The Arduino Kick Starter - Sender Module

// "The Arduino Kick Starter" Project
// For ICStation.com's 2015 DIY competition
// See it in action: https://www.youtube.com/watch?v=lrRGC9Ypedc
// Code for Sender Module
// by Ido Gendel, 2015
// Share and enjoy!

#include <VirtualWire.h>
#include <EEPROM.h>

#define MAX_DELAY_MS 5000
#define MIN_DELAY_MS 1000
#define MAX_WAIT_MS 1000
#define FEEDBACK_MS 1000

const int RSEED_ADDRESS = 345;

const byte sensorPin = 2;

volatile byte movementDetected;

// RGB controls
struct tLightRec {
  byte pin;
  byte state;
} light[3] {{12, 0}, {13, 0}, {11, 0}};

//-----------------------------------------------------------
void setLight(const byte index, const byte newState) {

  light[index].state = newState;
  digitalWrite(light[index].pin, light[index].state);

} // setLight

//-----------------------------------------------------------
void rotateLights(const byte cycles = 60) {

  // LEDs on strip are GRB...
  byte actualOrder[3] = {1, 0, 2};
  byte currentIndex = 0;

  for (int cycle = 0; cycle < cycles; cycle++) {

    setLight(actualOrder[currentIndex], 0);
    currentIndex = (currentIndex + 1) % 3;
    setLight(actualOrder[currentIndex], 1);
    delay(80);

  } // for

  // "Cleanup"
  setLight(actualOrder[currentIndex], 0);

} // rotateLights

//-----------------------------------------------------------
unsigned int getRSeed() {

  unsigned int r;
  r = EEPROM.read(RSEED_ADDRESS);
  r <<= 8;
  r += EEPROM.read(RSEED_ADDRESS + 1);
  return r;

} // getRSeed

//-----------------------------------------------------------
void setRSeed(unsigned int r) {

  EEPROM.write(RSEED_ADDRESS + 1, r & 255);
  EEPROM.write(RSEED_ADDRESS, r >> 8);

} // setRSeed

//-----------------------------------------------------------
void setup()
{

  unsigned int RSeed;

  for (byte i = 0; i < 3; i++) pinMode(light[i].pin, OUTPUT);

    // Initialise the IO and ISR
    vw_set_tx_pin(A1);
    vw_set_rx_pin(9); // Prevent rx from disturbing pin 11!
    vw_set_ptt_inverted(true); // Required for DR3100
    vw_setup(2000);  // Bits per sec

  // Prevent repeating random patterns after reset
  RSeed = getRSeed();
  randomSeed(RSeed);
  setRSeed(RSeed + 1);

  rotateLights();
  delay(5000);

  pinMode(sensorPin, INPUT_PULLUP);
  attachInterrupt(0, sensorISR, FALLING);

} // setup

//-----------------------------------------------------------
void sensorISR() {
  movementDetected = 1;
}

//-----------------------------------------------------------
void loop()
{
    char failMsg[] = "FA1L";
    char timeMsg[] = "0000";
    byte success = 0;

    unsigned long timerStart, timerStop;

    delay(MIN_DELAY_MS + random(MAX_DELAY_MS));
    setLight(1, 1); // Green ON
    timerStart = millis();

    movementDetected = 0;
    while (millis() - timerStart < MAX_WAIT_MS) {
       if (movementDetected) {

         timerStop = millis();
         success = 1;
          break;

       }  // if
    } // while

    setLight(1, 0); // Green OFF

    if (success) {
      setLight(2, 1); // Blue ON
      // Timing message
      sprintf(timeMsg, "%4d", timerStop - timerStart);
      vw_send((uint8_t *)timeMsg, strlen(timeMsg));
      vw_wait_tx(); // Wait until the whole message is gone

    } else {
        setLight(0, 1); // Red ON
        vw_send((uint8_t *)failMsg, strlen(failMsg));
        vw_wait_tx(); // Wait until the whole message is gone
      } // else

    delay(FEEDBACK_MS);
    for (byte i = 0; i < 3; i++) setLight(i, 0);

} // loop