/*  
	Simple Serial
	Language: Arduino/Wiring
	Listens for an incoming serial byte, adds one to the byte
	and sends the result back out serially.  Also blinks an LED
	on pin 13 every second.
*/

int LEDPin = 13;             // you can use any digital I/O pin you want
int inByte = 0;              // variable to hold incoming serial data
long blinkTimer = 0;         // keeps track of how long since the LED
							 // was last turned off
int blinkInterval = 1000;    // a full second from on to off to on again

void setup() {
	pinMode(LEDPin, OUTPUT);    // set pin 13 to be an output
	Serial.begin(9600);         // configure the serial port for 9600 bps
							// data rate.
}

void loop() {
	// if there are any incoming serial bytes available to read:
	if (Serial.available() > 0) {
		// then read the first available byte:
		inByte = Serial.read();
		// and add one to it, then send the result out:
		Serial.print(inByte+1, BYTE);
	}
	
	// Meanwhile, keep blinking the LED.
	// after a half of a second, turn the LED on:
	if (millis() - blinkTimer >= blinkInterval / 2) {
		digitalWrite(LEDPin, HIGH);      // turn the LED on pin 13 on
	}
	
	// after a half a second, turn the LED off and reset the timer:
	if (millis() - blinkTimer >= blinkInterval) {
		digitalWrite(LEDPin, LOW);        // turn the LED off
		blinkTimer = millis();            // reset the timer
	}
}

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