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'[EE]: I am dissecting a Motorola TracPhone'
2007\10\10@112406 by Cedric Chang

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I have gotten to the point  where the dome covers for the switches  
have been removed.  I am trying to determine how the switch contacts  
are sampled ?  Any ideas ?

See oh-god.com/tracphone for short videos

Best

Cedric

2007\10\10@161741 by alan smith

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sampled? you mean if they are in a matrix or what? Last keypad board I design I was involved used a pic to read the contacts, do debounce and send over an encoded value via i2c

Cedric Chang <spam_OUTccTakeThisOuTspamnope9.com> wrote: I have gotten to the point  where the dome covers for the switches  
have been removed.  I am trying to determine how the switch contacts  
are sampled ?  Any ideas ?

See oh-god.com/tracphone for short videos

Best

Cedric

2007\10\10@191928 by Cedric Chang

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>
> On Oct 10, 2007, at 2:17 PM, alan smith wrote:
>
> sampled? you mean if they are in a matrix or what? Last keypad  
> board I design I was involved used a pic to read the contacts, do  
> debounce and send over an encoded value via i2c
>
> Cedric Chang <.....ccKILLspamspam@spam@nope9.com> wrote: I have gotten to the point  
> where the dome covers for the switches
> have been removed.  I am trying to determine how the switch contacts
> are sampled ?  Any ideas ?
>
Yes, do cell phone sample the keys via homeruns or by using a matrix ?
>
> See oh-god.com/tracphone for short videos
>
> Best
>
Cedric

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