作业2 — Arduino Mega simulation

An interactive Arduino Mega circuit simulation you can run free in your browser on Velxio, by leikz.

Components

Sketch code

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#include <Servo.h>
#include <Adafruit_NeoPixel.h>

// ============================================================
// 智能家居 + 智能门锁 二合一 (Arduino MEGA2560)
//
// 门锁：键盘输入密码 1234，# 确认，* 清除
//   密码对  -> LCD "Welcome Home!"，撤防，矩阵灯欢迎
//   密码错  -> LCD "Wrong Password!"，连续错 3 次蜂鸣器报警 5 秒
// 布防(锁定)：PIR + 超声波 2 米内 -> 入侵报警(红灯闪+蜂鸣器)
// 撤防(解锁)：有人靠近 -> 矩阵灯亮 15 秒；按 * 重新布防
// 常驻功能：光敏自动窗帘(带回差)、过温报警(红灯闪+蜂鸣器)
// ============================================================

// ---------- 引脚 (MEGA2560) ----------
// 键盘实际接线：R1-R4 -> D9 D8 D7 D6，C1-C4 -> D5 D4 D3 D2
const byte ROW_PINS[4] = {9, 8, 7, 6};    // 键盘行 R1~R4
const byte COL_PINS[4] = {5, 4, 3, 2};    // 键盘列 C1~C4
const int PIN_PIR    = 10;
const int PIN_DHT    = 11;
const int PIN_TRIG   = 12;
const int PIN_ECHO   = 13;
const int PIN_LDR    = A0;
// LCD I2C: SDA=D20, SCL=D21
const int PIN_LED_R  = 22;
const int PIN_LED_G  = 23;
const int PIN_LED_Y  = 24;
const int PIN_BUZZER = 26;
const int PIN_NEO    = 30;
const int PIN_SERVO  = 44;
const int NEO_NUM    = 64;

const char KEYS[4][4] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

// ---------- 密码 ----------
const char PASSWORD[] = "1234";
char input[9];
byte inLen = 0;
byte wrongCount = 0;

// ---------- 阈值 ----------
const int   LIGHT_DARK    = 400;   // 窗帘：低于此值关
const int   LIGHT_BRIGHT  = 500;   // 窗帘：高于此值开
const int   LIGHT_MATRIX  = 15;    // 矩阵灯：低于此值才算"暗"（Velxio 实测：暗态 12，226lux 为 21）
const float TEMP_HIGH     = 30.0;
const float HUMI_HIGH     = 80.0;
const int   DIST_NEAR     = 200;    // 2 米
const int   CURTAIN_OPEN  = 0;
const int   CURTAIN_CLOSE = 90;
const unsigned long HOLD_MS = 10000;      // 矩阵灯保持 10 秒
const unsigned long WRONG_ALARM_MS = 5000; // 3 次错误报警 5 秒

LiquidCrystal_I2C lcd(0x27, 16, 2);
DHT  dht(PIN_DHT, DHT22);
Servo curtain;
Adafruit_NeoPixel leds(NEO_NUM, PIN_NEO, NEO_GRB + NEO_KHZ800);

unsigned long tDht = 0, tLcd = 0, tBlink = 0, tSerial = 0, tLed = 0;
float temp = NAN, humi = NAN;
int   lightVal = 0, dist = 0;
bool  presence = false, overheat = false, intruder = false;
bool  ledR = false;
int   curtainAngle = -1, glow = 0;
bool  curtainClosed = false;

unsigned long tDetect = 0;
bool  detectedOnce = false, personNear = false, matrixOn = false;

unsigned long tServoOff = 0;
bool  servoAttached = true;

// ---------- 门锁状态 ----------
bool  locked = true;               // 上电默认布防
unsigned long tMsg = 0;            // 提示消息截止时间
char  msg1[17] = "", msg2[17] = "";
unsigned long tWrongAlarm = 0;     // 3 次错误报警截止时间

int readLight() {
  return analogRead(PIN_LDR);
}

int readDistance() {
  digitalWrite(PIN_TRIG, LOW);
  delayMicroseconds(2);
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);
  long us = pulseIn(PIN_ECHO, HIGH, 30000);
  if (us == 0) return 999;
  return (int)(us * 0.034 / 2);
}

void setCurtain(int angle) {
  if (curtainAngle == angle) return;
  curtainAngle = angle;
  if (!servoAttac

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