jian1 — Arduino Mega simulation

An interactive Arduino Mega circuit simulation you can run free in your browser on Velxio, by mj9178666.

Components

Sketch code

#include <Keypad.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <LedControl.h>
#include <DHT.h>
#include <Servo.h>

// ================= 引脚定义 =================
// 1. 矩阵键盘
const byte ROWS = 4, COLS = 4;
char keys[ROWS][COLS] = {
  {'1','2','3','A'}, {'4','5','6','B'},
  {'7','8','9','C'}, {'*','0','#','D'}
};
byte rowPins[ROWS] = {9, 8, 7, 6};
byte colPins[COLS] = {5, 4, 3, 2};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

// 2. OLED
Adafruit_SSD1306 display(128, 64, &Wire, -1);

// 3. 点阵屏 (DIN=51, CLK=52, CS=53)
LedControl lc = LedControl(51, 52, 53, 1);

// 4. 传感器与执行器
#define DHTPIN 22
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

const int PIR_PIN = 23;
const int LDR_PIN = A0;
const int MQ2_PIN = A1;

const int BTN_DOOR = 24;   // 门铃
const int BTN_SOS = 25;    // 紧急求助

const int RELAY_FAN = 26;  // 风扇继电器
const int BUZZER = 28;     // 蜂鸣器
const int LED_STATUS = 29; // 状态指示灯 (新增的第7个输出)
const int SERVO_PIN = 11;  // 窗帘舵机

const int PIN_R = 44;      // RGB 照明灯
const int PIN_G = 45;
const int PIN_B = 46;

Servo curtain;

// ================= 系统变量 =================
String inputPassword = "";
const String MASTER_PWD = "1234";
bool armed = false;
int pwdErrorCount = 0;

// 非阻塞定时器变量
unsigned long lastEnvRead = 0;
unsigned long lastBlink = 0;
unsigned long lastAlarmBeep = 0;
bool ledBlinkState = false;
bool isAlarming = false;
String alarmSource = "";

// 点阵报警图标 (感叹号)
byte alarmIcon[8] = {0x18, 0x18, 0x18, 0x18, 0x18, 0x00, 0x18, 0x00};

void setup() {
  Serial.begin(9600);
  dht.begin();
  
  // 输入引脚配置
  pinMode(PIR_PIN, INPUT);
  pinMode(BTN_DOOR, INPUT_PULLUP);
  pinMode(BTN_SOS, INPUT_PULLUP);
  
  // 输出引脚配置
  pinMode(RELAY_FAN, OUTPUT);
  pinMode(BUZZER, OUTPUT);
  pinMode(LED_STATUS, OUTPUT);
  pinMode(PIN_R, OUTPUT);
  pinMode(PIN_G, OUTPUT);
  pinMode(PIN_B, OUTPUT);
  
  digitalWrite(RELAY_FAN, LOW);
  digitalWrite(BUZZER, LOW);
  digitalWrite(LED_STATUS, LOW);
  
  curtain.attach(SERVO_PIN);
  curtain.write(0); // 初始窗帘关闭

  // OLED 初始化
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println("Smart Home System");
  display.println("Status: DISARMED");
  display.println("Enter Pwd + '#'");
  display.display();

  // 点阵初始化
  lc.shutdown(0, false);
  lc.setIntensity(0, 8);
  lc.clearDisplay(0);
  Serial.begin(9600);
// ... 其他初始化代码 ...
Serial.println("=== Smart Home System Started ===");
}

void loop() {
  // 1. 处理矩阵键盘输入
  char key = keypad.getKey();
  if (key) handleKeypad(key);

  // 2. 处理独立按键（门铃和SOS）
  if (digitalRead(BTN_DOOR) == LOW) {
    tone(BUZZER, 1000, 200); // 门铃短鸣
    delay(300); // 简单防抖
  }
  if (digitalRead(BTN_SOS) == LOW) {
    if (!armed) {
      armed = true; // 紧急求助自动布防并报警
      triggerAlarm("SOS BUTTON");
    }
    delay(300);
  }

  // 3. 状态指示灯控制
  if (armed) {
    // 布防状态：指示灯慢闪
    if (millis() - lastBlink > 1000) {
      lastBlink = mi

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