1/19/2006 - The iDwaRF-168 module combines a Cypress WirelessUSB-LR CYWUSB6935 radio transceiver with an Atmel AVR ATmega168 microcontroller. Seperate transmit and receive antennas are already integrated into the PCB and an expansion connector provides a programming interface for the microcontroller and eight IO pins.
Cypress' CYWUSB6935 radio transceiver utilizes the worldwide unlicensed 2.4GHz ISM frequency band and uses a robust Direct Sequence Spread Spectrum (DSSS) transfer method with a data rate of 62.5kBit/s and a 50m range. The low standby power consumption of <1ľA is ideally suited for battery powered wireless sensor networks.
The ATmega168 microcontroller is freely programmable and provides 16kbytes flash, 1kbytes SRAM and 512 bytes EEPROM memory as well as powerful peripheral functions like UART, SPI and I2C interfaces, interrupt inputs, timer and PWM outputs and a 10 bit analog-to-digital converter with several inputs.
To support the simple setup of wireless multipoint-to-point (N:1) networks the royalty-free iDwaRF-Net firmware is available for download. The protocol aims at a reliable bidirectional communication between one hub and many sensors or actuators in N:1 networks and goes far beyond simple point-to-point (1:1) wireless solutions. The full protocol (e.g. error detection and correction, automatic channel selection, etc.) is encapsulated under convenient C-functions and can easily be extended by user-specific functions. The iDwaRF-168 module can be set up both as hub, as well as sensor or actuator module.
For evaluating the module and demonstrating simple applications, an iDwaRF-HubAdapter simplifies connecting the hub module to a PC, whereas the iDwaRF-SensorBox provides basic sensor functionality, like LED, push-button, potentiometer, temperature sensor and battery clip.
Further informations on the iDwaRF-168 module and the iDwaRF-Net firmware is available on online
Development and Distribution of Hard- and Software
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