATER_RETURN" />
      <trace name="RH_RETURN" from=".R_H > .pin1" to="net.HEATER_RETURN" />
      <trace name="RH_GND" from=".R_H > .pin2" to="net.GND" />
      <trace name="RL_AO" from=".R_L > .pin1" to="net.AO" />
      <trace name="RL_GND" from=".R_L > .pin2" to="net.GND" />
      <trace name="CAO_AO" from=".C_AO > .pin1" to="net.AO" />
      <trace name="CAO_GND" from=".C_AO > .pin2" to="net.GND" />

      <trace name="RV1_VCC" from=".RV1 > .pin1" to="net.VCC_5V" />
      <trace name="RV1_REF" from=".RV1 > .pin2" to="net.THRESHOLD" />
      <trace name="RV1_GND" from=".RV1 > .pin3" to="net.GND" />
      <trace name="U1_VCC" from=".U1 > .VCC" to="net.VCC_5V" />
      <trace name="U1_GND" from=".U1 > .GND" to="net.GND" />
      <trace name="U1_INA_NEG" from=".U1 > .INA_NEG" to="net.VCC_5V" />
      <trace name="U1_INA_POS" from=".U1 > .INA_POS" to="net.GND" />
      <trace name="U1_INB_NEG" from=".U1 > .INB_NEG" to="net.AO" />
      <trace name="U1_INB_POS" from=".U1 > .INB_POS" to="net.THRESHOLD" />
      <trace name="U1_OUTB" from=".U1 > .OUTB" to="net.DO" />
      <trace name="RPULL_VCC" from=".R_PULL > .pin1" to="net.VCC_5V" />
      <trace name="RPULL_DO" from=".R_PULL > .pin2" to="net.DO" />

      <trace name="RPWR_VCC" from=".R_PWR > .pin1" to="net.VCC_5V" />
      <trace name="RPWR_LED" from=".R_PWR > .pin2" to="net.PWR_LED_A" />
      <trace name="DPWR_A" from=".D_PWR > .anode" to="net.PWR_LED_A" />
      <trace name="DPWR_K" from=".D_PWR > .cathode" to="net.GND" />
      <trace name="RDO_VCC" from=".R_DO > .pin1" to="net.VCC_5V" />
      <trace name="RDO_LED" from=".R_DO > .pin2" to="net.DO_LED_A" />
      <trace name="DDO_A" from=".D_DO > .anode" to="net.DO_LED_A" />
      <trace name="DDO_K" from=".D_DO > .cathode" to="net.DO" />
      <trace name="CVCC_VCC" from=".C_VCC > .pin1" to="net.VCC_5V" />
      <trace name="CVCC_GND" from=".C_VCC > .pin2" to="net.GND" />

      <trace name="J1_VCC" from=".J1 > .VCC" to="net.VCC_5V" />
      <trace name="J1_GND" from=".J1 > .GND" to="net.GND" />
      <trace name="J1_DO" from=".J1 > .DO" to="net.DO" />
      <trace name="J1_AO" from=".J1 > .AO" to="net.AO" />

      <platedhole
        name="H1"
        shape="circle"
        holeDiameter="3mm"
        outerDiameter="4mm"
        pcbX={-7.5}
        pcbY={13.5}
      />
      <platedhole
        name="H2"
        shape="circle"
        holeDiameter="3mm"
        outerDiameter="4mm"
        pcbX={7.5}
        pcbY={13.5}
      />
      <platedhole
        name="H3"
        shape="circle"
        holeDiameter="3mm"
        outerDiameter="4mm"
        pcbX={-7.5}
        pcbY={-13.5}
      />
      <platedhole
        name="H4"
        shape="circle"
        holeDiameter="3mm"
        outerDiameter="4mm"
        pcbX={7.5}
        pcbY={-13.5}
      />

      <silkscreentext
        text="MQ-135"
        pcbX={0}
        pcbY={-8.8}
        fontSize="0.8mm"
        anchorAlignment="center"
      />
      <silkscreentext
        text="FC-22"
        layer="bottom"
        pcbX={-0.8}
        pcbY={1.8}
        fontSize="1mm"
        anchorAlignment="center"
      />
      <silkscreentext
        text="AO  DO  GND  VCC"
        layer="bottom"
        pcbX={0}
        pcbY={-12.6}
        fontSize="0.58mm"
        anchorAlignment="center"
      />
      <silkscreentext
        text="PWR"
        layer="bottom"
        pcbX={-6.2}
        pcbY={7.9}
        fontSize="0.55mm"
        anchorAlignment="center"
      />
      <silkscreentext
        text="DOUT"
        layer="bottom"
        pcbX={-5.5}
        pcbY={-8.35}
        fontSize="0.5mm"
        anchorAlignment="center"
      />
    </board>
  )
}