Read internal temperature of ESP32

esp32-internal-temp.ino

#include <Arduino.h>
#include "esp_system.h"

extern "C" {
uint8_t temprature_sens_read();
}

void setup() {
  Serial.begin(115200);
}

void loop() {
  //get internal temp of ESP32
  uint8_t temp_farenheit= temprature_sens_read();
  //convert farenheit to celcius
  double temp = ( temp_farenheit - 32 ) / 1.8;
  
  System.print("internal temp [°C]: ");
  System.println(temp);
  
  delay(500);
}