Modifying code example for ESP32 WiFi Scanner to display on OLED instead of Serial Monitor
Things used in this project
Hardware components
Software apps and online services
Story
The codes generated from this project is by modifying code of others (The reference link is attached below). It comes to my mind when I learn about how to use esp32. From the blog, the WiFi scanner data is displayed via Serial monitor. I am thinking "Hmm.. can I just try to display it on OLED, to make it cuter and cooler?" With some times of learning, eventually I have made it >w<
From the website I referred, it is using a 38 pins of ESP32 to realize the project. Instead, I am using a 30 pins of ESP32, so the GPIOs may be different. What I learnt from this project is that, you may refer to the datasheet to understand each pin functionality.
You may also try working with arduino Uno instead of esp32 by browsing through the net!
Schematics
Actual circuitry diagram of WiFi scanner and OLED.
ESP32 OLED
3V3 > VCC
GND > GND
D21 > SDA
D22 > SCA
Code
WiFi scanner coding
Arduino
#include "WiFi.h"
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
Adafruit_SSD1306 display(-1);
void setup()
{
// Set WiFi to station mode and disconnect from an AP if it was previously connected
WiFi.mode(WIFI_STA);
WiFi.disconnect();
delay(100);
// initialize with the I2C addr 0x3C
display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
// Clear the buffer.
display.clearDisplay();
display.setTextSize(2);
display.setTextColor(WHITE);
display.setCursor(0,28);
display.println(" WIFI SCAN");
display.display();
delay(2000);
}
void loop()
{
// WiFi.scanNetworks will return the number of networks found
//MatchState ms;
int n = WiFi.scanNetworks();
String ssid[n];
String rssi[n];
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
display.clearDisplay();
ssid[i] = WiFi.SSID(i);
rssi[i] = WiFi.RSSI(i);
}
}
for (int i = 0; i < n; ++i) {
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(0,14*i);
String ssid2 = ssid[i];
ssid2.replace("unifi", "u"); //I customize so that it the display format is in single line
display.println(ssid2+":"+ rssi[i]);
display.display();
delay(100);
}
}The article was first published in hackster, December 16, 2022
cr: https://www.hackster.io/edison0215/mini-wifi-scanner-using-oled-42a7a7
author: edison0215
