const int led1=6;
const int led2=7;
const int led3=8;

float sourceOvervoltage = 54.00; //Source Overvoltage
const int analogInput1 = A0; // voltage measurement pin
int value1 = 0;
float vout1 = 0.0;
float vSource = 0.0;
float R1a =100000;
float pot1 = 10000;


#define INTERVAL_MESSAGE1 5000
#define INTERVAL_MESSAGE2 7000
#define INTERVAL_MESSAGE3 11000
#define INTERVAL_MESSAGE4 13000
 
unsigned long time_1 = 0;
unsigned long time_2 = 0;
unsigned long time_3 = 0;
unsigned long time_4 = 0;
 
void print_time(unsigned long time_millis);
 
void setup() {
    Serial.begin(9600);
    pinMode(led1, OUTPUT);
    pinMode(led2, OUTPUT);
    pinMode(led3, OUTPUT); 
}
 
void loop() {
    if(millis() >= time_1 + INTERVAL_MESSAGE1){
        time_1 +=INTERVAL_MESSAGE1;
        print_time(time_1);
        Serial.println("I'm message number one!");
    }
   
    if(millis() >= time_2 + INTERVAL_MESSAGE2){
        time_2 +=INTERVAL_MESSAGE2;
        print_time(time_2);
        Serial.println("Hello, I'm the second message.");
    }
   
    if(millis() >= time_3 + INTERVAL_MESSAGE3){
        time_3 +=INTERVAL_MESSAGE3;
        print_time(time_3);
        Serial.println("My name is Message the third.");
    }
   
    if(millis() >= time_4 + INTERVAL_MESSAGE4){
        time_4 += INTERVAL_MESSAGE4;
        print_time(time_4);
        Serial.println("Message four is in the house!");
    }
}
 
void print_time(unsigned long time_millis){
    Serial.print("Time: ");
    Serial.print(time_millis/1000);
    Serial.print("s - ");
}