Degree character only works with serial monitor

Projects Programming
1

I have code that sends a degree sign as serial output but it show up as ?? under any windows program I use instead of the ° sign.

Serial.print("°F, ");

Gives me ??F,

2

do those support UTF8 ? it's sent as 0xc2b0

void setup() {
  Serial.begin(115200);
  char degree[] = "°";
  for (char* ptr = degree; *ptr != '\0'; ptr++) {
    Serial.print(*ptr, HEX); Serial.write(' ');
  }
}

void loop() {}

Serial Monitor (@ 115200 bauds) will show C2 B0

3

I checked the ° in the top post and it is indeed the UTF-8 character for degrees and it is indeed 0xC2B0.
Every program should support UTF-8, but perhaps something got lost halfway.

4

On my Windows computer at this time I have 3 different serial terminal applications:
Serial Monitor of Arduino IDE
Termite
TeraTerm

When I run this program on an Arduino UNO:

void setup() {
  Serial.begin(9600);
  Serial.println("START");
  Serial.println("Degree: °F");
}

void loop() {

}

I get the following results when I use...

Serial Monitor of Arduino IDE:

degree01_sermon_adrIde
degree01_sermon_adrIde728×448 7.22 KB

Termite:
degree02_termite

TeraTerm:
degree03_teraterm

So 2 out of these 3 serial terminal applications can display the degree sign as desired. (By the way: the degree sign is not within the standard ASCII range).
As already mentioned the application needs to support UTF8.

5

➜ Enable UTF-8 · Issue #582 · thestinger/termite · GitHub

2 Likes
6

With Termite (my non UTF-8 application) the degree sign will be displayed with code like this:

void setup() {
  Serial.begin(9600);
  Serial.println("START");
  Serial.print("Degree: ");
  Serial.write(176);    // the degree sign (for non UTF-8 apps)
  Serial.print("F");
  Serial.println();
}

void loop() {

}

Screenshot:
degree04_termite2

7

Must be missing something.
I did the Serial.write(176); and get at ? from the serial port.
Can't find how to make sure UTF-8 is enabled in my program.

8

What’s your program ?

9

I decided to put a ~ instead of the ° sign and change it in the program on my PC that reads the data. This works fine and is the only program I plan to use to get the data anyway.

10

What are you coding with on the PC side? It’s weird it does not support UTF8 or Unicode

11

I am using Visual Studio 10.
Maybe it as something with the data coming in from the serial port.
I use this with the degree sign and it works fine.
Tdata = ComData.Replace("~", "°")

12

Switch to Kelvin

13

Kelvin still has a degree symbol.

14

No it doesn't.

1 Like
15

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