Word on the street is: Use a PIC with Schmitt trigger inputs for better results. Better results due to Schmitt triggers hysteresis's gives input port a snap action, dampens analog effect.
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Word on the street is: Use a PIC with Schmitt trigger inputs for better results. Better results due to Schmitt triggers hysteresis's gives input port a snap action, dampens analog effect.
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Originally Posted by Joe S.
Yesss Joe ...
Much better, as comparators directly can generate the interrupt ...
Over that I'd try to use a compensation stage to correct for ambiant light ... look at the attached scheme ... left side of Transistor T2.
Alain
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Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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IF there is the word "Problem" in your question ...
certainly the answer is " RTFM " or " RTFDataSheet " !!!
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Along the same lines, the data sheet for the part Alain points out has on page 11 another nice way of doing it.
http://www.google.com/url?sa=t&sourc...SILdHEv5RRcHYQ
Dave
Always wear safety glasses while programming.
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Hi, Dave
Not so nice ...
as the goal, here, is to take care the detectors are not saturated by light ...
Alain
************************************************** ***********************
Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
************************************************** ***********************
IF there is the word "Problem" in your question ...
certainly the answer is " RTFM " or " RTFDataSheet " !!!
*****************************************
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Maybe... but if the OPs part was to pass the two detectors causing the differential ?? then saturation may not be a problem ??
I am going to try it some day. Just an idea.
Dave
Always wear safety glasses while programming.
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Halas !!!
when saturated ... your detectors won't "see" anything ... both of them !!!
no differential signal nor ...
Alain
************************************************** ***********************
Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
************************************************** ***********************
IF there is the word "Problem" in your question ...
certainly the answer is " RTFM " or " RTFDataSheet " !!!
*****************************************
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I am thinking along the lines of both detectors being saturated but spaced maybe a centimeter or so apart. When the piece being detected cast a shadow on one and not the other then the differential. I guess it would only work if the light source was coming from one direction only........Darn, now I am back to square one
Dave
Always wear safety glasses while programming.
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From that datesheet, it said that the circuit will not be sensitive to changes in light as the source ages, this means saturate right?
That means I can't connect IR TX continously?
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