Project Video
Project Details
This code is to use ESP8266, NodeMCU, Wemos D1 Mini to diplay all available access points (WiFi ) on serial monitor.
In this page I have provided 3 different Arduiono codes:
1-Basic WiFi scan
2-Display Open WiFo only
3-Advanced WiFi scan
See Using ESP8266 WiFi Scan to Open WiFi scan code with Arduino -Example 2
See Using ESP8266 Advanced WiFi scan code with Arduino -Example 3
Project Code
/*
* WiRi Signal strenght in Percentage (RSSI) calculation
* works with any ESP8266 MCU such as Di Mini, D1 Mini Pro, D1, NodeMCU or any other ESP8166 MCU
* and display on Serial Monitor
*
* Written by Ahmad Shamshiri
* on Aug 10, 2019 at 18:08 in Ajax, Ontario, Canada
watch video instruction for this code: https://youtu.be/EbqIB9vJbsQ
Get this code and other Arduino codes from Robojax.com
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*
* This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.*
* This code has been download from Robojax.com
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see .
*/
#include "ESP8266WiFi.h"
const int RSSI_MAX =-50;// define maximum strength of signal in dBm
const int RSSI_MIN =-100;// define minimum strength of signal in dBm
const int displayEnc=1;// set to 1 to display Encryption or 0 not to display
void setup() {
Serial.begin(115200);
Serial.println("Robojax Wifi Signal Scan");
// Set WiFi to station mode and disconnect from an AP if it was previously connected
WiFi.mode(WIFI_STA);
WiFi.disconnect();
delay(2000);
Serial.println("Setup done");
}
void loop() {
Serial.println("Wifi scan started");
// WiFi.scanNetworks will return the number of networks found
int n = WiFi.scanNetworks();
Serial.println("Wifi scan ended");
if (n == 0) {
Serial.println("no networks found");
} else {
Serial.print(n);
Serial.println(" networks found");
for (int i = 0; i < n; ++i) {
// Print SSID and RSSI for each network found
Serial.print(i + 1);
Serial.print(") ");
Serial.print(WiFi.SSID(i));// SSID
Serial.print(WiFi.RSSI(i));//Signal strength in dBm
Serial.print("dBm (");
Serial.print(dBmtoPercentage(WiFi.RSSI(i)));//Signal strength in %
Serial.print("% )");
if(WiFi.encryptionType(i) == ENC_TYPE_NONE)
{
Serial.println(" <<***OPEN***>>");
}else{
Serial.println();
}
delay(10);
}
}
Serial.println("");
// Wait a bit before scanning again
delay(5000);
WiFi.scanDelete();
}// loop
/*
* Written by Ahmad Shamshiri
* with lots of research, this sources was used:
* https://support.randomsolutions.nl/827069-Best-dBm-Values-for-Wifi
* This is approximate percentage calculation of RSSI
* WiFi Signal Strength Calculation
* Written Aug 08, 2019 at 21:45 in Ajax, Ontario, Canada
*/
int dBmtoPercentage(int dBm)
{
int quality;
if(dBm <= RSSI_MIN)
{
quality = 0;
}
else if(dBm >= RSSI_MAX)
{
quality = 100;
}
else
{
quality = 2 * (dBm + 100);
}
return quality;
}//dBmtoPercentage