In this paper, the hardware joints between infrared remote devices and single-chip computers and those between single-chip computers and electric motors are presented. Several common software decoding methods and their principle are given. First, the software decoding program is used to detect the waveform of the pulse emitted by the infrared remote device so as to obtain signal codes. Then, the rotation of the electric motor is controlled according to the obtained different signals. Thus, the evidences are provided for the software decoding.