Arduino I2C Scanner This article Is trick about serial connection on I2C-Bus in Arduino Board. Because of the time on develop software associated I2C device, the device may not respond. So i t can not be said that the problem is that the i2c device or develop a program. Advantages of I2C Scanner Find the Address of I2C Device. Check responds of I2C device. * If found I2C Device Address, It can used to program the Arduino board. * If not found I2C Device Address, Check the jumper cable (if jumper cable are Correct Device may be cracked .) Example Program Examples Circuit use Real Time Clock (DS1307) and 16x2 LCD I2C i2c scanner Program Referent - https://playground.arduino.cc/Main/I2cScanner