// risd_2_hello.ino

// simulator of digital clock

// use real world noise as random seed

// connect one end of a cable to A0, other end is loose

// programmed on wednesday february 09 2022

// by aaron montoya-moraga

// current time measured in milliseconds, seconds, minutes, hours

int currentMs = 0;

int currentSeconds = 0;

int currentMinutes = 0;

int currentHours = 0;

// increment

int incrementMs = 1000;

void setup() {

// open serial port

Serial.begin(9600);

// wait until serial port is open

while (!Serial) {

;

}

}

void loop() {

// update time in milliseconds

currentMs = currentMs + incrementMs;

// update seconds, minutes and hours

currentSeconds = currentMs / 1000;

currentMinutes = currentSeconds / 60;

currentHours = currentMinutes / 60;

// print time to console in format HH:MM:SS

// with zero padding to the left

checkPadding(currentHours);

Serial.print(currentHours);

Serial.print(":");

checkPadding(currentMinutes);

Serial.print(currentMinutes);

Serial.print(":");

checkPadding(currentSeconds);

Serial.print(currentSeconds);

Serial.println("");

// wait until next iteration

delay(incrementMs);

}

// function to add padding of zeros to the left

void checkPadding(int checkNumber) {

// if number is less than 10, print a 0

if (checkNumber less than 10) {

Serial.print("0");

}

}