This paper introduces a sensor platform system with TWE-LITE and some case studies of it for interactive media art workshop and live computer music performance. The system based on TWE-LITE microprocessor chip. TWE-LITE is a small device with wireless communication, low power (driven by button type cell battery). We describe about hardware and software of the sensor platform system. Next we describe about usage examples of our system for media art work and live performance. Through workshops and live performances, our system was shown to be utilized sufficiently.