How to read analog signals?

[Archangel]

Hey joe Well this is the thing I want to setup a little project . You may remmeber me from the xbox 360 thread. But i didint get a chance on that. So i wanted to seeif i can acually get to read the trigger press and pulse out.


Also I wanted this to be done on a pic 12f683

Well The reason i want it on the same pin because I dont think i can kill 2 birds with one stone meaning as There is only on spot to read and fire of the controller which is called the wiper. I have seen this done before. So lets say i pull the trigger the pic reads the analog then it pulses low.

I did not forget . . . Here is what I am having trouble understanding "i pull the trigger the pic reads the analog then it pulses low" Exactly what do you mean by "the PIC reads the analog", What exactly must it see, to then make the pic pulse low? What state is the pin in when the condition is NOT met ? What state is it in when you want the pic to fire ?

[Acetronics2]

Hi Joe,

What I understand here is ...

IF input pin level is LOW, the Pic must Hold The pin LOW ...

Question ( useful ! )

When must the Pic release the pin ???


In clear Words ...

I pull the trigger of my gun ... and I want it to make a machine gun ... instead of single shot.

OR

I Want to transform an astable button into a bistable one ( ? )

Or something like that....


Looks using Comparator offers more Here ... Even if a Timer might be fired ...
12F629 ???

Alain

[thm ov3rkill]

hey Thanks ace.

Well again in words. The xbox 360 controller triggers have a analog signal when you press then down thats what it fires off...

so lets say I want to pull my trigger. if the pic reads( or sees what ever you want to call it) the analog signal that just came trough when i pressed the trigger it makes that same pin into a output and starts to pulses low and when i let go of it it stops and just goes back up top^^=].

[LinkMTech]

Here's something untested you can try. Two methods of rapid fire but you also need to add a 330 Ohm resistor between the button and the input so the PIC can sense a press then drive the same pin as an output even if you keep holding the button low.
I used the names pulse_fire and rapid_fire just to make them seperate.
If it does work for you, adjust the PAUSE times to suit your needs.

' This one fires off 5 shots per press or continueously if button held
pulse_fire:                 
    i=0                     ' Reset increment counter
    TRISIO = %00000001      ' Port 0 input, rest outputs
    while GPIO.0=1: Wend    ' Wait here until button pressed
    TRISIO = %00000000      ' Port 0 now an output
        for i=1 to 5        ' Set number of rapid fires per button press
            low GPIO.0      ' Hold output LOW
            pause 50        ' Held LOW for 50ms
            high GPIO.0     ' Turn OFF output
            pause 50        ' Keep OFF for 50 ms
        next i              ' 
goto pulse_fire             ' Go back, continue if button still pressed or 
                            ' wait until pressed again.
                            
' This one just continueously fires as long as button is pushed
rapid_fire:
    TRISIO = %00000001      ' Port 0 input, rest outputs
    while GPIO.0=1: Wend    ' Wait here until button pressed
    TRISIO = %00000000      ' Port 0 now an output
            low GPIO.0      ' Hold output LOW
            pause 50        ' Held LOW for 50ms
            high GPIO.0     ' Turn OFF output                                     
            pause 50        ' Keep OFF for 50 ms
goto rapid_fire             ' Go back, continue as long as button pressed

Here's the schematic to the resistor add on:

[thm ov3rkill]

hey thank you very much ill test it out tommorw. Well one question is this setup detecting a analog voltage then fires rapidfire

[LinkMTech]

You might be seeing a varying pulse width that looks like analog with your meter.

Hey after playing around and some testing with my new multimeter I found out this, The top pin is always low or ground the middle pin is 1.41 volt When the trigger is not held down, But when you start pressing the trigger it slowly starts decreasing, the more you hold it down the less the voltage gets. When i held the trigger down all the way It was at 0.31-0.30 volts thats afcourse when its down all the the way but even if you press it a little bit the voltage will decrease a little bit and the bottem pin of the 3 is at 1.61 volt all the time and doesent decrease nor increase. This is afcourse on this version of the controller while the other fires off high but not low like this

From: http://www.picbasic.co.uk/forum/show...4&postcount=27

Put a scope on it if you have one to make sure.
Just a thought.

[thm ov3rkill]

na pretty sure did research and saw other projects in devlopment in assemply

here is a pdf to read from it will help a lot I just want to finish this sucka up and play with it in the game =].

here is the pdf on all the info on the other project i also have it.

here I downlaoded it on rs since it exceeds ins 200kb's.

http://rapidshare.com/files/204649264/Opensource_Rapidfire_X360_Project2_2.pdf.html