[dorkbotnyc-blabber] Looking for the right off-the shelf component

[Alison Lewis]

Hi Chris:

Well, that is true. That is why I was thinking I could get a multiplexer to
have three different channels. I have a analog joystick that has to run a
pan tilt camera.

Switch 1 (closed)= 5Volts
Switch 2 (open) = 0Volts
2.5 Volts - is the common. (so when no switch is pushed, this is the output)

I would like to use a PIC (as its easier) however, my company says they do
not want to use a Microcontroller. So I am looking into other options.

- Alison



 |   On Fri, Dec 19, 2008 at 3:16 PM, Chris Vecchio<cvecchio at noisemantra.com
>
 |   wrote:

>
> Binary logic is, well, binary - either 1 or 0 and no in between.
> The chips are often designed to prevent any ambiguous voltages (like 2.5).
>
> What exactly are you trying to do?
> There may be a simple analog way to do it
> (like making a D/A converter with some
> resistors to give you voltages in between 0 and 5V).
>
> No switches closed = 2.5V, one switch closed = ?
>
>      - Chris
>      www.noisemantra.com
>
>
>
>
>
>
> -------Original Message-------
> From: Alison Lewis
> Subject: Re: [dorkbotnyc-blabber] Looking for the right off-the shelf
> component
> Sent: 19 Dec '08 20:48
>
> Lee:
>
> Can I ask you something about these NOR gate ICs - I have one now
> (74HCT4002) and its pretty easy. But what if you have three states and only
> one output? I've tried a number of options, but it seems to me that I can
> only get either HI or LOW outputs from this IC. I'd like to have HI, LOW,
> and Middle (2.5V). I am thinking that a multiplexer is the right way to go,
> but I wanted to ask you first since you seem to know pretty well.
>
> All my best,
> Alison
>
>
> On Mon, Nov 24, 2008 at 11:22 AM, Lee von Kraus <leevonk at gmail.com> wrote:
>
>> use 'nor gate' ICs like the IC 7402
>>
>> description:
>> http://hyperphysics.phy-astr.gsu.edu/Hbase/Electronic/nor.html
>>
>> where to buy:
>>
>> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=DM7402N-ND
>>
>> -Lee
>>
>>
>>
>> On Mon, Nov 24, 2008 at 11:07 AM, Alison Lewis <lewischicken at gmail.com>wrote:
>>
>>> Hi all:
>>>
>>> I've been asked to hack into a sensor that has four contacts (it acts
>>> somewhat like a hand built joystick to control a moving image). Basically, I
>>> am looking for a simple circuit that can do logic to know if any of the four
>>> contacts are closed. If they are all open, then it should send out 2.5
>>> Volts. I can program a PIC to do this, but I was hoping there was an off the
>>> shelf solution out there somewhere. I was also thinking a timer could do the
>>> trick, but I am open to other suggestions if you have any.
>>>
>>> Thank You,
>>> Alison
>>>
>>>
>>> ........................................................................
>>> .........dorkbot: people doing strange things with electricity..........
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>>> ........................................................................
>>>
>>>
>>
>> ........................................................................
>> .........dorkbot: people doing strange things with electricity..........
>> ..........................http://dorkbot.org............................
>> ........................................................................
>>
>>
>
>
> --
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> www.alisonlewis.com
> www.iheartswitch.com
> ::::::::::::::::::::::::::::::::::::
> ------------------------------
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> .........dorkbot: people doing strange things with electricity..........
> ..........................http://dorkbot.org............................
> ........................................................................
>
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-- 
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www.alisonlewis.com
www.iheartswitch.com
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