The Arduino code for the Arduino Nano that Receives an RF signal to switch on a relay

CHAIN_BLOCKS_Receiver.ino

/* ===============================================================
      Project: CHAIN BLOCKS : 433MHz Receiver with Relay and Motor
       Author: Scott C
      Created: 26th Feb 2017
  Arduino IDE: 1.8.1
      Website: http://arduinobasics.blogspot.com.au
  Description: Use the 433Mhz RF receiver to receive a signal. The Arduino
               will process this signal and will trigger a relay
               based on the result of the signal. A motor is attached to the
               relay for extra effect.
================================================================== */

#define relay 10              //Connect relay module signal pin to Arduino digital pin 10

long mySignal=0;              //This variable holds the signal value
int reps = 200;               //Increase the number of repetitions (Reps) for greater accuracy
boolean trigger = false;      //The relay will switch when the "trigger" is true
boolean lastTrigger = false;  //Hold the state of the last Trigger value
int threshold = 325;          //If mySignal is greater than this threshold, it will trigger the relay


/* ================================================================
 *  SETUP ()
 ================================================================== */
void setup() {
  pinMode(relay, OUTPUT);
  Serial.begin(9600);
}


/* ================================================================
 *  LOOP ()
 ================================================================== */
void loop() {
  mySignal = 0;                       //Reset this variable with every loop.
  for(int i=0; i<reps; i++){
    mySignal = mySignal + analogRead(A0);
  }
  mySignal = mySignal / reps;         //Take the average analog reading.
  Serial.println(mySignal);           //Print to the serial monitor / or plotter.

  if(mySignal>threshold){             //If mySignal is greater than the threshold, it will trigger the relay
    trigger = true;
  } else {
    trigger = false;
  }

  if(trigger==lastTrigger){
    //do nothing if the current trigger is the same as the last trigger.
  }else {
    digitalWrite(relay, trigger);    //The state of the relay will reflect that of the trigger value
    delay(200);                      //The 200ms delay is necessary for stability reasons, DO NOT DELETE
    lastTrigger=trigger;             //Keep track of the state of the current trigger.
  }
}