RioRand Sensor Shield V5 + Mega2560 + 4wd Mobile Platform Silver + Dual H Bridge Stepper Motor Driver + Hc-sr04, Ultrasonic Distance Sensor for Arduino UNO Mega R3 Mega2560 Duemilanove Nano Robot The RioRand Sensor Shield V5 (new version) has the COM and I2C (IIC) ports separated,so that both ports can be utilized at the same time to increase the possibilities of use. The RioRand MEGA 2560 Board for Arduino: This is a microcontroller board based on the ATmega2560. This RioRand 4WD Drive Aluminum Mobile Robot Platform for Robot Arduino UNO MEGA2560 R3 Duemilanove can hold many controllers, drivers, sensors and RF modules etc. RioRand Dual H Bridge Stepper Motor Driver RioRand HC-SR04, Ultrasonic Distance Sensor