There are really only two or three chipsets used inside mass market USB wireless adaptors. A USB wireless adaptor is also cheap and readily available, so there isn’t a lot of reasons not to add it unless you’re on a really tight budget. This second adaptor isn’t necessary for our network scanner, as we’ll be using the onboard WiFi adaptor for the most part, but it’ll give us a lot more flexibility later on if we want to do more in-depth monitoring of our network environment. We’re going to be adding a second USB WiFi dongle to our Raspberry Pi since the BCM43438 WiFi chipset on the Raspberry Pi 3 does not currently support monitoring mode. Optionally Adding a Second Wireless Adaptor However, don’t worry as it’s not anywhere near as hard as SMD soldering and there are several good guides to help you out. These boards use castellated mounting holes, which can be tricky to solder if you’re more used to through hole components. The only soldering needed for the project is attaching the controller boards to the seven-segment displays. It can also be put together with minimal soldering. Most of the hardware for this project is fairly easy to get a hold of and, apart from the giant seven-segment displays and the controller boards for them, you may well have most (or even all) of the bits and pieces you need kicking around your workshop already. ![]() So instead, our network scanner is going to be plenty visible. We’re more the glowing red 6-inch tall seven-segment display sort of people. ![]() If you did that, you’d end up with a Pi that could sit quietly in a corner and monitor your home or office wireless network, squirreling away information about what hosts are connecting to without anyone taking much notice of it at all. And as we’re going to make use of ARP scans to do it, which are moderately stealthy unless you heavily hammer the network, it would be easy to make something that is pretty much invisible to most people. ![]() We’re going to make use of a Raspberry Pi to build a network scanner to keep track of the hosts connecting to our local network.
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