I wanted a really mobile setup to measure the RSSI for our installations of muenchen.freifunk.net. It should be easy to carry and easy to use.
As long it did not find a muenchen.freifunk.net node, it does display the number of surrounding Wifi nodes. When it did find one or more muenchen.freifunk.net nodes, it selects the one with the current highest RSSI and displays this via the NeoPixel ring. For the next 60 seconds, this node is fixed. If it is lost, the search starts from the beginning.
If you add a serial console all the found SSIDs and more information is available with 9600-8-n-1.