MLX90640 Qwiic IR Array

Sensors Imaging
1

I have purchased a MLX90640 Qwiic IR Array. I started it with ESP32. After one day successful operation it stopped working. Also purchased a Teensy 3.5 board. Unfortunetally no signal from the array from both boards. I’m using SparkFun libraries and it hanged in MLX90640_API.cpp when executing <<MLX90640_GetFrameData(MLX90640_address, mlx90640Frame)>>.

If it was not working I should think it is a software problem, connected with I2C interface. Please, suggest me what to do - a software or hardware problem ?

2

Hi Iko,

If you run the [Example Code, what prints in the serial monitor?](https://learn.sparkfun.com/tutorials/qwiic-ir-array-mlx90640-hookup-guide#example-code)

3

Thanks a lot for the answer.

It was working fine one day. After the Serial monitor it simply hangs. No information. I have reduced error checking and forced data print to Serial. The array data are zero or large number.

4

Interesting. If you run an [I2C Scan does the MLX90640 show up on the bus? Also, can you please take a few photos of your board(s) and the circuit you have them in and attach them to your reply? Especially any soldering you may have done.](Arduino Playground - I2cScanner)

5

I have run I2C scanner and it shows the correct address - 0x33. But sometimes the address can not be found. After resetting the MCU it starts. I’m attaching two pictures of the boards used, ESP32 and Teensy 3.5, also a .txt file with the data obtained first day with ESP32.

Regards

I.H.

2.JPG
2.JPG2448×3264 372 KB

1.jpg
1.jpg2448×3264 372 KB

MLX90640_data.txt (37.1 KB)

6

Hi again Iko,

Thanks for that information and taking those photos. If the issue is intermittent, that usually points to a connection problem. Try double-checking you have good connections to the MLX90640 and then re-test. I would recommend testing with the Teensy since that is what the code was originally written to work with.