How to convert ASCII characterers to Strings in Python

Question

I am trying to compare an ASCII character that I am receiving from the serial port with a string. I am not able to do that, even though it seems like I have converted the inputs successfully. Here is my code

import serial
import time 
port="/dev/ttyUSB0"
serialArduino= serial.Serial(port,9600)
serialArduino.flushInput()
inputs=""
while True:
    inputsp=serialArduion.readline()
    for letter in inputsp:
        inputs=inputs+ str(letter)
   print inputs
   if inputs=="DOWN":
       print "APPLES"
   elif inputs=="UP"
       print "Bannana"

ok so even though the input sometimes equals UP OR DOWN it still does not print out APPLES or Bannana

falsetru · Accepted Answer · 2013-07-19 13:10:21Z

2

The return value of readline() contains newline. You need to strip newline.

import serial
import time 
port="/dev/ttyUSB0"
serialArduino= serial.Serial(port,9600)
serialArduino.flushInput()

while True:
    inputs = serialArduion.readline().rstrip()
    if inputs == "DOWN":
        print "APPLES"
    elif inputs == "UP"
        print "Bannana"

answered Jul 19, 2013 at 13:10

falsetru

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rajpy · Accepted Answer · 2013-07-19 13:06:56Z

0

try this:

while True:
    inputsp=serialArduion.readline()
    for letter in inputsp:
        inputs=inputs+ chr(letter)
   print inputs
   if inputs.lower() =="down":
       print "APPLES"
   elif inputs.lower() =="up":
       print "Bannana"

Just changed 'str' to 'chr', which converts ASCII to a character. Other than this modification, strip off any other characters coming from input stream.

answered Jul 19, 2013 at 13:06

rajpy

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