LCD displaying 'b on printout












0















I've created this code to take a reading from a serial device on ttyUSB0 and then print it on an LCD display I have hooked up to my pi. I have it working to an extent but on my LCD display it is printing the byte symbol "b" followed by my reading. Is their a way to ignore the "b"?



My code:



import time

import serial

import I2C_LCD_driver





mylcd = I2C_LCD_driver.lcd()



print ("Starting Program")

ser = serial.Serial("/dev/ttyUSB0", baudrate=9600,

                    parity=serial.PARITY_NONE,

                    stopbits=serial.STOPBITS_ONE,

                    bytesize=serial.EIGHTBITS

                    )

time.sleep(1)

try:

    ser.write("12345".encode('utf-8'))

    print ("data echo mode enabled")

    while True:

        if ser.inWaiting() > 0:

            data = ser.read(size=7)

            print ("Weight", data, "kg")

            mylcd.lcd_display_string("Weight" + str(data), 1)





except KeyboardInterrupt:

    print ("Exiting Program")



except:

    print ("Error Occurs, Exiting Program")



finally:

    ser.close()

    pass





python byte







share|improve this question





























    0















    I've created this code to take a reading from a serial device on ttyUSB0 and then print it on an LCD display I have hooked up to my pi. I have it working to an extent but on my LCD display it is printing the byte symbol "b" followed by my reading. Is their a way to ignore the "b"?



    My code:



    import time
    
import serial
    
import I2C_LCD_driver
    

    

    
mylcd = I2C_LCD_driver.lcd()
    

    
print ("Starting Program")
    
ser = serial.Serial("/dev/ttyUSB0", baudrate=9600,
    
                    parity=serial.PARITY_NONE,
    
                    stopbits=serial.STOPBITS_ONE,
    
                    bytesize=serial.EIGHTBITS
    
                    )
    
time.sleep(1)
    
try:
    
    ser.write("12345".encode('utf-8'))
    
    print ("data echo mode enabled")
    
    while True:
    
        if ser.inWaiting() > 0:
    
            data = ser.read(size=7)
    
            print ("Weight", data, "kg")
    
            mylcd.lcd_display_string("Weight" + str(data), 1)
    

    

    
except KeyboardInterrupt:
    
    print ("Exiting Program")
    

    
except:
    
    print ("Error Occurs, Exiting Program")
    

    
finally:
    
    ser.close()
    
    pass





    python byte







    share|improve this question



























      0












      0








      0








      I've created this code to take a reading from a serial device on ttyUSB0 and then print it on an LCD display I have hooked up to my pi. I have it working to an extent but on my LCD display it is printing the byte symbol "b" followed by my reading. Is their a way to ignore the "b"?



      My code:



      import time
      
import serial
      
import I2C_LCD_driver
      

      

      
mylcd = I2C_LCD_driver.lcd()
      

      
print ("Starting Program")
      
ser = serial.Serial("/dev/ttyUSB0", baudrate=9600,
      
                    parity=serial.PARITY_NONE,
      
                    stopbits=serial.STOPBITS_ONE,
      
                    bytesize=serial.EIGHTBITS
      
                    )
      
time.sleep(1)
      
try:
      
    ser.write("12345".encode('utf-8'))
      
    print ("data echo mode enabled")
      
    while True:
      
        if ser.inWaiting() > 0:
      
            data = ser.read(size=7)
      
            print ("Weight", data, "kg")
      
            mylcd.lcd_display_string("Weight" + str(data), 1)
      

      

      
except KeyboardInterrupt:
      
    print ("Exiting Program")
      

      
except:
      
    print ("Error Occurs, Exiting Program")
      

      
finally:
      
    ser.close()
      
    pass





      python byte







      share|improve this question
















      I've created this code to take a reading from a serial device on ttyUSB0 and then print it on an LCD display I have hooked up to my pi. I have it working to an extent but on my LCD display it is printing the byte symbol "b" followed by my reading. Is their a way to ignore the "b"?



