Serial data issue

Asked Jul 27 '17 at 07:00

Active Jul 27 '17 at 07:00

Viewed 42 times

I want to make a program that receives data from the serial port so it can be looked for as an entry of a dictionary on Python 2.7.5 and Arduino 1.8. :

import serial #Import Serial Library
arduinoSerialData =serial.Serial('com3',9600)
y={"a":"hello","b":"How are you?"}
while (1==1):
    if(arduinoSerialData.inWaiting()>0):
        myData=str(arduinoSerialData.readline())
        print y.get(myData,"error")

I don't know what is happening, but the program always prints "error" However, if I try only printing the variable "myData" it does print exactly what Arduino is sending. Please, help.

asked Jul 27 '17 at 07:00

Agustin Jacob Ortiz Mendez

Does `myData` have a trailing newline in the string that you don't notice when printing it out? – Mike Robins Jul 27 '17 at 07:18
In the Arduino program, I send it with a Serial.println('a'); Is that a problem? – Agustin Jacob Ortiz Mendez Jul 27 '17 at 07:20
1

Well yes, the `get` will be comparing `'a\n'` against `'a'` and not matching hence your error. `myData.strip()` will remove leading and trailing whitespace. – Mike Robins Jul 27 '17 at 07:57
Thank you very much! It works. :D – Agustin Jacob Ortiz Mendez Jul 27 '17 at 18:24

Serial data issue

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