Raspberry Pi Forums

paddyg

Hi, I glad (and maybe slightly surprised) it worked with only minor indent mismatch! For your own sanity you should get used to putting all your imports at the top (but after the `#!/usr/bin/env python3`) then globals, constants etc. If you stick to a system it will make debugging easier; sensible t...

paddyg

well you might find a better example among all the recipes in the docs but I would do something along the lines of this (untested), using LED as generic output and Button for input, may be more appropriate ones (i.e. digitalInputDevice, digitalOutputDevice) from gpiozero import Button, LED from sign...

paddyg

Hi, I would use the https://gpiozero.readthedocs.io/en/stable/recipes.html module it breaks each 'action' out into a function like you've done with your pulse meter. Have a look at that and post again if you get stuck or something doesn't make sense.

Paddy

paddyg

This https://www.raspberrypi.org/forums/view ... =omxplayer poster had some issues wrapping omxplayer in python and, I think, managed to sort something out. Not the same specific problem as yours but might have similar solution.

paddyg

Did you get an error message when you ran the program? If you did that will probably tell you what the problem was. If you didn't then you should add print() statements to try to figure out what's not working. However if you really know no python then you will find it very difficult and I would sugg...

paddyg

well, at a guess something like (not tested): ... # this is a global 'const' so conventionally uses CAPS SEGMENT_PATTERN = [[0,1,2,3,4,5],[1,2],[0,1,6,4,3],[0,1,2,3,6],[1,2,5,6],[0,2,3,5,6], #0 to 5 [0,2,3,4,5,6],[0,1,2],[0,1,2,3,4,5,6],[0,1,2,5,6],[0,1,2,4,5,6], #6 to A [2,3,4,5,6],[0,3,4,5],[1,2,3...

paddyg

With gpiozero you 'attach' functions to the Button instance to do the work for you https://gpiozero.readthedocs.io/en/stable/recipes.html#button. For your code, approximately (not tested) import RPi.GPIO as IO from gpiozero import LED from gpiozero import Button import time # you can do this - googl...

paddyg

I was really just going by the error message the OP quoted But isn't frame a instance of type Mat? You may well ask! I find the python opencv docs almost impenetrable; they unhelpfully show Python: cv2.imdecode(buf, flags) → retval If you want to find out what a 'retval' is the only way seems to be ...

paddyg

Well that doesn't sound too weired at all. You almost certainly didn't use pip3 on your old card.

I haven't needed to use smbus but I would heed the advice of a 'regular' like @bensimmo

paddyg

Assuming that you are using `$ python3 simple_smbus2_test.py` on both and `/usr/local/lib/..*../dist-packages/` is the same on both then it's not obvious. Once or twice I've had a missing module error message that was solved by deleting all the *.pyc files

paddyg

It's hard to know what you actually did but '...I copied the text from the Leafpad to the Nano...' sounds a little bit odd. What I would do is first open a terminal then $ cd '/home/pi/Python-Programs/tutorials/matplotlib tutorial (sentdex)/' $ nano stuff_for_part7 ####### now in the editor delete t...

paddyg

Hmm, python is normally good at telling you exactly what the problem is and which line is causing it; does that help? I would expect you to need to do def remove(): r = table.currentRow() if r >= 0: dlg.lineEdit_Budget.setText(str(float(table.item(r,1).text()) + float(dlg.lineEdit_Budget.text()))) d...

paddyg

After the line where you `r = table.currentRow()` check that it's >= 0 (I think it will be -1 if no row is selected) You can then either pop up an alert or change a label field accordingly.

paddyg

you probably need to edit the file with nano (or other editor that doesn't add extraneous characters)

paddyg

Maybe it's notepad. Try opening your file from a terminal with nano and tidy up any extraneous characters see https://stackoverflow.com/questions/46427317/notepad-adds-ufeff0-to-the-beginning-of-some-files-making-it-unable-to-merg PS numpy has genfromtxt() which might allow you to bypass your csv im...

paddyg

Not really sure what you are intending to yield, or how it is to be consumed... but if you want to concatenate your b'Content...' with a numpy array you might have to convert it to raw bytes with something like tobytes() b'Content-Type: image/jpeg\r\n\r\n' + frame.tobytes() + b'\r\n') It's probably ...

paddyg

it migh work if you added to your while condition in threads.. or not q.empty (): but it still won't clear the queue after the gpiozero goes down (would loop forever) maybe better to put the two lines I suggested previously just before the return. You could put the same in your clear up instead of t...

paddyg

can you just

Code: Select all

while not q.empty():
   q.get()

How are you stopping your threads, presumably there is a signal passed through the Queue.

paddyg

The standard way would be to put all of your pre-defined stuff at the beginning like WHITE = Color(255, 255, 255) RED = Color(255, 0, 0) GREEN = Color(0, 255, 0) # etc, then DIGITS = [(BLACK, WHITE, YELLOW, WHITE, YELLOW, WHITE, YELLOW), (RED, BLACK, GREEN... (WHITE, GREEN... )] while True: for c, i...

paddyg

OK, after a quick google https://linux.die.net/man/1/amixer I would suggest using 'amixer set Speaker mute' and '... unmute' instead of toggling. i.e. something like (again untested. And you see how I've tried to reduce the duplication in the increase and decrease functions by having a change functi...

paddyg

hi. the obvious solution would be to use amixer to determine state rather than a variable in the python code. I will have a look at some stage.

paddyg

Ah, you need to set the global variable and check it in the other functions so something along the lines of: (not checked or tested) #!/bin/python from gpiozero import Button from signal import pause from subprocess import Popen def increase_volume(): global is_muted if is_muted: toggle_volume() Pop...

paddyg

Hi, I don't think you need to set up a different `Button` as you're not using an additional physical button. You just need to add to the existing behavior of your existing button(s). I would try something like ... def mute_volume(): Popen(['amixer', 'set', 'Speaker', 'toggle']) button_up = Button(20...

paddyg

If you want to keep on triggering increase or decrease then you will need to keep your program running in a loop. In gpiozero (or GPIO using callback functions) then the loop can just be a pause as in the code below. Alternatively it could be a `while True:` kind of thing. It might not matter most o...

paddyg

In python you can run terminal commands quite easily using the subprocess module. Best look up the documentation but you might do something like import subprocess ... def change_volume_function(percent_change): if percent_change < 0: sign_char = '-' else: sign_char = '+' change_str = '{}%{}'.format(...

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