Open WiFi Scanner using Esp8266 – EngineersGarage

This device looks for open WiFi networks. It is built using ESP8266.

1 Comment

  1. Tomi Engdahl says:

    Simple Scanner Finds the Best WiFi Signal

    Want to know which way to point your WiFi antenna to get the best signal? It’s a guessing game for most of us, but a quick build of a scanning WiFi antenna using mostly off-the-shelf components could point you in the right direction.

    With saturation WiFi coverage in most places these days, optimizing your signal might seem like a pointless exercise. And indeed it seems [shawnhymel] built this more for fun than for practical reasons. Still, we can see applications where a scanning Yagi-Uda antenna would come in handy. The build started with a “WiFi divining rod” [shawnhymel] created from a simple homebrew Yagi-Uda and an ESP8266 to display the received signal strength indication (RSSI) from a specific access point. Tired of manually moving the popsicle stick and paperclip antenna, he built a two-axis scanner to swing the antenna through a complete hemisphere.

    IoTuesday: Maximize Your WiFi With This One Weird Trick!
    Your IT department hates this.

    The execution was straightforward: mount the antenna and ESP8266 Thing Dev Board onto a pan/tilt bracket with some servos. The ESP8266 code was updated to connect to a WiFi access point (AP) and begin sweeping up and down (about 70°) and left to right (about 180°). At 5° increments, the ESP8266 would take an RSSI reading and remember the yaw and pitch settings of the highest RSSI. After sweeping, the antenna automatically returns to the position with the best RSSI.


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