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The opening of this article is confusing. It contrasts relatively expensive Zigbee and Z-Wave devices with cheap sensors emitting radio signals in the unlicense
by timerol 4y ago
The opening of this article is confusing. It contrasts relatively expensive Zigbee and Z-Wave devices with cheap sensors emitting radio signals in the unlicensed ISM bands. But Zigbee and Z-Wave both operate in ISM bands, so the distinction isn't a difference.
It's more like the difference between building and hosting a static website with Squarespace vs. AWS. One of them is more expensive with more bells and whistles, but both accomplish similar goals by communicating with the browser in similar ways.
- Reventlov 4y agoyup, I guess what the author meant is the 433 MHz vs 868 MHz / 915 MHz and 2.4GHz ISM bands. In my experience, expensive stuff tends to run in the 2.4 GHz band, while inexpensive stuff runs in the 433 MHz band. I know that 868 MHz is not in the ISM bands, but in Europe, it's really close.
- timerol 4y agoZ-Wave uses a signal around 900 MHz. The differences in how countries regulate it leads to this fun map and table of exact frequencies: https://www.silabs.com/wireless/z-wave/global-regions https://www.silabs.com/wireless/z-wave/global-regions