Rx-Code-Final-18-4-2021

#include <RH_ASK.h>
#include <SPI.h> // Not actualy used but needed to compile

// defines pins numbers for ultrasonic
const int trigPin = 2;
const int echoPin = 3;
const int buzzer = 12;//used to be 11 now it is 12 [11 for receiver]
const int ledPin = 13;
// defines pins numbers for LDR
const int ldr_pin = 7;
const int led_pin = 4;
//  Project by - Be innovative with Prasad
//   title - ultrasonic sensor project with buzzer and Arduino
// defines variables
long duration;
int distance;
int safetyDistance;

int mss = 0;
uint8_t buf[RH_ASK_MAX_MESSAGE_LEN];
uint8_t buflen = sizeof(buf);
RH_ASK driver;

void setup() {
  //ultrasonic
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input
  pinMode(buzzer, OUTPUT);
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600); // Starts the serial communication
  // put your setup code here, to run once:LDR
  pinMode(ldr_pin, INPUT);
  pinMode(led_pin, OUTPUT);
  Serial.begin(9600);
  if (!driver.init())Serial.println("init failed");
}
void loop() {
  int j = 5;
  // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  // Calculating the distance
  distance = duration * 0.034 / 2;
  Serial.print("Distance: ");
  Serial.println(distance);
  safetyDistance = distance;
  //Prints the distance on the Serial Monitor
  if (safetyDistance <= 150 && safetyDistance >= 5) // You can change safe distance from here changing value Ex. 20 , 40 , 60 , 80 , 100, all in cm
  {
    j = safetyDistance * j;
    digitalWrite(buzzer, HIGH);
    digitalWrite(ledPin, HIGH);
    delay(j);
    digitalWrite(buzzer, LOW);
    digitalWrite(ledPin, LOW);
    delay(j);
  }
  delay(1);
  // put your main code here, to run repeatedly:LDR
   if ( digitalRead( ldr_pin ) == 1) {
     if (driver.recv(buf, &buflen)) // Non-blocking
     {
       int i;

       // Message with a good checksum received, dump it.
       driver.printBuffer("Got:", buf, buflen);
       mss = atoi(buf);
     }
     Serial.print("mss is set to :");
     Serial.println(mss);
     if (mss == 1) {
       digitalWrite( led_pin, LOW);
     }
     else {
       digitalWrite( led_pin, HIGH);
     }
    }
    else {
     digitalWrite( led_pin , LOW);
    }
    Serial.println( digitalRead( ldr_pin ));
    delay(100);
}                                   //  Project by - Be innovative with Prasad
//   title - ultrasonic sensor project with buzzer and Arduino