A design of a simple home service robot system is introduced.It is consisted by a EasyARM2100 SCM as its controlling core

a DC motor with decelerating devices as the engine

a ordinary direct current servo motor as the clearing motor

both photoelectric and ultrasonic sensor

a power circuit and a LCD display circuit.The system uses the EasyARM2100 SCM as its central controller

and search for the position of the smart car by receiving the data from the GPIO

then takes in charge of the car’s working procedure and measurong its speed with optical encoder

it can measure distance with the URM37 ultrasonic sensor module

with the help of computing software it can also avoid hit on the other objects

clean the floor

work as alarm and so on.The experiment shows that system performance index satisfies to design requirements.