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I have interfaced HB100 sensor with ATMega Microcontroller. It easily detects my hand movement upto 5-6 inches only. I want to extend range of the sensor so that it detect movement upto atleast 10meters. I see people use Dish antenna. For that it requires LNB, I have no knowledge of RF can someone please suggest how do I select LNB for HB100? Or any other way to extend the sensing range which can save me from LNB stuff? Thanks enter image description here

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    \$\begingroup\$ A 5-6 inch detection range would indicate something is wrong with your setup. Are you moving the target? Although sometimes misrepresented as a "distance sensor" (shockingly in places that should know better, like Mouser) this is a doppler sensor only able to detect motion. Also make sure it's not being distracted, eg any sort of fan can easily trigger these. That said you're probably not going to get 10 meters from something like this. \$\endgroup\$ Sep 21 '20 at 16:23
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    \$\begingroup\$ Thanks for your reply. i am not detecting distance, I am detecting speed but the problem is it detects movement from a few inches only. It does not responds to any movement happened beyond this distance. \$\endgroup\$
    – Sidk
    Sep 22 '20 at 1:19
  • \$\begingroup\$ Then there's something wrong with your particular unit or setup. You should get at least a few meters. \$\endgroup\$ Sep 22 '20 at 1:52
  • \$\begingroup\$ Any idea what can be wrong with my setup? \$\endgroup\$
    – Sidk
    Sep 22 '20 at 4:48
  • \$\begingroup\$ Maybe coupled noise, maybe a bad module \$\endgroup\$ Sep 22 '20 at 4:49
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Taking a look at a teardown of the HB100 module, it appears that the antenna is a pair of two-element patch arrays (one for TX, one for RX) on the back of the board. There's no coaxial out. It'll be very difficult to bodge it into a standard feed horn for a dish.

You might be able to install the module itself at the focus of an old VSAT dish, with the antenna face of the module pointed at the reflector. This isn't super ideal: the patches aren't designed to be a dish feed, so your aperture efficency will likely be pretty awful as you won't illuminate the whole dish and/or you'll have signficant spillover. But, it might work in a pinch.

Either way, keep in mind that you are increasing the EIRP of the module by doing this, and that you may run into regulatory issues if it's too high. I'd suggest learning more about RF and radar before attempting this.

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  • \$\begingroup\$ I have placed the sensor right in the center of the dish without any LNB etc. it still responds to really close motion only. \$\endgroup\$
    – Sidk
    Sep 22 '20 at 5:21

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