DrJarold

byte h = 0, m = 0, s = 0;
byte BUFFER = 255;
byte index = 0;
String inString;
bool isEndMessage = false;

void setup() {

	Serial.begin(9600);
	Serial.println("Write Hour!");
	while (!Serial.available())
		delay(1);

	h = atoi(GetData());
	Serial.println("Write Min!");
	while (!Serial.available())
		delay(1);

	m = atoi(GetData());
}
String GetData() {
	inString = "";
	isEndMessage = false;
	while (Serial.available()) {
		char ch = Serial.read();
		switch (ch) {
		case '\n':
		case '\r':
			isEndMessage = true;
			break;
		}
		if (!isEndMessage)
			inString += Serial.read();
		delay(1);
	}
	return inString;
}

byte atoi(String data) {
	byte result = 0;
	//дописываем логику
	return result;
}