The ZSTAR3 development tool contains one accelerometer transmitter board and one USB receiver node. A ZSTAR3 system can accommodate up to 16 accelerometer transmitter boards, connected through an RF ZigBee® 2.4 GHz communication to a single USB node connected to a PC. The accelerometer boards measured acceleration in three axes using either a digital or analog sensor. The sensor sensitivity is defined by the selected accelerometer. The USB node is part of the ZSTAR and ZSTAR2 design, reprogrammed with dedicated software supporting multiple nodes.