Arduino Serial.write() 丢失数据

Question

I'm reading data from Serial2 and writing data to Serial3 on Arduino like this:

Serial3.write(Serial2.read());

I am writing a concatenated string from Python that looks like this:

myNum = readADC(2)
myString = "The Number: " + str(myNum)
print(myString);

The output of the above code an empty string.

If I do print("some string " + myNum) I get:

some string

If I do print(myNum) I get:

say, 32

Printing myString to the Python console shows the expected output.

It looks like Serial.write(data) is doing something to the string.

How do I fix this?

Answer 1

Actually Serial.read() returns 1 byte of data. I am surprised you get "The Number" string.

I recommend you to

• Read incoming bytes with an iteration

char IncomingString[14];
if (Serial.available() > 0) {
    Serial.readBytes(IncomingString, 14);// Assuming myNum is 2 bytes data
}

From now on you have your string. You can use Serial.write(IncomingString)

• Send "The Number: " and myNum consequtively.

print("The Number: ");
print(str(myNum));