Python and C++

[henkoegema]

For an Arduino project I made a C++ file like this:

Code: Select all

void setup()
	display a fixed text on a 20x4 LCD display

void main()
	detect motion from a sensor

How do I go forward to do the same in Python (for Raspberry pi) ?

So, the text on the display should only be setup once. The text doesn't change.
The motion detection should be in a while() loop.

(If needed I can post my C++ program for clarification)

[PeterO]

You start by learning Python ! We're here to help but we won't do your work or homework for you.

https://www.learnpython.org/

PeterO

[henkoegema]

For an Arduino project I made a C++ file like this:

Code: Select all

void setup()
	display a fixed text on a 20x4 LCD display

void main()
	detect motion from a sensor

How do I go forward to do the same in Python (for Raspberry pi) ?

So, the text on the display should only be setup once. The text doesn't change.
The motion detection should be in a while() loop.

(If needed I can post my C++ program for clarification)

For python, you don't needed setup. The python will take a care of it
You do did:

Code: Select all

def main():
   display a fixed text on a 20x4 LCD display 
    
   detect motion from a sensor

Thanks very much for this answer.

[paddyg]

the standard arduino

Code: Select all

bool dmpReady;
setup() {
  dmpReady = false;
}
loop() {
  dmpReady = !dmpReady;
}

in python is

Code: Select all

dmpReady = False
while True:
  dmpReady = not dmpReady

[henkoegema]

the standard arduino

Code: Select all

bool dmpReady;
setup() {
  dmpReady = false;
}
loop() {
  dmpReady = !dmpReady;
}
in python is

Code: Select all

dmpReady = False
while True:
  dmpReady = not dmpReady

Thanks, I got it working !

[hippy]

Code: Select all

void setup()
	display a fixed text on a 20x4 LCD display

void main()
	detect motion from a sensor

To convert to Python I would go for a literal translation ...

Code: Select all

def setup():
	display a fixed text on a 20x4 LCD display

def main():
	detect motion from a sensor

setup()
main()

[scotty101]

To convert to Python I would go for a literal translation ...

Code: Select all

def setup():
	display a fixed text on a 20x4 LCD display

def main():
	detect motion from a sensor

setup()
main()

Or more accurately to replicate the behavior of the main loop

Code: Select all

def setup():
	display a fixed text on a 20x4 LCD display

def main():
	detect motion from a sensor

setup()
while True:
    main()

[paddyg]

Yes. I was (slightly disingenuously) trying to make python look as easy to read and write as possible! There's a bit of an issue when you introduce setup() and main() as the arduino default variable scope is global but has to be explicit in python unless you just want to use the variable without changing it in which case you don't need to be explicit. so

Code: Select all

dmpReady = None

def setup():
  dmpReady = False

def main():
  dmpReady = not dmpReady

setup()
while True:
  main()  

Will complain that dmpReady is referenced before assignment.

[hippy]

Or more accurately to replicate the behavior of the main loop ...

Code: Select all

setup()
while True:
    main()

Thanks. Not familiar with 'Arduino C', but I thought using "main()" required the while within it which I thought the OP was adding. so, one or the other ...

Code: Select all

def setup():
  one-off stuff

def main():
  while True:
     repeated stuff

setup()
main()

Code: Select all

def setup():
  one-off stuff

def loop():
   repeated stuff

setup()
while True:
  loop()

[klintkrossa]

Hello,
I have two thoughts that may help, I just did a little with it and found that I now nothing about C.

Code: Select all

import ctypes

https://docs.python.org/3/extending/extending.html

I hope that helps.