ESP32 internal temperature sensor not working

[nikisalli]

esp32 internal temperature sensor reading 128F (53.33C) continuously with both example codes i found:

https://github.com/pcbreflux/espressif/blob/master/esp32/arduino/sketchbook/ESP32_int_temp_sensor/ESP32_int_temp_sensor.ino

https://gist.github.com/xxlukas42/7e7e18604f61529b8398f7fcc5785251

my setup:
ESP32 Dev module
QIO
4MB flash
Pochi partition scheme
80Mhz flash speed
240Mhz WiFi/BT cpu speed
psram disabled

ide used: arduino ide 1.8.5 on windows 10

i already checked issue #625 and the solution there doesn't work
thanks in advance :)

[lbernstone]

That function was deprecated long ago, and the temperature sensor is no longer included in the technical manual (since 06/2018). I'd guess the fact that it always returns 128 indicates that it is obsolete.

[nikisalli]

Hi, thank you for the fast answer. How can i read the internal temperature sensor then? Isn't there a register method to read that data directly from the registers?

[lbernstone]

You cannot. That's what obsolete means 😄

[buitre-buitaker]

For me is working, just using this code:

#ifdef __cplusplus
extern "C" {
#endif
uint8_t temprature_sens_read();
#ifdef __cplusplus
}
#endif
uint8_t temprature_sens_read();

---

Serial.print("Temperature: ");

// Convert raw temperature in F to Celsius degrees
Serial.print((temprature_sens_read() - 32) / 1.8);
Serial.println(" C");

[asetyde]

On new revision of chip esp32 is no present , on old yes. Check old issues. It's not affidable

[buitre-buitaker]

Do you me hal sensor or library method? What is not present?

[asetyde]

hardware temperature sensor on chip

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[JZ-SmartThings]

Using Heltec Wifi Kit 32 and getting the same result as the OP. This is definitely an issue and it should be left open until resolved.

[atanisoft]

@JZ-SmartThings file an issue with esp-idf for it. There is no supported hardware/software backing the API being requested.

[lbernstone]

Should I start an auction for reclaimed v0 chips?

[asetyde]

it can not be resolved if there isn't hw !!! Close this

[nikisalli]

Ok so apparently the new version of the chip doesn't come with an internal temperature sensor anymore so I'm closing this issue.

[BetterAutomations]

This may be interesting to some of you. I'm testing a ESP32-WROVER-IE which contains a ESP32-D0WD-V3 and I'm not seeing 128. Seeing 126, and can consistently reduce it to 125 by blowing on it then back to 126 when I warm it with fingers. I think the temp sensor is still working even in later chip revisions.

[lbernstone]

Probably more interesting is that the S2, C3 and S3 have fully functional temperature sensors.

[gotsila]

If you flash Tasmota Webserver 9.5.0 on it. it always works. using the example code above. it shows 128 or 53.33°
so i guess the sensor is already there.
but how can we use it under arduino? i don't know how to looking in the tasmota code

[beachmiles]

I got the internal temp sensor working on esp32-s2 and esp32-c3 dev boards using the legacy temp sensor driver. Seems pretty spot on temps.

#include "driver/temp_sensor.h"    //legacy esp32 temp sensor driver. https://github.com/espressif/esp-idf/blob/master/components/driver/test_apps/legacy_rtc_temp_driver/main/test_rtc_temp_driver.c

void initTempSensor(){
    temp_sensor_config_t temp_sensor = TSENS_CONFIG_DEFAULT();
    temp_sensor.dac_offset = TSENS_DAC_L2;  //TSENS_DAC_L2 is default   L4(-40℃ ~ 20℃), L2(-10℃ ~ 80℃) L1(20℃ ~ 100℃) L0(50℃ ~ 125℃)
    temp_sensor_set_config(temp_sensor);
    temp_sensor_start();
}

//Run the initTempSensor() function once in setup function then get temps in main like this
float result = 0;
temp_sensor_read_celsius(&result); 

[Masoud1344]

I got the internal temp sensor working on esp32-s2 and esp32-c3 dev boards using the legacy temp sensor driver. Seems pretty spot on temps.

#include "driver/temp_sensor.h"    //legacy esp32 temp sensor driver. https://github.com/espressif/esp-idf/blob/master/components/driver/test_apps/legacy_rtc_temp_driver/main/test_rtc_temp_driver.c

void initTempSensor(){
    temp_sensor_config_t temp_sensor = TSENS_CONFIG_DEFAULT();
    temp_sensor.dac_offset = TSENS_DAC_L2;  //TSENS_DAC_L2 is default   L4(-40℃ ~ 20℃), L2(-10℃ ~ 80℃) L1(20℃ ~ 100℃) L0(50℃ ~ 125℃)
    temp_sensor_set_config(temp_sensor);
    temp_sensor_start();
}

//Run the initTempSensor() function once in setup function then get temps in main like this
float result = 0;
temp_sensor_read_celsius(&result); 

Realy does it work?

[adrianlzt]

C3 and S3 do have a temperature sensor.

The temperature sensor has a range of –40 °C to 125 °C. It is designed primarily to sense the temperature
changes inside the chip. The temperature value depends on factors like microcontroller clock frequency or I/O
load. Generally, the chip’s internal temperature is higher than the operating ambient temperature.

[lbernstone]

New variants all have temperature sensors. The early revs of the esp32 do as well. There is a temperatureRead function in arduino core, but it will give you bad readings if you run it on an unsupported chip.