This is a WiFi scanner, created using the ESP8266 microcontroller and OLED display. ESP8266 is on the NodeMCU board, and the OLED display is of the SPI type. In periodic intervals, it scans the surrounding access points to WiFi and displays them on the display.
Source code
Article
http://www.arduinoslovakia.eu/blog/2017/7/esp8266-wifi-skener?lang=en
