#include <SPI.h>
// C++ code
//
int ledPin = 11;
int inputPin = 2;
int pirState = LOW;
int val = 0;
// choose the pin for the LED
// choose the input pin (for PIR sensor)
// we start, assuming no motion detected
// variable for reading the pin status
void setup() {
pinMode(ledPin, OUTPUT);
// declare LED as output
pinMode(inputPin, INPUT);
// declare sensor as input
Serial.begin(9600);
}
void loop(){
val = digitalRead(inputPin); // read input value
if (val == HIGH) {
// check if the input is HIGH
digitalWrite(ledPin, HIGH); // turn LED ON
if (pirState == LOW) {
// we have just turned on
Serial.println("Motion detected!");
// We only want to print on the output change, not state
pirState = HIGH;
}
} else {
digitalWrite(ledPin, LOW); // turn LED OFF
if (pirState == HIGH){
// we have just turned of
Serial.println("Motion ended!");
// We only want to print on the output change, not state
pirState = LOW;
}
}
}
void setup()
{
Serial.begin(9600);
pinMode(7, OUTPUT);
}
void loop()
{
int c = analogRead(A0);
Serial.println(c);
if(c<900){
digitalWrite(7, LOW);
}else
{
digitalWrite(7,HIGH);
}
}
int ledPin = 8;
int Sensor = A2;
void setup()
{
pinMode(Sensor, INPUT);
pinMode(ledPin, OUTPUT);
Serial.begin(9600);
}
void loop(){
Serial.println("MQ5 Heating Up!");
delay(4000);
int gas_value = analogRead(Sensor);
Serial.print("Sensor Value:");
Serial.println(gas_value);
if (gas_value > 450) {
digitalWrite(ledPin, HIGH);
}
else{
digitalWrite(ledPin, LOW);
}
}
int ledPin = 8;
int Sensor = A1;
int ledPin1 = 11;
int inputPin = 2;
int pirState = LOW;
int val = 0;
void setup()
{
pinMode(Sensor, INPUT);
pinMode(ledPin, OUTPUT);
pinMode(7, OUTPUT);
pinMode(ledPin1, OUTPUT);
pinMode(inputPin, INPUT);
Serial.begin(9600);
}
void loop()
{
Serial.println("MQ5 Heating Up!");
delay(4000); // allow the MQ5 to warm up
int gas_value = analogRead(Sensor);
Serial.print("Sensor Value:");
Serial.println(gas_value);
if (gas_value > 450) {
digitalWrite(ledPin, HIGH);
}
else{
digitalWrite(ledPin, LOW);
}
int c = analogRead(A0);
Serial.println(c);
if(c<500){
digitalWrite(7, LOW);
}else
{
digitalWrite(7,HIGH);
}
val = digitalRead(inputPin);
if (val == HIGH) {
digitalWrite(ledPin, HIGH);
if (pirState == LOW) {
Serial.println("Motion detected!");
pirState = HIGH;
}
} else {
digitalWrite(ledPin1, LOW); // turn LED OFF
if (pirState == HIGH){
Serial.println("Motion ended!");
pirState = LOW;
}
}
}
GAZ DATCHIK VA PHOTORESISTOR
int ledPin = 8;
int Sensor = A2;
void setup()
{
Serial.begin(9600);
pinMode(7, OUTPUT);
pinMode(Sensor, INPUT);
pinMode(ledPin, OUTPUT);
}
void loop(){
int c = analogRead(A0);
Serial.println(c);
if(c<900){
digitalWrite(7, LOW);
}else
{
digitalWrite(7,HIGH);
}
Serial.println("MQ5 Heating Up!");
delay(4000);
int gas_value = analogRead(Sensor);
Serial.print("Sensor Value:");
Serial.println(gas_value);
if (gas_value > 450) {
digitalWrite(ledPin, HIGH);
}
else{
digitalWrite(ledPin, LOW);
}
}
//10:08:01.628 -> In hex: 30 89 14 1C
//10:08:01.628 -> In dec: 48 137 20 28
#include <SPI.h>
#include <MFRC522.h>
#define SS_PIN 10
#define RST_PIN 9
MFRC522 mfrc522(SS_PIN, RST_PIN);
void setup()
{
Serial.begin(9600);
SPI.begin();
mfrc522.PCD_Init();
Serial.println("Approximate your card to the reader...");
Serial.println();
pinMode (6, OUTPUT);
pinMode (7, OUTPUT);
digitalWrite(7,LOW);
digitalWrite(6, LOW);
}
void loop()
{
String content= "";
// Scan for cards
if ( ! mfrc522.PICC_IsNewCardPresent())
{
return;
}
// Selects a card
if ( ! mfrc522.PICC_ReadCardSerial())
{
return;
}
//show UID on serial monitor
Serial.print("UID tag :");
for (byte i = 0; i < mfrc522.uid.size; i++)
{
Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
Serial.print(mfrc522.uid.uidByte[i], HEX);
content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
content.concat(String(mfrc522.uid.uidByte[i], HEX));
}
Serial.println();
Serial.print("Message : ");
content.toUpperCase();
if ((content.substring(1) == "30 89 14 1C") ) //change the codes with the cards
codes found after scanning in serial monitor
{
Serial.println("Authorized access");
Serial.println();
digitalWrite (7,HIGH);
delay(3000);
digitalWrite (7,LOW);
delay(3000);
}
else {
Serial.println(" Access denied");
digitalWrite (6,HIGH);
delay(3000);
digitalWrite (6, LOW);
delay(3000);
}
}
https://www.deviceplus.com/arduino/diy-home-security-make-a-laser-tripwireusing-arduino/
const int photo = 7;
const int LED = 9;
void setup() {
//Pin Configurations
//Outputs
pinMode(LED, OUTPUT);
digitalWrite(LED, LOW);
//Inputs
pinMode(photo, INPUT_PULLUP);
}
void loop() {
//if/else loop checks if photoresistor is high or low
if(digitalRead(photo)==HIGH){
digitalWrite(LED, HIGH);
}else{
digitalWrite(LED, LOW);
}
}
const int TRIG_PIN = 6; // Arduino pin connected to Ultrasonic Sensor's TRIG pin
const int ECHO_PIN = 7; // Arduino pin connected to Ultrasonic Sensor's ECHO
pin
const int LED_PIN = 3; // Arduino pin connected to LED's pin
const int DISTANCE_THRESHOLD = 50; // centimeters
// variables will change:
float duration_us, distance_cm;
void setup() {
Serial.begin (9600);
// initialize serial port
pinMode(TRIG_PIN, OUTPUT); // set arduino pin to output mode
pinMode(ECHO_PIN, INPUT); // set arduino pin to input mode
pinMode(LED_PIN, OUTPUT); // set arduino pin to output mode
}
void loop() {
// generate 10-microsecond pulse to TRIG pin
digitalWrite(TRIG_PIN, HIGH);
delayMicroseconds(10);
digitalWrite(TRIG_PIN, LOW);
// measure duration of pulse from ECHO pin
duration_us = pulseIn(ECHO_PIN, HIGH);
// calculate the distance
distance_cm = 0.017 * duration_us;
if(distance_cm < DISTANCE_THRESHOLD)
digitalWrite(LED_PIN, HIGH); // turn on LED
else
digitalWrite(LED_PIN, LOW); // turn off LED
// print the value to Serial Monitor
Serial.print("distance: ");
Serial.print(distance_cm);
Serial.println(" cm");
delay(500);
}