LCD displaying 'b on printout

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

edited Nov 26 '18 at 1:32

Pang

6,9391664102

asked Nov 20 '18 at 15:06

Bradley

247

add a comment |

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

edited Nov 26 '18 at 1:32

Pang

6,9391664102

asked Nov 20 '18 at 15:06

Bradley

247

add a comment |

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

edited Nov 26 '18 at 1:32

Pang

6,9391664102

asked Nov 20 '18 at 15:06

Bradley

247

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

edited Nov 26 '18 at 1:32

Pang

6,9391664102

asked Nov 20 '18 at 15:06

Bradley

247

edited Nov 26 '18 at 1:32

Pang

6,9391664102

asked Nov 20 '18 at 15:06

Bradley

247

edited Nov 26 '18 at 1:32

Pang

6,9391664102

edited Nov 26 '18 at 1:32

Pang

6,9391664102

edited Nov 26 '18 at 1:32

Pang

6,9391664102

asked Nov 20 '18 at 15:06

Bradley

247

asked Nov 20 '18 at 15:06

Bradley

247

asked Nov 20 '18 at 15:06

Bradley

247

add a comment |

1 Answer
1

active

oldest

votes

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)

answered Nov 20 '18 at 15:15

Kevin

58.9k1169113

Perfect, it works. Very useful to know.

– Bradley
Nov 20 '18 at 15:20

add a comment |

Your Answer

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

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)

answered Nov 20 '18 at 15:15

Kevin

58.9k1169113

Perfect, it works. Very useful to know.

– Bradley
Nov 20 '18 at 15:20

add a comment |

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)

answered Nov 20 '18 at 15:15

Kevin

58.9k1169113

Perfect, it works. Very useful to know.

– Bradley
Nov 20 '18 at 15:20

add a comment |

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)

answered Nov 20 '18 at 15:15

Kevin

58.9k1169113

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)

answered Nov 20 '18 at 15:15

Kevin

58.9k1169113

answered Nov 20 '18 at 15:15

Kevin

58.9k1169113

answered Nov 20 '18 at 15:15

Kevin

58.9k1169113

answered Nov 20 '18 at 15:15

Kevin

58.9k1169113

Perfect, it works. Very useful to know.

– Bradley
Nov 20 '18 at 15:20

add a comment |

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

add a comment |

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