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thanks for the help.
I just breadboarded the circuit with the RC circuit and the instability has
gone away. Now I have to get the extra components on to the HB :)
see the datasheet for details:
http://www.sharp.co.jp/ecg/db19992000/pdf/irdusrc/is1u621.pdf
Wayne
In lugnet.robotics.handyboard, Dennis Clark writes:
> In lugnet.robotics.handyboard, Wayne Crosbie writes:
> > I just added the Sharp IS1U621 to my handyboard. That is apparently a • substitute
> > for the ISU160. When I run the simple test program:
> >
> > while (1) {if (4 & peek(0x1000)) fd(0); else bk(0);}
> >
> > lights continuously flicker. When I put my logic proble on the output, it is
> > continuous pulse. The demodulator does not seem to be working. I also tried a
> > second part with the same result.
> >
> > data sheet for these parts seems to indicate the need for some capacitors on
> > the supply and output (47uF and 1000pF respectively)
>
> These are NOT optional components. I saw the same thing with the IS1U60
> if I didn't use the 47uf/47ohm low-pass filter on the Vdd input to the part.
> Use it, your problem will go away.
>
> have fun,
> DLC
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Message is in Reply To:
 | | Re: Help with IR receive
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| (...) substitute (...) These are NOT optional components. I saw the same thing with the IS1U60 if I didn't use the 47uf/47ohm low-pass filter on the Vdd input to the part. Use it, your problem will go away. have fun, DLC (25 years ago, 17-Dec-99, to lugnet.robotics.handyboard)
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