      My code:



      import time
      
import serial
      
import I2C_LCD_driver
      

      

      
mylcd = I2C_LCD_driver.lcd()
      

      
print ("Starting Program")
      
ser = serial.Serial("/dev/ttyUSB0", baudrate=9600,
      
                    parity=serial.PARITY_NONE,
      
                    stopbits=serial.STOPBITS_ONE,
      
                    bytesize=serial.EIGHTBITS
      
                    )
      
time.sleep(1)
      
try:
      
    ser.write("12345".encode('utf-8'))
      
    print ("data echo mode enabled")
      
    while True:
      
        if ser.inWaiting() > 0:
      
            data = ser.read(size=7)
      
            print ("Weight", data, "kg")
      
            mylcd.lcd_display_string("Weight" + str(data), 1)
      

      

      
except KeyboardInterrupt:
      
    print ("Exiting Program")
      

      
except:
      
    print ("Error Occurs, Exiting Program")
      

      
finally:
      
    ser.close()
      
    pass





      python byte




      python byte






      share|improve this question















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      edited Nov 26 '18 at 1:32









      Pang

      6,9391664102




      6,9391664102










      asked Nov 20 '18 at 15:06









      BradleyBradley

      247




      247
























          1 Answer
          1






          active

          oldest

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          1














          Calling str on a bytes object will return a string that contains quote marks and a b prefix, ex:



          >>> foo = b"hello"
          
>>> str(foo)
          
"b'hello'"


          Instead, try using decode:



          >>> foo.decode()
          
'hello'


          So for your code, that would be mylcd.lcd_display_string("Weight" + data.decode(), 1)






          share|improve this answer
























          • Perfect, it works. Very useful to know.

            – Bradley
            Nov 20 '18 at 15:20











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          1 Answer
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          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          1














          Calling str on a bytes object will return a string that contains quote marks and a b prefix, ex:



          >>> foo = b"hello"
          
>>> str(foo)
          
"b'hello'"


          Instead, try using decode:



          >>> foo.decode()
          
'hello'


          So for your code, that would be mylcd.lcd_display_string("Weight" + data.decode(), 1)






          share|improve this answer
























          • Perfect, it works. Very useful to know.

            – Bradley
            Nov 20 '18 at 15:20
















          1














          Calling str on a bytes object will return a string that contains quote marks and a b prefix, ex:



          >>> foo = b"hello"
          
>>> str(foo)
          
"b'hello'"


          Instead, try using decode:



          >>> foo.decode()
          
'hello'


          So for your code, that would be mylcd.lcd_display_string("Weight" + data.decode(), 1)






          share|improve this answer
























          • Perfect, it works. Very useful to know.

            – Bradley
            Nov 20 '18 at 15:20














          1












          1








          1







          Calling str on a bytes object will return a string that contains quote marks and a b prefix, ex:



          >>> foo = b"hello"
          
>>> str(foo)
          
"b'hello'"


          Instead, try using decode:



          >>> foo.decode()
          
'hello'


          So for your code, that would be mylcd.lcd_display_string("Weight" + data.decode(), 1)






          share|improve this answer













          Calling str on a bytes object will return a string that contains quote marks and a b prefix, ex:



          >>> foo = b"hello"
          
>>> str(foo)
          
"b'hello'"


          Instead, try using decode:



          >>> foo.decode()
          
'hello'


          So for your code, that would be mylcd.lcd_display_string("Weight" + data.decode(), 1)







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 20 '18 at 15:15









          KevinKevin

          58.9k1169113




          58.9k1169113













          • Perfect, it works. Very useful to know.

            – Bradley
            Nov 20 '18 at 15:20



















          • Perfect, it works. Very useful to know.

            – Bradley
            Nov 20 '18 at 15:20

















          Perfect, it works. Very useful to know.

          – Bradley
          Nov 20 '18 at 15:20





          Perfect, it works. Very useful to know.

          – Bradley
          Nov 20 '18 at 15:20




















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