Abnormal analysis of pcf8591 voltage measurement data

Problem description ： after ad After the transformation , Convert data into voltage value , And display the voltage value on the nixie tube . But the nixie tube can display 5.44.

Problem analysis ： In general , I think it's the error from integer to floating point , But when you think about it, it shouldn't exist in two decimal places .

Problem solving ： After a long time of thinking , I found that the data may have overflowed ：

// The data I define is unsigned char
// The biggest data received is 255
// Because the decimal number should be displayed on the nixie tube , So I enlarged the data 100 times , The data processing is as follows 


unsigned char dat_in;

smg_set(0,0,0,0,0,dat_in/51,(dat_in*100/51)%100/10,（dat_in*100)/51%10);


// It's not hard to find out , Most likely in （dat_in*100)/51 Overflow occurred in the process of 

So the solution is to change to unsigned int Slightly .

beautiful ！！！ Clean and hygienic oh ！！！！