The buzzer sound can be used for Sound experiments. (can alarm, pronunciation, etc.)
*Bluetooth, wireless interface, voice module, voice recognition module, you can make wireless communication experiment.
*Servo interface, easy to drive the servo.
*Infrared detection interface to facilitate docking and infrared, to achieve human traffic statistics.
*DS18B20 temperature sensor interface, you can do temperature measurement experiment. (Not including DS18B20).
*LM35 temperature sensor interface, temperature measurement can be done experiment (not including LM35.
*Integrated infrared receiver, can fit any infrared remote control experiment (not including the integrated receiver).