rushabhcodes/Attiny85-Arcade-Keychain

index.circuit.tsx

PCB

Schematic

/**
 * ATtiny85 Arcade — "Armour Grade" gamepad keychain, rev 1.1
 *
 * A tscircuit recreation of the reference design
 * (Attiny_Arcader_game_rev_1.1 schematic + Attiny-Arcade_Keychain_2.0 Gerbers).
 *
 * How it works
 *   A CR2032 on the underside feeds the board through the SK-12D02VG3 slide switch.
 *   The ATtiny85 talks software-I2C to a 4-pin 0.96" OLED module on PB3/PB4,
 *   reads two Kailh Choc keyswitches on PB0/PB2 (10k pull-downs), and drives a
 *   Murata piezo from PB1 through an SN74LVC2G04 dual inverter wired as a
 *   bridge-tied load — 1Y and 2Y swing in antiphase, so the transducer sees
 *   ~2x the rail.
 *   PB5/RESET is deliberately left floating so the part stays ISP-programmable.
 *
 * Every PCB coordinate is lifted from the reference Gerbers and re-referenced
 * to the board centre at (176.848 mm, -59.9235 mm) in the original artwork.
 */
import type { ChipProps } from "tscircuit";
import {
  BOARD_OUTLINE,
  KEYCHAIN_CUTOUT,
  KEYCHAIN_CUTOUT_CENTER,
} from "./board-outline";
import { ATTINY85_20PU } from "./imports/ATTINY85_20PU";
import { PKLCS1212E2000_R1 } from "./imports/PKLCS1212E2000_R1";
import { SN74LVC2G04DBVR } from "./imports/SN74LVC2G04DBVR";
import { SK_12D02VG3 } from "./imports/SK_12D02VG3";
import { CPG135001D03 } from "./imports/CPG135001D03";
import { CoinCellHolder3003 } from "./imports/CoinCellHolder3003";
import { OledDisplay } from "./imports/OledDisplay";

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/**
 * The registry part ships generic pin1..pin8 labels. Re-label them so the
 * traces below can talk in PBn terms, and re-type the component so those
 * names are what the compiler checks the selectors against.
 */
const ATTINY85_PIN_LABELS = {
  pin1: ["PB5", "RESET"],
  pin2: ["PB3", "XTAL1"],
  pin3: ["PB4", "XTAL2"],
  pin4: "GND",
  pin5: ["PB0", "MOSI", "AREF"],
  pin6: ["PB1", "MISO", "OC0B"],
  pin7: ["PB2", "SCK", "INT0"],
  pin8: "VCC",
} as const;

const Attiny85 = ATTINY85_20PU as (
  props: ChipProps<typeof ATTINY85_PIN_LABELS>,
) => ReturnType<typeof ATTINY85_20PU>;

export default () => (
  <board
    outline={BOARD_OUTLINE}
    layers={2}
    thickness="1.6mm"
    title="ATtiny85 Arcade Keychain"
    minViaHoleDiameter="0.3mm"
    minViaPadDiameter="0.45mm"
  >
    <schematicsection name="Power" displayName="Power" />
    <schematicsection name="MCU" displayName="ATtiny85" />
    <schematicsection name="Display" displayName="OLED" />
    <schematicsection name="Buttons" displayName="Buttons" />
    <schematicsection name="Audio" displayName="Audio" />

    {/* ---------------- Power ---------------- */}
    <CoinCellHolder3003
      name="BT1"
      schSectionName="Power"
      schX={-20}
      schY={5}
      layer="bottom"
      pcbX={0.0122}
      pcbY={-1.2397}
      doNotPlace
    />
    <SK_12D02VG3
      name="S1"
      schSectionName="Power"
      schX={-24}
      schY={5}
      pcbX={-0.064}
      pcbY={16.4735}
      pcbRotation={180}
    />
    <capacitor
      name="C1"
      capacitance="100nF"
      footprint="0805"
      schSectionName="Power"
      schX={-24}
      schY={-1}
      schOrientation="vertical"
      pcbX={4.508}
      pcbY={-11.3235}
    />
    <capacitor
      name="C2"
      capacitance="100nF"
      footprint="0805"
      schSectionName="Power"
      schX={-20}
      schY={-1}
      schOrientation="vertical"
      pcbX={-4.508}
      pcbY={-11.3235}
      />

    {/* ---------------- MCU ---------------- */}
    <Attiny85
      name="IC1"
      pinLabels={ATTINY85_PIN_LABELS}
      schPinArrangement={{
        leftSide: {
          pins: ["PB5", "PB3", "PB4", "GND"],
          direction: "top-to-bottom",
        },
        rightSide: {
          pins: ["VCC", "PB2", "PB1", "PB0"],
          direction: "top-to-bottom",
        },
      }}
      schSectionName="MCU"
      schX={-3}
      schY={2}
      pcbX={24.828}
      pcbY={13.9495}
      pcbRotation={-90}
    />

    {/* ---------------- Display ---------------- */}
    <OledDisplay
      name="U1"
      schSectionName="Display"
      schX={-11}
      schY={2}
      pcbX={0}
      pcbY={11.5266}
    />

