Pyserial help

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December 13th, 2012, 01:14 AM

mrronoah

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Pyserial help

Ok so I have code that will print out the value of the slider to idle every 100 ms but how can i send this value to the serial port.
My current code looks like this:

Quote:

import serial
import time
import Tkinter

ser = serial.Serial('/dev/tty.usbmodem1411', 9600)
time.sleep(2)

root = Tkinter.Tk()

w = Tkinter.Scale(root, from_=0, to=100)
w.pack()

def show_slider(root,w):
millisecond = 1
print(w.get())
root.after(100*millisecond,show_slider,root,w)

show_slider(root,w)

root.mainloop()

December 13th, 2012, 11:17 AM

b49P23TIvg

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For python code please use [code] tags instead of [quote] tags.

I expect you'd open a file and write to it. On DOS the file might be called COM1, SER1, or even LPT1:

In unix I expect the file would be accessible somewhere in /dev . Haven't done it. (In 1983 I wrote a BASICA program that communicated with a serial device. Come to think of it, I also worked on a FORTRAN program that communicated with an external device with that microcomputer operating system that preceded DOS.)

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[code]Code tags[/code] are essential for python code!

December 13th, 2012, 08:09 PM

mrronoah

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[QUOTE=b49P23TIvg]For python code please use [code] tags instead of

Quote:

tags.

I expect you'd open a file and write to it. On DOS the file might be called COM1, SER1, or even LPT1:

In unix I expect the file would be accessible somewhere in /dev . Haven't done it. (In 1983 I wrote a BASICA program that communicated with a serial device. Come to think of it, I also worked on a FORTRAN program that communicated with an external device with that microcomputer operating system that preceded DOS.)

Haha sorry. I have the path to the microcontroller setup in the code and i can write to the serial port (ser.write("hello")) but i need the value of the scale to go to the serial port. Not the IDLE.

and i cant just put ser.write(w.get()) like i thought i would be able to, i get an error.
I'm so confused haha. Thanks

December 13th, 2012, 08:59 PM

b49P23TIvg

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Oh! Sorry, you do have
ser = serial.Serial('/dev/tty.usbmodem1411', 9600)

OK, so the problem may be data type. w.get() returns an integer.

ser.write(str(w.get()))

and of course that still might not work because Serial may need bytes.

Anyway, the problem may be data type. When debugging python the data type is often more useful to know than a human representation.

December 15th, 2012, 01:15 AM

mrronoah

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Quote:

Originally Posted by b49P23TIvg

Yes! it worked thankyou

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