python read serial output from arduino

Question

I have an Arduino hooked up with 2 DS18B20 temp sensors. I'm very (VERY) new to python. I am looking for a way to read the serial input and parse it into a sqlite database, but that is getting ahead of myself. Why do I get an error while trying to define my serial port to a variable?

First things first sys.version

2.7.1 (r271:86832, Jul 31 2011, 19:30:53) 
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)]

My current, just read input from the serial connection program.

from serial import serial
import time


# open serial port
ser = serial.Serial('/dev/tty.usbmodem621',9600,timeout=2) 
ser.open()


while True:
    print('dev 0' + ser.read())     
    pass

ser.close()

I can not currently get it to compile. Most of the results I've found for this error tell to add from serial import serial, but in this case it hasn't worked.

The error.

$ python ser.py
Traceback (most recent call last):
  File "ser.py", line 1, in <module>
    from serial import serial
  File "/Users/frankwiebenga/serial.py", line 8, in <module>
AttributeError: 'module' object has no attribute 'Serial'

Also if I just use import serial I get the same error

$ python ser.py
Traceback (most recent call last):
  File "ser.py", line 1, in <module>
    import serial
  File "/Users/frankwiebenga/serial.py", line 8, in <module>
AttributeError: 'module' object has no attribute 'Serial'

Also, per comment. Created new file named something.py and still get the same error regardless of using import serial or from serial import serial.

$ python something.py 
Traceback (most recent call last):
  File "something.py", line 1, in <module>
    from serial import serial
ImportError: No module named serial

When running my bash script I get an output that is valid, so I know it isn't the Arduino code.

Output:

Requesting temperatures...DONE
Device 0: 25.62
Device 1: 25.75
Requesting temperatures...DONE
Device 0: 25.62
Device 1: 25.81

Bash:

while true  # loop forever
do
   inputline="" # clear input

   # Loop until we get a valid reading from AVR
   until inputline=$(echo $inputline | grep -e "^temp: ")
   do
      inputline=$(head -n 1 < /dev/tty.usbmodem621)
   done
   echo "$inputline"
done

Your script is named serial.py, which is confusing things when you do import serial. Rename your script to something else. — TJD
– TJD, Commented Aug 24, 2012 at 23:12
@atrueresistance, it sounds like you just created a new file named something.py rather than renaming the serial.py to something.py. You will have to rename or remove the script with the name serial.py. — Justin Peel
– Justin Peel, Commented Aug 24, 2012 at 23:33
@atrueresistance, you have to both do the renaming, and use the proper import command import serial. Your updated error has from serial import serial, which uses the wrong case for Serial. As dkamins mentions, use either import serial or from serial import Serial — TJD
– TJD, Commented Aug 25, 2012 at 0:07

Hashmush · Accepted Answer · 2012-08-24 23:02:28Z

2

You need to use import serial. serial is the name of the module and it does not contain an attribute with name serial.

http://pyserial.sourceforge.net/shortintro.html#opening-serial-ports

answered Aug 24, 2012 at 23:02

Hashmush

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dkamins · Accepted Answer · 2012-08-24 23:22:04Z

2

You can EITHER do:

from serial import Serial

s = Serial(...)

OR:

import serial

s = serial.Serial(...)

Choose one.

answered Aug 24, 2012 at 23:22

dkamins

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Comments

lemon · Accepted Answer · 2022-06-02 14:10:26Z

-1

You need do pip install pyserial instead of pip install serial (which does not run into an error but installs another module).

edited Jun 2, 2022 at 14:10

lemon

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answered Jun 2, 2022 at 12:30

Aidono

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