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Extra resources for Elektor Electronics (March 2007)
4 GHz WirelessUSB transceiver and ATmega168 AVR microcontroller. 44 For wireless sensor network applications ZigBee  is often the protocol of choice. The protocol is relatively complicated, and only members of the ZigBee Alliance are permitted to use it in commercial products. Cypress  offers a simpler alternative in its WirelessUSB technology . The devices are cheap and the radio protocol makes only moderate demands in terms of hardware and memory in the microcontroller. WirelessUSB supports wireless manyto-one links and is thus ideal for use in wireless sensor networks.
It is easy to add extra application-specific functions. 4 GHz ISM band. Each WirelessUSB radio network uses a selection from a total of 79 channels: even when multiple WirelessUSB devices are operating simultaneously the protocol will be able to find a free channel to use. Transmission uses a robust DSSS (direct sequence spread spectrum) modulation scheme . Even at a 10 % error rate the data can still be received correctly, and if there should be long-term interference the protocol provides for elektor electronics - 3/2007 USB in miniature able WirelessUSB radio module an automatic change of channel.
With regard to current consumption, the maximum current a device is allowed to draw before enumeration (see inset) is 100 mA. During the enumeration process, the device states how much current it wishes to draw from the USB port (up to a maximum of 500 mA). In this case, we need a minimum voltage of 5 V for the microcontroller. Although it would be possible to use a step-up Figure 2. The microcontroller also occupies the central position on the circuit board. As you can see, there is a wealth of I/O options.