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PICList Thread
'[OT - ish] PIC Microcontroller GCSE Projects'
1999\03\22@174335 by Sam Powell

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Please, do not stop reading straight away.

I am imminently meant to present my 'situ. brief' as to my GCSE project. My
problem is that I know exactly how I will do what I will do - involiving PIC
Microcontrollers, however I do not know what I should do. I have been
thinking and seatching for an idea for weeks now.If anyone reading this has
any ideas conforming to the below list *Please* e-mail me personally or post
to this ng thread. What I need, however, is not a design - but a problem
that:

1.) Is a genuine problem
2.) The divece created from this problem can implement some kind of linkup
to a PC for a reliable purpose.
3.) It must not do any *heavy* physical work.
4.) It must be specific - yet open to scope.

Thankyou *very* much, I so hope you can help,

Yours Faithfully,
                                 Sam Powell

--

ICQ: 10061444
E-Mail: spam_OUTspwebTakeThisOuTspamglobalnet.co.uk


ICQ: 10061444
E-Mail: .....spwebKILLspamspam@spam@globalnet.co.uk

1999\03\22@191301 by ry (Nahum Tchernihhovsky)

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Sam,
How about an IR  RS-232 terminal using irdA protocol?




Sam Powell <spwebspamKILLspamGLOBALNET.CO.UK> on 23/03/99 00:39:27

Please respond to pic microcontroller discussion list
     <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>

To:   EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU
cc:    (bcc: Nachum Tchernichovski/Visonic Ltd.)
Subject:  [OT - ish] PIC Microcontroller GCSE Projects




Please, do not stop reading straight away.

I am imminently meant to present my 'situ. brief' as to my GCSE project. My
problem is that I know exactly how I will do what I will do - involiving
PIC
Microcontrollers, however I do not know what I should do. I have been
thinking and seatching for an idea for weeks now.If anyone reading this has
any ideas conforming to the below list *Please* e-mail me personally or
post
to this ng thread. What I need, however, is not a design - but a problem
that:

1.) Is a genuine problem
2.) The divece created from this problem can implement some kind of linkup
to a PC for a reliable purpose.
3.) It must not do any *heavy* physical work.
4.) It must be specific - yet open to scope.

Thankyou *very* much, I so hope you can help,

Yours Faithfully,
                                 Sam Powell

--

ICQ: 10061444
E-Mail: spwebspamspam_OUTglobalnet.co.uk


ICQ: 10061444
E-Mail: @spam@spwebKILLspamspamglobalnet.co.uk

1999\03\23@114644 by Stan Ockers

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                     RE: [OT - ish] PIC Microcontroller GCSE Pr   3/23/99
Sam,

I have a problem that I have been slowly working on but would gladly have you solve for me.  I have a heart that occasionally goes into crazy rythms.  I would like to have a PIC log the timing between beats for me when this happens, especially when I'm asleep.

The main part of the logging I have already solved in my temperature datalogger. See http://www.iversoft.com/piclist and click on PICode.
The big stumbling block now is the sensor. If I ever get around to it I plan to use a TI TSL235 light to frequency converter hooked directly to the PIC.  An IR LED shines light through your finger on the TSL235.  As the capillaries expand with each pulse, more light is intercepted and the frequency goes down, ( about 3-4% ).  
I have hooked this up to a scope and you can watch the square wave expand and collapse with each beat.  The problem is that by moving you finger around only slightly or by positioning the point on your finger used ,you can change the base frequency anywhere from a few Khz up to 10 or more Khz.  You can glue the sensor and source into a thimble and stick your finger in and it helps.  But base frequency still depends on which finger is used and how it is inserted etc.  You are trying to pick off 1 second blips on a slowly varying background which may vary as much as the blips but over a longer period, say ten seconds or more.

Say you can get a fairly steady base frequency of 4Khz. To get a count of about 250 you would need an interval of about 63 milliseconds.  In one second you would have 16 of these intervals.  Suppose you had the PIC collecting intervals and look not at the absolute count but look at the previous and following counts as well and look for turn- arounds.  These would be times when both the previous and next counts were greater, (or less than),  than the present count.  These would be considered as 'beats' and the PIC would keep track of time between beats.  It wouldn't be very could resolution, 1:16,
but may be good enough to see gross changes.

Anyway,  just thought I'd mention it as a possibility.

Stan

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