ESP32-S2 I2C interface with MLX90614

[vigneshtg]

Hello,
I'm using ESP32-S2 (ESP32-S2-Saola-1 Board, having ESP32-S2 Wroover model). I'm trying to connect ESP32-S2 with MLX90614 via I2C interface and have connected SDA to PIN8 and SCL to PIN9 of ESP32-S2. But the problem is nothing is displaying on Serial Monitor. Also, I've checked with I2C Scanner code and it's fine and showing I2C address that I setup, but the temperature is not showing on Serial Monitor and it is blank.

May I know the reason and please help me out.

Thank you.

[chegewara]

Maybe some code to show?

[vigneshtg]

I'm using the following library from Sparkfun for MLX90614
https://github.com/sparkfun/SparkFun_MLX90614_Arduino_Library

It also includes example code (MLX90614_Serial_Demo)

[chegewara]

Are you having issue with example or your own code?

[vigneshtg]

I'm using example code only and having issue with example code. It is successfully compiled and uploaded but nothing is showing on Serial Monitor.

[chegewara]

Try to comment out this line:
https://github.com/sparkfun/SparkFun_MLX90614_Arduino_Library/blob/master/src/SparkFunMLX90614.cpp#L35
or call Wire.begin(SDA, SCL) after therm.begin(); .
I think that therm.begin(); is reinit wire with default pins.

[vigneshtg]

Let me try it and update you. Thanks!

[vigneshtg]

I've checked by commenting this line:
https://github.com/sparkfun/SparkFun_MLX90614_Arduino_Library/blob/master/src/SparkFunMLX90614.cpp#L35
Also, called Wire.begin(SDA, SCL) after therm.begin();
But nothing is dsiplayed on Serial Monitor. Further, I've checked other I2C based sensor with ESP32-S2, there also nothing is displayed, but everything working fine with ESP32 but not with ESP32-S2. I think the problem is with I2C driver of ESP32-S2
Please help me out!
Thank you

[chegewara]

Time to use logic analyzer?

[vigneshtg]

Time to use logic analyzer?

However, I2C pins that I've used on ESP32-S2 is SDA - PIN8 and SCL - PIN9. Is that fine or is there any default I2C pins on ESP32-S2?

[chegewara]

https://github.com/espressif/arduino-esp32/blob/esp32s2/variants/esp32s2/pins_arduino.h#L17-L18

[vigneshtg]

https://github.com/espressif/arduino-esp32/blob/esp32s2/variants/esp32s2/pins_arduino.h#L17-L18

Yes, when I've started the connection, I followed this only, but still I don't understand why nothing is displayed on Serial Monitor and it's blank?

[chegewara]

I dont have that sensor, so no much help about it, but just tested I2C with DS1307 RTC and it is working just fine.

[vigneshtg]

I dont have that sensor, so no much help about it, but just tested I2C with DS1307 RTC and it is working just fine.

Have you interfaced DS1307 RTC with ESP32-S2 or ESP32? If you've done with ESP32-S2, could you please share the code so that it'll be helpful to check it. Also I can check with DS1307 RTC from my side and try to fix it with MLX90614

[chegewara]

Have you interfaced DS1307 RTC with ESP32-S2 or ESP32?

ESP32-S2 of course.

i am using example from RTClib library:

// Date and time functions using a DS1307 RTC connected via I2C and Wire lib
#include "RTClib.h"
#include "Wire.h"
RTC_DS1307 rtc;

char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

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

#ifndef ESP8266
  while (!Serial); // wait for serial port to connect. Needed for native USB
#endif
// Wire.begin(8,9);
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort();
  }

  if (! rtc.isrunning()) {
    Serial.println("RTC is NOT running, let's set the time!");
    // When time needs to be set on a new device, or after a power loss, the
    // following line sets the RTC to the date & time this sketch was compiled
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    // This line sets the RTC with an explicit date & time, for example to set
    // January 21, 2014 at 3am you would call:
    // rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
  }

  // When time needs to be re-set on a previously configured device, the
  // following line sets the RTC to the date & time this sketch was compiled
  // rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  // This line sets the RTC with an explicit date & time, for example to set
  // January 21, 2014 at 3am you would call:
  // rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
}

void loop () {
    DateTime now = rtc.now();

    Serial.print(now.year(), DEC);
    Serial.print('/');
    Serial.print(now.month(), DEC);
    Serial.print('/');
    Serial.print(now.day(), DEC);
    Serial.print(" (");
    Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
    Serial.print(") ");
    Serial.print(now.hour(), DEC);
    Serial.print(':');
    Serial.print(now.minute(), DEC);
    Serial.print(':');
    Serial.print(now.second(), DEC);
    Serial.println();

    Serial.print(" since midnight 1/1/1970 = ");
    Serial.print(now.unixtime());
    Serial.print("s = ");
    Serial.print(now.unixtime() / 86400L);
    Serial.println("d");

    // calculate a date which is 7 days, 12 hours, 30 minutes, and 6 seconds into the future
    DateTime future (now + TimeSpan(7,12,30,6));

    Serial.print(" now + 7d + 12h + 30m + 6s: ");
    Serial.print(future.year(), DEC);
    Serial.print('/');
    Serial.print(future.month(), DEC);
    Serial.print('/');
    Serial.print(future.day(), DEC);
    Serial.print(' ');
    Serial.print(future.hour(), DEC);
    Serial.print(':');
    Serial.print(future.minute(), DEC);
    Serial.print(':');
    Serial.print(future.second(), DEC);
    Serial.println();

    Serial.println();
    delay(3000);
}