Light sensor
It can measure surroundings brightness using CdS. When it is connected to KRC and KRC is on, you can check light sensor input values on LCD panel using 'select' button. The sensor input can have values between 0~255, and it has 255 when no sensor is connected.

IR(Infrared) sensor
It can measure the distance to the obstacle or reflexibility of the obstacle in front of it. It does it by measuring the reflected infrared rays that the infrared LED emitted. Like the light sensor, you can check IR sensor input values by LCD panel using 'select's button. The sensor input can have values between 0~255, and it has 255 when no sensor is connected.

Touch sensor
ouch sensor has a push button on it. It reports if the push button is pressed. It only knows the time that the button is pressed, and you can make your program does necessary tasks if the button is pressed..

Sound(Clapping) sensor
Sound sensor has a electret microphone on it. It reports when a clapping is heard.It only knows the time when the clapping is heard, and you can make your program does necessary tasks if the clapping is heard.

LED
LED emits bright light. It can be used to show program states or to decorate robot visually..

Beeper
KRC has a beeper inside. It can be used to show program states or to decorate robot with sound.