Esp8266 Wifi Device Scanner

Esp8266 nodemcu wi fi scanner allows you to easily locate visible wireless networks and its corresponding information.

Esp8266 wifi device scanner.

Such a device can be used as a troubleshooting tool to determine if the suspect router is transmitting a wireless signal. This program obtains the network name ssid signal strength rssi and mac address security. This sketch demonstrates how to scan wifi networks. At the end of that i thought further improvements would be mainly tweaks and fine tuning but tobias wrote a comment explaining that it would be possible to avoid the initial network scan happening.

Last month i wrote a series of posts about reducing the power consumption of the esp8266 showing how i got the power consumption of a weather station down to 54 μah per 5 minute reporting cycle. This project is to create an open wifi scanner which will indicate visually by an led when there is an open wifi i e a wifi without password or wifi without authentication. The nodemcu is the easiest way to program and experiment with esp8266controllers. This instructable however can easily be done with any other module.

The code for this tutorial will be very simple and since we only want to scan and get some information about the surrounding wifi networks we will do all the coding on the setup function. In this instructable i will show you how you can easily make a wi fi network scanner with an esp8266. Esp8266 modules are great low cost stand alone controllers with built in wi fi. Wi fi scanner is useful for normal access point users who need to find out the signal strength distribution for their wireless network at home or choose a position for their access.

The api is almost the same as with the wifi shield library the most obvious difference being the different file you need to include. The objective of this post is to explain how to scan the surrounding wifi networks with the esp8266. The construction of the scanner is simple in design and only requires three main components. In the instructable i will use nodemcumodule version 0 9.

Include esp8266wifi h void setup serial. Scan to connect a mobile phone to a hot spot you typically open wi fi settings app list available networks and then pick the hot spot you need. To show how this kind of tracking works we can program a nodemcu in arduino to sniff the air for packets from any device we want to track turning on an led when it s detected nearby. Smartphones and other wi fi enabled devices send radio signals called probe frames to locate nearby wireless networks which makes them easy to track by listening for their unique mac address.

The esp8266 wi fi soc microcontroller an analog meter ammeter and an led.