Re: Implementing a multivibrator function with python
I am actually running python on raspberry pi. The trigger event is a button-press. On Monday, November 11, 2013 6:56:03 PM UTC+8, Dave Angel wrote: On Mon, 11 Nov 2013 01:41:58 -0800 (PST), JL lightai...@gmail.com wrote: - If the event happens again before the 5secs expire, the high duration will be extended by another 5 secs. This works like a retriggerable multivibrator for those who are into electronics. More precisely a retriggerable monostable multivibrator. The question makes little sense unless you're running in an event driven environment, such as a gui. Name the environment and somebody can probably help. -- DaveA -- https://mail.python.org/mailman/listinfo/python-list
Re: Implementing a multivibrator function with python
On Tue, 12 Nov 2013 06:44:05 -0800, JL wrote: I am actually running python on raspberry pi. The trigger event is a button-press. On Monday, November 11, 2013 6:56:03 PM UTC+8, Dave Angel wrote: On Mon, 11 Nov 2013 01:41:58 -0800 (PST), JL lightai...@gmail.com wrote: - If the event happens again before the 5secs expire, the high duration will be extended by another 5 secs. This works like a retriggerable multivibrator for those who are into electronics. More precisely a retriggerable monostable multivibrator. The question makes little sense unless you're running in an event driven environment, such as a gui. Name the environment and somebody can probably help. -- DaveA How critical is the output pulse time? is it a state that can be polled to regularly changed if the timeout has been exceeded or does it need to switch in the background? if you need to trigger switch in the background you will probably need to start playing with threads or multiprocessing. greater detail on what you are trying to achieve project wise may assist here -- https://mail.python.org/mailman/listinfo/python-list
Re: Implementing a multivibrator function with python
Op 12-11-13 15:44, JL schreef: I am actually running python on raspberry pi. The trigger event is a button-press. That doesn't help. What does that button-press cause in terms of the OS. Does it cause a signal? Does it produce a number of bytes that can be read from some file like object? Something else? This is not python specific, the answer to those questions is needed no matter what language you use to implement your function. -- Antoon Pardon -- https://mail.python.org/mailman/listinfo/python-list
Re: Implementing a multivibrator function with python
On Tue, Nov 12, 2013 at 11:37 AM, Antoon Pardon antoon.par...@rece.vub.ac.be wrote: Op 12-11-13 15:44, JL schreef: I am actually running python on raspberry pi. The trigger event is a button-press. That doesn't help. What does that button-press cause in terms of the OS. Does it cause a signal? Does it produce a number of bytes that can be read from some file like object? Something else? This is not python specific, the answer to those questions is needed no matter what language you use to implement your function. This interests me because I started out in Electrical engineering school in college. I'm intrigued by raspberry pi. I bet you would find specific answers reading about how the hardware works. Does Raspberry pi come with push buttons that are connected to some io ports or a usb port or a keyboard or? If there is no physical switch, one of the gui frameworks for python certainly will have hooks to invoke code when a (virtual) button is pressed. Maybe find a Raspberry pi newsgroup? -- Antoon Pardon -- https://mail.python.org/mailman/listinfo/python-list -- Joel Goldstick http://joelgoldstick.com -- https://mail.python.org/mailman/listinfo/python-list
Implementing a multivibrator function with python
I am trying to implement a multivibrator function with python. This is how it works; - An trigger event happens - Upon receiving the event, a variable goes high for 5secs, then go low. - If the event happens again before the 5secs expire, the high duration will be extended by another 5 secs. This works like a retriggerable multivibrator for those who are into electronics. Is there some sample code for this problem or can someone point me to using the right library for this feature? Thank you very much. -- https://mail.python.org/mailman/listinfo/python-list
Re: Implementing a multivibrator function with python
On Mon, 11 Nov 2013 01:41:58 -0800 (PST), JL lightai...@gmail.com wrote: - If the event happens again before the 5secs expire, the high duration will be extended by another 5 secs. This works like a retriggerable multivibrator for those who are into electronics. More precisely a retriggerable monostable multivibrator. The question makes little sense unless you're running in an event driven environment, such as a gui. Name the environment and somebody can probably help. -- DaveA -- https://mail.python.org/mailman/listinfo/python-list
Re: Implementing a multivibrator function with python
On 11/11/2013 4:41 AM, JL wrote: I am trying to implement a multivibrator function with python. This is how it works; - An trigger event happens - Upon receiving the event, a variable goes high for 5secs, then go low. - If the event happens again before the 5secs expire, the high duration will be extended by another 5 secs. This works like a retriggerable multivibrator for those who are into electronics. Is there some sample code for this problem or can someone point me to using the right library for this feature? Python 3.4 will have a new asyncio package that includes an event loop module. It will be in the forthcoming 3.4.b0 release; it might be in 3.4.a4 but I have not installed that yet. In any case, I believe it should make the above easy. -- Terry Jan Reedy -- https://mail.python.org/mailman/listinfo/python-list
Re: Implementing a multivibrator function with python
Op 11-11-13 10:41, JL schreef: I am trying to implement a multivibrator function with python. This is how it works; - An trigger event happens - Upon receiving the event, a variable goes high for 5secs, then go low. - If the event happens again before the 5secs expire, the high duration will be extended by another 5 secs. This works like a retriggerable multivibrator for those who are into electronics. Is there some sample code for this problem or can someone point me to using the right library for this feature? Thank you very much. The problem is that it depnds on the kind of trigger event. Is it a signal? Is it a character that arrives through a pipe or socket? I would take a look at the signal module and see if it can get you started. -- Antoon Pardon -- https://mail.python.org/mailman/listinfo/python-list
