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pythonserial-port
Anderson
Anderson

Reputation: 143

Weird Output Value: b'[value]\r\n' - Python Serial Read

I'm reading a value through Python from the serial port of a sensor of Arduino.

My code(Python):

arduino = serial.Serial(2, 9600, timeout=1)
print("Message from arduino: ") 
while True:
   msg = arduino.readline()
   print(msg)

I don't know why the output result is something like b'[sensor-value]\r\n'. So, I get something like b'758\r\n' b'534\r\n' b'845\r\n' etc (regarding to sensor change value).

How I convert this?

Upvotes: 6

Views: 35053

Answers (2)

Mikkel Roald-Arbøl
Mikkel Roald-Arbøl

Reputation: 189

Encountered a similar problem with a Raspberry Pi Pico where I needed to both decode and get rid of the extra characters. That can all be achieved with a one-liner. This relies on the pySerial package.

msg = ser.readline().decode('utf-8').rstrip()

For the above example, serial.Serial has been named arduino instead of ser, so the solution there would simply be:

msg = arduino.readline().decode('utf-8').rstrip()

Found the hint in this blog post.

Upvotes: 0

changhwan
changhwan

Reputation: 1112

You need to decode it.

print(msg.decode('utf-8'))

Please check Lexical Analysis on Python 3 documentation to see what string prefixes means

Upvotes: 11

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