I built a small firmware project for the M5Stick-C that continuously scans the 2.4 GHz Wi-Fi band , visualizes channel congestion as a histogram, and lets you drill into the strongest nearby networks (SSID, RSSI, channel). There’s also a lightweight tracking mode that estimates distance to a selected SSID using RSSI. Pocket-sized Wi-Fi visibility: quick scans and a clear spectrum view on the M5Stick-C. What it does Periodic active scans of nearby Wi-Fi networks across channels 1–13 . Histogram “spectrum” view showing how congested each channel is. Detail view listing the strongest networks with RSSI (dBm) and channel. Manual rescan on demand. Battery indicator with live percentage on screen. Tracking mode : lock onto an SSID and display RSSI + estimated distance. Spectrum view (channel congestion) The default screen is a simple histogram across channels 1–13. It gives an at-a-glance picture of where the band is crowded, so you can quickly s...