idea for scan button

[net_hw]

Hello All

I have a working code
that is using PIC 16F628, 6 capacitive input buttons
and its 6 correponding Outputs.
Everything is perfectly working
however I have a behavior that I would like to modify.

The system works as an auto repeat when the finger is left too long on the sensor.

6 sensors are sequentially scanned and in high speed
simulate a "mult tasking ".

I need to implement a code that prevent this behavior but without interfering with the scan of the other buttons.

This behavior is common to any press buttons scan
however I can post the code if someone believes to be necessary.

Thanks

Manoel
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[Ttelmah]

OK.
The capacitive touchpad systems are always 'self repeating'.
The way to handle this is to have your own timer, and if a key is 'seen' without having been 'released' for a period (say 1/4 second), then ignore the key.

Best Wishes

[asmboy]

A fail safe way to get only ONE press is to use a very VERY simple state machine code such that a very SHORT minimum delta -Time
is required to ACK the pressed state - and then activate on release ONLY.
(however long that might take)

I have used this logic on a portable MIL related gadget, and even though a bit unusual, BUT because of how the gadget is meant to be used, it was A-OK with the client. ( an ARMED led is lit on the press down, and the device operates single shot when released ).

This is very simple code to write.

[net_hw]

Okay,
Ttelmah thanks
I intuitively imagine that could be so
please you could cite some example for I try to join with my code?
----
asmboy also thank you, I understand your sugestion also should work fine, however I believe it would be more difficult to implement in conjunction with the capsense code that I'm using.

tks
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[asmboy]

to have us look at and maybe tweak your code

you need to post your code complete enough
that we can compile- and tell us your compiler version number while you are at it , ok??

[net_hw]

Hello everyone on behalf of other chores
I needed freeze this project for a while
he was living with the running problem

I have not been able to add the code that prevents
By repeating finger pressed long
although I know what do have make use TRM0 to measure the time of finger pressure while continuing
for the scanning of 6 keys is not by any pause

as requested follows a simplification of my code

I use a code Capsense that I collected from the internet and this works fine
I use 16F628 that already have at hand
intend buy larger PICs like 16F1937 with mTouch modules
in future for produce new modules.
but I think that this problem should persist
until I get the code that does the proposed

I am very grateful for any help

[jgschmidt]

Hi,

The way I usually control key repeat features is to use a counter for each key. This counter gets reset to 0 when the key is not pressed. Every time the key is scanned and pressed is TRUE, the counter increments. To avoid repeating, ignore the key if counter is greater then 1. I also use it for a slow repeating initially, for example repeat every 100 scans and then faster repeating every 25 scans by using modulus operator.

Just one approach that should be easy to insert into any code.

Cheers, Jurgen

------------------------------------
www.jgscraft.com

[net_hw]

hello, jgschmidt
thanks for your reply
a example would be better to understand your explanation
but I imagine it's something similar that I did yesterday

I get the code from this page
http://pcbheaven.com/picpages/A_Clever_Button/
and port asm code to CCS
and
put together my main routine
after replacing input() by the function Capsense()
it worked in the simulator
however I'm still not satisfied cos
is a blocking code
when CheckForLongClick happens, the scan stops
until the end of the function,
but already this works better than before
but I think that using one of TRMs or all of them
would be better
however still need help for this
thanks
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