Typical customers have chosen ZigBee for its low power requirements, network scalability, and reliability.

Last month you got me started on building a direct sequence spread spectrum (DSSS) transceiver. You covered the transmitter discussion and promised to come back to explain the receiver and error-correction code.

The Do-It-Yourself DSSS Transceiver

Sending Signals Underwater

Understanding Radios

Are all RFID systems able to work in the same frequency range?

From what I've read, wireless sensors and other wireless devices work at ISM frequency bands of 900 MHz and 2.4 GHz. But I've read, too, about "ISM-compliant" RFID tags and readers that work at 134 kHz.

What is the difference between the licensed and unlicensed bands and why should I care?

Receiver Sensitivity and Signal Levels

Some people say WiFi and ZigBee can work side by side; others say they cannot.