I2C and tone

Using Arduino Networking, Protocols, and Devices
3

I tried Arduino Uno, Mega and Pro mini (chinese, all bought in banggood.com), with the same result.

I2C interface: Iic i2c twi sp serial interface port module 5v 1602 lcd adapter geekcreit for arduino - products that work with official arduino boards Sale - Banggood.com

LCD: http://www.banggood.com/es/Wholesale-1602-Character-LCD-Display-Module-Blue-Blacklight-New-p-25345.html

The library is the one that comes with arduino IDE