yashashbm-lang

#include <Servo.h>

const int TRIG_PIN = 9;
const int ECHO_PIN = 10;
const int SERVO_PIN = 3;
const int LED_PIN   = 6;

// --- Door angles ---
const int DOOR_CLOSED_ANGLE = 90;   // closed at 90°
const int DOOR_OPEN_ANGLE   = 0;    // open at 0°

yashashbm-lang

// Arduino Project: Fast Beeping Active Buzzer with Potentiometer
// Author: YASHASH BM

int buzzer = 8;   // Active buzzer connected to D8
int pot = A0;     // Potentiometer connected to A0

void setup() {
  pinMode(buzzer, OUTPUT);
}

yashashbm-lang

#define trigPin 9
#define echoPin 10

// Street light LEDs (you can add/remove pins here)
int leds[] = {3, 4, 5, 6, 7};  
int ledCount = 5;

long duration;
int distance;

yashashbm-lang

#include <Servo.h>

Servo myServo;

const int potPin = A0;    // potentiometer middle pin
const int servoPin = 9;   // servo signal pin

// SG90 safe pulse range
const int minPWM = 500;   // ~0°
const int maxPWM = 2400;  // ~160-170°

yashashbm-lang

#include <Servo.h>

Servo lidServo;

int trigPin = 2;
int echoPin = 3;
int servoPin = 9;

long duration;
int distance;

yashashbm-lang

int ledPins[] = {2, 3, 4, 5};
int ledCount = 4;

void setup() {
  for (int i = 0; i < ledCount; i++) {
    pinMode(ledPins[i], OUTPUT);
    digitalWrite(ledPins[i], LOW);
  }
  randomSeed(analogRead(A0)); // use A0 as seed
}

yashashbm-lang

int probePin = 2;   // Probe input
int buzzer   = 3;   // Buzzer output

void setup() {
  pinMode(probePin, INPUT_PULLUP); // Keep pin HIGH until water touches
  pinMode(buzzer, OUTPUT);
}

void loop() {
  int water = digitalRead(probePin);

yashashbm-lang

// 4-light staircase with HC-SR04 (500 ms step delay, 5s hold time)
const int trigPin = 9;
const int echoPin = 10;
const int leds[] = {2, 3, 4, 5};  // 4 LEDs

const unsigned long holdTime = 5000UL; // keep lights on this long after last detection (5 seconds)
const unsigned long stepDelay = 500UL; // delay between lighting each LED (500 ms)
const int detectDistance = 50; // cm threshold

unsigned long lastDetectTime = 0;