This is sketch for internal temperature sensor ESP32 CPU. * The main ideas are: * to ignore 53.3 (128 before converting to Celsius); * WiFi must be connected, if else you'll get 53.3 (128) only. * * Tested in AI Thinker ESP32 Cam module. Can be add to standard camera example in Arduino. * While ESP32 Cam module was idle - the temperature was aro…

ESP32_selftemp_en.ino

/*This is sketch for internal temperature sensor ESP32 CPU. 
 * The main ideas are: 
 * to ignore 53.3 (128 before converting to Celsius);
 * WiFi must be connected, if else you'll get 53.3 (128) only.
 * 
 * Tested in AI Thinker ESP32 Cam module. Can be add to standard camera example in Arduino.
 * While ESP32 Cam module was idle - the temperature was around 47*C. 
 * While camera video stream was on - the temperature was rising to around 57*C.  
 * See temperature values in serial monitor at 115200.
 * Best regards, Anton S
*/

#include <WiFi.h>

// Replace with your network credentials
const char* ssid = "your SSID";
const char* password = "your pass";

//Intermal temperature sensor function declaration
#ifdef __cplusplus
extern "C" {
#endif
uint8_t temprature_sens_read();
#ifdef __cplusplus
}
#endif
uint8_t temprature_sens_read();                           //declare intermal temperature sensor function


uint32_t n;                                               //number of measurement
uint32_t timer;                                           //time from start
uint32_t tm1;                                             //start moment
  


void setup() {

  Serial.begin(115200);
  //Standart Wi-Fi connection
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");

  Serial.println(WiFi.localIP());
  
  //Table headers in serial monitor number, time(minutes), temperature Celsius
  Serial.print("Number\t");
  Serial.print("time\t");
  Serial.print("temp,C*\n");

  int n = 0;                                                    //set measurement number to 0 at setup
  tm1 = millis();                                               //set start moment to millis at setup

}

void loop() {

  // do something your's, for example increment c-variable
  uint8_t c;
  c++;


  // read internal sensor and print to Serial
  if ((temprature_sens_read()) != 128) {                       //ignore 128 (53.33 C) measurement

    n++;                                                       //number increment
    Serial.print(n); Serial.print("\t");                       //print number and tab


    timer = millis() - tm1;                                    //get meassurement moment

    Serial.print(timer / 60000.0); Serial.print("\t");         //print measurement time (minutes) and tab

    Serial.print((temprature_sens_read() - 32) / 1.8);         //print Celsius temperature and tab
    Serial.print("\n");                                        //print new line


    delay(1000);                                               //read temperature 1 times per sec                                             
    
  }

  delay(1000);                                                 //delay in loop 
}