SainSmart MEGA, ATmega2560 + SainSmart Sensor Shield V5 for Arduino UNO MEGA Duemilanove The SainSmart MEGA, ATmega2560 is a microcontroller board based on the ATmega2560. The SainSmart sensor shield can connect to various modules like sensors, servos, relays, buttons, potentiometers. Buy them TOGETHER and get at the REDUCE price. It is a big bargain!!!