i2ic port scanner

#include 

void setup() {
Serial.begin (9600)
while (!Serial)

Serial.println ("=== Selamat Datang di indomaker ===")
Serial.println ("Mencari alamat I2C")
Serial.println ()
Serial.println ("I2C scanner. Proses Scan ...")
byte count = 0

Wire.begin()
for (byte i = 8 i < 120 i++)
{
Wire.beginTransmission (i)
if (Wire.endTransmission () == 0)
{
Serial.print ("Alamat I2C : ")
Serial.print (i, DEC)
Serial.print (" (0x")
Serial.print (i, HEX)
Serial.println (")")
count++
delay (1)
}
}
Serial.println ("Selesai.")
Serial.print (count, DEC)
Serial.println (" device(s).")
}

void loop() {}

sumber dan tutorial lengkap bisa dilihat di http://indomaker.com/product/blog/tutorial-mencari-alamat-i2c-pada-lcd/