#include <ThingSpeak.h>
#include <WiFi.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

Adafruit_SSD1306 display(128,64,&Wire,-1);

WiFiClient client;
char ssid[]="Wokwi-GUEST";
char password[]="";
unsigned const long channelid=2512152;
const char *apiKey="JQNU1FCKT47342WZ";
const int field=1;
int p=32;

void setup() {
  WiFi.begin(ssid,password);
  WiFi.mode(WIFI_STA);
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  ThingSpeak.begin(client);
  if(!display.begin(SSD1306_SWITCHCAPVCC,0x3c))
  {
    Serial.println("Error in oled initialisation");
  }
  else
  {
    Serial.println("OLED initialised");
  }
  display.display();
  delay(2000);
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(SSD1306_WHITE);
}

void loop() {
  int photo=analogRead(p);
  photo*=3;
  photo/=10;
  Serial.print("value:");
  Serial.println(photo);
  display.setCursor(0,0);
  display.print("Val:");
  display.print(photo);
  display.display();
  delay(2000);
  display.clearDisplay();
  ThingSpeak.writeField(channelid,field,photo,apiKey);
}