1.Source-Code-Raspberry-Pi-Sending-Data-to-the-Arduino.ino

// Source Code: Raspberry Pi sending data to the Arduino

const int ledPin = 13;

void setup()
{
 pinMode(ledPin, OUTPUT);
 Serial.begin(9600);
}

void loop()
{
 if (Serial.available()) 
 {
 blink(Serial.read() - '0'); // convert the character '1'-'9' to decimal 1-9
 }
 delay(500);
}

void blink(int numberOfTimes)
{
 for (int i = 0; i < numberOfTimes; i++) 
 {
 digitalWrite(ledPin, HIGH);
 delay(100);
 digitalWrite(ledPin, LOW);
 delay(100);
 }
}