Making the accelerometers wireless would allow for remote sensing of object orientation, which could be applied to virtual reality or possibly augmented cognition.
Having a 2.4GHz Serial Link is helpful, but what kind of applications could it be utilized for? Well, I had a number of 1-axis accelerometers from Freescale (graciously provided by their samples department for my electronics lab projects), which I could use detect object orientation.
To sense the position of the board, I used 3 single axis accelerometers in an X-Y-Z configuration. I used two MMA2260D Low-G X-axis accelerometers and one MMA1260D Low-G Z-axis accelerometer. The two X-axis accelerometers were positioned in an X-Y configuration and the Z-axis accelerometer was used to sense gravity in the Z-direction. The resistors below the accelerometers are used as a voltage divider so that the PIC, which is running at 3V, can read the voltage, which will vary from 0V to 2.5V. With this configuration, for each accelerometer 1.85V is +1G, 1.25V is 0G, and 0.65V is -1G.
The Laipac TRW-24G 2.4GHz transceiver uses a Nordic Semiconductor nRF2401a transceiver chip and includes all of the necessary components. The TRW-24G (also called the RF-24G and TXRX24G) requires a 3 Volt power supply and 3 Volt logic, so running the transceiver at 5 volts is not a viable option.
Authored by
Steven Cholewiak at
Semifluid, Added: Jan 7, 2007
http://www.semifluid.com/PIC18LF2550_wireless_3axis.html
