Wifi 망 스캔하여 SSD1306 표시_WeMos D1 mini R2

#include "SSD1306.h"
#include "ESP8266WiFi.h"

SSD1306 display(0x3c, 5, 4);

void setup() {
Serial.begin(9600);
Serial.println();
Serial.println("SSD1306/WiFiScan");

display.init();
display.flipScreenVertically();
display.setTextAlignment(TEXT_ALIGN_LEFT);
display.setFont(ArialMT_Plain_16);
display.drawString(0, 10, "SSD1306 &");
display.drawString(0, 28, "WiFiScan");
display.display();
display.setFont(ArialMT_Plain_10);
delay(2000);

WiFi.mode(WIFI_STA);
WiFi.disconnect();
delay(100);
}

void loop() {
display.clear();
display.drawString(0, 1, "scanning WiFi signals!");
int n = WiFi.scanNetworks();
delay(20);
display.drawString(0, 12, "scanning...");
display.display();
delay(400);

String postStr, noNw;
display.clear();
if(n==0) {
Serial.println("No WiFi networks found");
display.drawString(0, 2, "No WiFi networks found");
} else {
noNw = n; // 와이파이 네트워크의 개수
noNw += " networks are found!";
Serial.println(noNw);
display.drawString(0, 2, noNw);
for(int i=0; i postStr = i+1;
postStr += " : ";
postStr += WiFi.SSID(i);
postStr += " (";
postStr += WiFi.RSSI(i);
postStr += ")";
postStr += (WiFi.encryptionType(i) == ENC_TYPE_NONE)?" ":"*";
Serial.println(postStr);
display.drawString(0, i*10+12, postStr);
delay(10);
}
}
display.display();
Serial.println();
delay(3000);
}