Sending one digit variable serially

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Leon Ellis
Leon Ellis 2021-10-9
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!

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回答（1 个）

Atithi
Atithi 2023-6-22
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));
  1. 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.
  2. It converts the input into an unsigned 8-bit integer, where each bit in the binary representation represents a power of two.

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