MLX90614 with stm32f103 in arduino IDE Problem

mr.rohit30@ · Sep 7, 2020

Hello all,

i am using MLX90614 IR temperature Sensor with stm32f103 controller.
for programming i am using arduino ide.
when i interfaced IR sensor with arduino boards using adafruit library that time sensor works properly.

but when i tried with stm32 controller with same library that time sensor gives some 1037.33 something readings. MLX90614 sensors not work properly with stm32f controller in arduino ide in my case.

please suggest me any solution for my problem statement.

Thanks a bunch.

Harald Kapp · Sep 7, 2020

Check the assignment of the pins of the cpu board to the sensor. The STM likely uses different pins than the Arduino. You'll have to account for that in your code.

mr.rohit30@ · Sep 7, 2020

I checked stm32 I2C pin and i tried ADXL345 I2C interface sensor with stm32 on same pin. ADXL345 works in my case with same pins.so according to me the pin issue is not there

Harald Kapp · Sep 7, 2020

I2C requires pull-up resistors on SDA and (I think) SCL. Arduino has built-in pull-ups. I don't know about the STM. Maybe the ADXL345 has built-in pull-ups so it works on the STM, but the MLX90614 doesn't have pull-ups so it doesn't work?

Another possible issue: Arduino is a 5 V device.
STM is a 3.3 V device.
MLX90614 is available in 3.3 V and in 5V. As it works on the Arduino, I guess you have the 5 V variant. It will not work on the 3.3 V interface of the STM without an additional level shifter.

mr.rohit30@ · Sep 10, 2020

i checked datasheet of MLX90614 module, in that module they provide on board 4.7K Pull-up resistors on SDA and SCL line.
and according to its datasheet MLX90614 is compatible with 3.3V . my stm32F103 alsowork with 3.3V.
when i treid with arduino board i gave 3.3V to MLX90614 sensor from arduino board.

check link for a referance

https://www.14core.com/wiring-the-m...ture-measurement-sensor-with-microcontroller/

Harald Kapp · Sep 10, 2020

I assume you have set-up the arduino IDE correctly.
Any warnings or errors when compiling the code?
You may have to modify the wire.h library to accomodate the STM processor.

mr.rohit30@ · Sep 11, 2020

no warning or error during compiling the code .
i am checking wire.h library as well.

MLX90614 with stm32f103 in arduino IDE Problem

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