Starting Lights by Juan Pardo

It is an Arduino based system. You will find below details for building the device provided by the Author.

//==============================================================================
// Program:      ZRound.ino
// Author:       Juan Pardo
// Target:       UNO R3, IDE 1.0.5 
// Date:         2013/08/12
// Time:         02:32
// Notes:        
//               Uses Serial I/O
// Reference:    
//==============================================================================
#define VERSION  0.7
 
//=====[ INCLUDE ]==============================================================

 
//=====[ CONSTANTS ]============================================================
#define CMD_START   "$START"
#define CMD_STOP    "$STOP"
#define ANS_GO      "$GO"
#define bSize       64 
#define L_OFF       HIGH
#define L_ON        LOW

//=====[ PINS ]=================================================================
int DebugLed = 13;
 
//=====[ VARIABLES ]============================================================
char Buffer[bSize];        // Serial buffer
char ShadowBuffer[bSize];  // Serial buffer
char Command[10];
byte LightPort[]={4,5,6,7,8,9}; // Last port will be used as green light
byte LIGHTS;
byte GREENLIGHT;

//=====[ ReadSerialCommand ]====================================================
int ReadSerialCommand(void) {
  int BytesCount = -1;
  BytesCount =  Serial.readBytesUntil('\n',Buffer,bSize-1);  
  if (BytesCount  > 0) {
    Buffer[BytesCount]='\0';
  }
  else{
    Buffer[0]='\0';
  } 
  return BytesCount;
}

//=====[ LightsOFF ]=============================================================
void LightsOFF(void) {
  for(int i=0;i<LIGHTS;i++){
    digitalWrite(LightPort[i], L_OFF);	//Switch off lights
  }  
}

//=====[ SETUP ]===============================================================
void setup() {
  LIGHTS = sizeof(LightPort);
  GREENLIGHT = LIGHTS-1;
  for(int i=0;i<LIGHTS;i++){
    pinMode(LightPort[i], OUTPUT );		//Setup lights ports
    digitalWrite(LightPort[i], L_OFF);	//Switch off lights
  }

  Serial.begin(9600); 
  // Switchoff lights
  LightsOFF(); 
}


//=====[ LOOP ]===============================================================
void loop() {
 
  if(ReadSerialCommand()>0){
   
    strcpy(ShadowBuffer,Buffer);        
    strcpy(Command,strtok(ShadowBuffer,","));        
    
    if(strcmp(Command, CMD_START)==0){
      LightsOFF();
      for(int i=0;i<LIGHTS-1;i++){
        digitalWrite(LightPort[i], L_ON);	//Switch on lights
        delay(1000);
      }
      // Send GO to PC
      Serial.print(ANS_GO);	  
      Serial.print('\n');
      Serial.flush();

      LightsOFF();
      digitalWrite(LightPort[GREENLIGHT], L_ON);	//Switch on Green light
    }
    else{
      if(strcmp(Command, CMD_STOP)==0){
        LightsOFF();
        // Red lights blinking during 1 minute
        for(int i=0;i<60;i++){
          for(int j=0;j<LIGHTS-1;j++){
            digitalWrite(LightPort[j], L_ON);
          }
          delay(500);
          for(int j=0;j<LIGHTS-1;j++){
            digitalWrite(LightPort[j], L_OFF);
          }	
          delay(500);	
        }
        LightsOFF();
      }
    }
  }    
}