Sending one digit variable serially

Question

Leon Ellis 2021-10-9

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1470051-sending-one-digit-variable-serially

回答： Atithi 2023-6-22

Good day, I'm trying to send the variable x through serial to my arduino. The only problem is, when i monitor my serialport, the value of x doesn't appear as it should and I need it to. This is my very simplified code:

clear;

x=6;

x=x+3;

x;

s=serialport("COM1",9600);

pause(1);

write(s,x,"char");

In my serial monitor, it only creates a bunch of spaces and I've tried all the different types of variable types, i.e "uint", "int", "single" etc availeble. However, as you can see the varaible x should be 9 and I want to send 9. When I use single, I get values on the ASCII table, however subtracting the right amount to achieve the '9' doesn't seem to work. Any help would be much appreciated!

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Atithi 2023-6-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1470051-sending-one-digit-variable-serially#answer_1260369

在 MATLAB Online 中打开

There might be some error in write() function, it would be better if you send the values using "uint8" instead of using "char"

clear;
x=6;
x=x+3;
x;
s=serialport("COM1",9600);
pause(1);
write(s,uint8(x));

uint8 is a MATLAB function that maps an input number or array onto the range of 0 to 255 using only 8 bits of data.
It converts the input into an unsigned 8-bit integer, where each bit in the binary representation represents a power of two.