Raspberry Pi Forums

Garvan

I would add an extra parameter to the class called cardvalue so the Card class can be used with any card game. And create an instance of the class like this, giving the card value my_card = Card("hearts","j",10) I am also learning python, and used the same tutorial as you, so if you can't figure it ...

Garvan

Lets try with a list, 1. Calculate average 2. Printing out the list and average to see what data we have. 3. Generating a random temp between 25 and 35 C 4. Add random temp to first element. 5. Rotate list to left by splitting it and adding 6. Print out 10 loops import random random.seed() lst = [30...

Garvan

[[Deleted]] See response below for reason code does not work.

Garvan

Code: Select all

firstname = "Ben"
letter1= firstname[0]
print("The first letter in your name is",  letter1)

Garvan

You followed the code, as it is presented in the tutorial, but it does not show a working counterclockwise function,.

If it works, it works.

If you motor does not run correctly counterclockwise (I expect vibration), when you have sent up the correct power supply, then post again here.

Raven

Garvan

Your clockwise code is correct, but counterclockwise is producing the wrong sequence (as far as I understand). arr1 = [1,1,0,0] arr2 = [0,1,0,0] def counterclockwise(): global arr1 # enables the edit of arr1 var inside a function global arr2 # enables the edit of arr2 var inside a function arrOUT = ...

Garvan

Keep the code to check keyboard state separate from the code to control the motor. Do you understand the sample code below? import pygame pygame.init() screen = pygame.display.set_mode((100,100)) def clockwise(): print ("Clockwise") def anticlockwise(): print ("AntiClockwise") def stop(): print ("st...

Garvan

Two days, and no progress. I think you will have to solve this issue yourself. I would start by inserting debug code everyplace (logging the results of every single line of code to file), or make a simple basic script that does nothing, and add functionality line by line until you identify what fail...

Garvan

scotty101 wrote: ↑
Wed Mar 25, 2020 2:45 pm
You could just have a small while loop with a time.sleep in it.
Code: Select all
running = True

def say_bye():
    global running
    print("Exit")
    running = False

while running:
    time.sleep(0.1)

Thanks, I will try this.

Garvan

I want to exit the program when a button is pressed in BlueDot. Is there a way to exit signal.pause()? Or an alternative to signal.pause()?

I can exit the program using Ctrl-C, but I will not have a keyboard attached in the finished project.

Garvan

The BlueDot documentation https://bluedot.readthedocs.io/en/latest/recipes.html uses pause() to pause program flow while threads are waiting for signals. You can "exit" pause() by pressing Ctrl-C to terminate the program. How do I cause pause() to exit in code? For example, if I want a double-press ...

Garvan

Should f.close() & g.close() be inside the wile loop? It looks to me that you are repeatedly opening URL's without closing them. This might be unrelated to your error.

Garvan

You can put your cleanup code after app.display() and it will run when app.display() closes.

Code: Select all

from guizero import App, Text

app = App()
text = Text(app, text="hello world")
app.display()
print ("Cleanup")

Garvan

Do you have a "thingspeak_key"? You could push the results in the try section for testing, and when you have it working, adjust to your liking. thingspeak_key = 'XXXXXXXXXXXXXXXX' try: humidity, temperature = Adafruit_DHT.read_retry(sensormodel, sensorpin) if humidity is None or temperature is None:...

Garvan

Ok. I recommend holding the web code until you get the sensor and switches working. # Imports import Adafruit_DHT from energenie import radio, encoder sensormodel = Adafruit_DHT.AM2302 sensorpin = 4 tempthreshold = 20 GREEN_ON = encoder.build_switch_msg(True, device_address=1) GREEN_OFF = encoder.bu...

Garvan

I find it difficult to tell what is working and what is not working, so forgive the silly questions. Does this work? # Imports import Adafruit_DHT # Attempt to get a sensor reading. The read_retry method will # retry up to 15 times, waiting 2 seconds between attempts sensormodel = Adafruit_DHT.AM230...

Garvan

This is an error

Code: Select all

    t=time.time()
    r=time.time()-t

Every time you call time.time() it returns the current time, so r will be equal to a tiny number.

What you should do is move r=time.time()-t down to after the button is pressed, so it is equal to the reaction time.

Garvan

A segmentation fault is a memory error, you are accessing (reading or writing) an un-initialized function or memory address. Normally in this case you will go through your code commenting out one line at a time, until you find our which line is causing the error. You might insert print statements to...

Garvan

You should just try it, it would be quicker than asking, but it wont work the way you are hoping. The python source code is loaded into memory on start, so any edits you make to the source will not be executed until the program is run a second time.

Garvan

<snip> https://www.raspberrypi.org/products/type-c-power-supply/ Clicking on this link and selecting the type I need tells me "there are no global supplies for this model".That said, I do have a working wart, official or otherwise, I don't really know. What I want is more options in design. I am lo...

Garvan

You might get some information on the issue in this thread https://www.raspberrypi.org/forums/viewtopic.php?t=241919 from last year. The first line of the error message is the same. First thing I would make sure that my system is up-to-date. See: https://www.raspberrypi.org/documentation/raspbian/up...

Garvan

In your code you open a file, write to it, close it and then open it again. This will not work. Everything you wrote to the file the first time is deleted when you open it for writing a second time. And as mentioned above, you have no loop. Study this simple program. It opens a file, writes two line...

Garvan

And what is output by the Python script? Mr.Ohanlon used to check in here, he may yet pop up. The script prints out the raspberry pi Bluetooth address, in my case DC:A6:32:20:9E:C6, then it sits there waiting for a connection. I got it working. In the BlueDot application on my phone, I selected "Se...

Garvan

Do you have a Blue Dot application (such as the sample app) running when you try to connect from the phone? Yes, I run the script provided. from bluedot import BlueDot bd = BlueDot() bd.wait_for_press() print("Hello World") 1. My phone pairs successfully with RPi4 GUI interface . 2. I start the bd....

Garvan

I tried a third time, just to confirm the python script was running. It does not connect, no error message, nothing. So what do I report to the author/developer/maintainer on https://github.com/martinohanlon/BlueDot? I would feel like a fool saying "it does not work", with nothing useful to add.

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