Mlx90640 infrared thermal imaging sensor temperature measurement module development notes (I)

MLX90640 Infrared thermal imager temperature measurement module development notes （ One ） Overview and development data preparation

Now more and more people are making infrared imagers , Two years ago, there was a scientific research project on the operation status of underground electromechanical equipment , It was used AMG8833（8*8 Pixels ）, Scientific research is scientific research after all , Later, I didn't hear about the application of the results , I think so , 8*8 Can do , You can also make an infrared temperature measuring gun . Some time ago, because the company produced circuit board testing needs , I plan to buy an infrared imager to measure whether the heating of the circuit board is normal , Commercial prices are still a little expensive , Our circuit boards are not big, so we found a cheap one to use first , I found... By accident MLX90640 This thing , 32*24 Pixels , 768 A temperature measuring point , Basically, it can be used for imaging . Now all smartphones 、 Promotion of information technology 、 Artificial intelligence , Can you use MLX90640 Make an infrared module that can connect with the mobile phone for imaging , In that case, test 、 Storage is not very convenient . Do what you say , Act now .....

MLX90640 There are two models , A The type and B type , Each shot one , In the process of waiting for logistics, simply do some preparatory work first , Let's also talk about infrared imaging .

The first is to MLX Download several necessary files on our official website , There are only two files that are useful .

（1） MLX90640 Data manual

The download address is not easy to put , You can write private letters .

（2） MLX90640 Driver library and documentation

Download address

About the two files downloaded from the official website , The manual is very general , It's useless to say, and it's not as good as , But after reading it, I think most of it is meaningless and I don't know why I want to write , But it's impossible not to read the manual . At the same time, I also did Chinese Translation , MLX90640 Download address of Chinese Manual

Another downloaded file mlx90640-library-master.zip The problem is more serious （ It took me more than a day ）. I won't say much about the process , Just say what the problem is . There are... In this compressed package API Instructions 、 API Of C Language source code and a set of Excel Example of parameter calculation completed by file calculation , There is no problem with the original data and calculation results of the example , But I follow API Use the instructions in the instructions to call the functions in the function inventory , Use Excel In any case, the original data in get incorrect results , Later, I found that the problem lies in the download API function .

MLX90640_API.h A structure type is defined in the file , There are obvious mistakes ：

uint16_t alpha[768];

int8_t kta[768];

int8_t kv[768];

The above three variables are defined as integers , however , Excel In the calculation table , The values of these three arrays are displayed as 0.0000000397885742132、 0.00634766、 0.43750000 The appearance of , This is an integer ？ Don't say anything else , Excel and API It's not the same version or inconsistent 100% Of . After constantly looking for others to use API、 test , The following files are available , At the same time, I also made a API Chinese translation of instruction documents .

MLX90640 Driver library :

MLX90640API English description