    {/* ---------------- Buttons ---------------- */}
    <resistor
      name="R1"
      resistance="10k"
      footprint="1206"
      schSectionName="Buttons"
      schX={6}
      schY={5}
      schRotation={90}
      pcbX={14.922}
      pcbY={-7.6405}
    />
    <CPG135001D03
      name="SW1"
      schSectionName="Buttons"
      schX={10}
      schY={7}
      pcbX={25}
      pcbY={-2.5}
    />
    <resistor
      name="R2"
      resistance="10k"
      footprint="1206"
      schSectionName="Buttons"
      schX={6}
      schY={-1}
      schRotation={90}
      pcbX={-14.2}
      pcbY={-7.5135}
    />
    <CPG135001D03
      name="SW2"
      schSectionName="Buttons"
      schX={10}
      schY={1}
      pcbX={-25}
      pcbY={-2.5}
    />

    {/* ---------------- Audio ---------------- */}
    <SN74LVC2G04DBVR
      name="IC2"
      schPinArrangement={{
        leftSide: { pins: ["VCC", "1A", "2A"], direction: "top-to-bottom" },
        rightSide: { pins: ["GND", "1Y", "2Y"], direction: "top-to-bottom" },
      }}
      schSectionName="Audio"
      schX={-6.06}
      schY={-9}
      pcbX={-0.084}
      pcbY={-10.3685}
      pcbRotation={180}
    />
    {/* Murata PKLCS1212E2000 in place of the reference CPT-1203-78-SMT-TR:
        same 12 mm body sitting over the battery holder, pin 1 to the left. */}
    <PKLCS1212E2000_R1
      name="LS1"
      schSectionName="Audio"
      schX={-0.21}
      schY={-10.27}
      pcbX={0.063}
      pcbY={-1.2905}
    />

    {/* ---------------- Mechanical ---------------- */}
    {/* Mounting holes are already treated as autorouter obstacles. */}
    <hole name="MH1" diameter="2.9mm" pcbX={-11.5} pcbY={11.5} />
    <hole name="MH2" diameter="2.9mm" pcbX={11.5} pcbY={11.5} />
    <hole name="MH3" diameter="2.9mm" pcbX={-11.7} pcbY={-12.3} />
    <hole name="MH4" diameter="2.9mm" pcbX={11.7} pcbY={-12.3} />
    <cutout
      shape="polygon"
      points={KEYCHAIN_CUTOUT}
      pcbX={KEYCHAIN_CUTOUT_CENTER.x}
      pcbY={KEYCHAIN_CUTOUT_CENTER.y}
    />

    {/* ---------------- Silkscreen ---------------- */}
    <silkscreentext text="ON" fontSize={2.4} pcbX={-8.9} pcbY={18.7} />
    <silkscreentext text="OFF" fontSize={2.4} pcbX={8.9} pcbY={18.7} />
    <silkscreengraphic
      imageUrl={tscircuitLogoSvg}
      width="10mm"
      height="10mm"
      pcbX={-19}
      pcbY={15}
    />
    <silkscreentext
      text="made by rushabhcodes"
      layer={"bottom"}
      fontSize={1.4}
      pcbX={0}
      pcbY={-15}
    />

    {/* ---------------- Power distribution ---------------- */}
    <trace from=".BT1 > .plus" to=".S1 > .COM" />
    <trace from=".BT1 > .minus" to="net.GND" />
    <trace from=".S1 > .NC" to="net.V3" />

    <trace from=".IC1 > .VCC" to="net.V3" />
    <trace from=".IC1 > .GND" to="net.GND" />
    <trace from=".IC2 > .VCC" to="net.V3" />
    <trace from=".IC2 > .GND" to="net.GND" />
    <trace from=".U1 > .VDD" to="net.V3" />
    <trace from=".U1 > .GND" to="net.GND" />
    <trace from=".C1 > .pin1" to="net.V3" />
    <trace from=".C1 > .pin2" to="net.GND" />
    <trace from=".C2 > .pin1" to="net.V3" />
    <trace from=".C2 > .pin2" to="net.GND" />

    {/* ---------------- OLED (software I2C) ---------------- */}
    <trace from=".IC1 > .PB3" to=".U1 > .SDA" />
    <trace from=".IC1 > .PB4" to=".U1 > .SCK" />

    {/* ---------------- Buttons: switch to +3V, 10k pull-down ---------------- */}
    <trace from=".SW1 > .pin1" to="net.V3" />
    <trace from=".SW1 > .pin2" to=".IC1 > .PB2" />
    <trace from=".R1 > .pin2" to=".IC1 > .PB2" />
    <trace from=".R1 > .pin1" to="net.GND" />

    <trace from=".SW2 > .pin1" to="net.V3" />
    <trace from=".SW2 > .pin2" to=".IC1 > .PB0" />
    <trace from=".R2 > .pin2" to=".IC1 > .PB0" />
    <trace from=".R2 > .pin1" to="net.GND" />

    {/* ---------------- Audio: bridge-tied piezo drive ---------------- */}
    <trace from=".IC1 > .PB1" to=".IC2 > .1A" />
    <trace from=".IC2 > .1Y" to=".IC2 > .2A" />
    <trace from=".IC2 > .1Y" to=".LS1 > .pin2" />
    <trace from=".IC2 > .2Y" to=".LS1 > .pin1" />

    {/* Ground pour on both layers, matching the reference artwork. */}
    <copperpour connectsTo="net.GND" layer="top" />
    <copperpour connectsTo="net.GND" layer="bottom" />
  </board>
);