A trivial Arduino application showing delaying an event synchronously for some number of minutes

minute_timer.ino

#define SECOND	1000 // 1 sec = 1000 millseconds
#define MINUTE	60 * SECOND // 60 sec = 1 minute

void setup() {
	Serial.begin(115200);
	randomSeed(analogRead(0)); // choose a pseudo-random starting seed
}

void loop() {
	WaitForNMinutes();
}

void WaitForNMinutes() {
	long minutes = random(1,60); // generate a value between 1 and 60, inclusive
	Serial.print("Waiting for "); Serial.print(minutes); Serial.println(" minutes");
	delay(minutes * MINUTE);
	Serial.println("Ok, done waiting!");
	Serial.println("-----");
}