[TriEmbed] IR remote signals

[Kevin McClaning]

Yup. Agree with Shane. If you look at the rising edge on the right hand 
side of the screen, that's the rise time that the current pull up can 
muster. The quick pulses of the modulation can't reach their full 
voltage because they're not on long enough.

Kevin

On 10/20/20 10:02 PM, Shane Trent via TriEmbed wrote:
> You need more pull-up. Use an external 1k pull-up and you should see 
> the square waves.
>
> On Tue, Oct 20, 2020 at 8:37 PM The MacDougals via TriEmbed 
> <triembed at triembed.org <mailto:triembed at triembed.org>> wrote:
>
>     See the attached scope shot…
>
>     This is one mark from a SONY remote captured by an LTR-301 IR
>     detector.
>
>     https://www.sparkfun.com/datasheets/Components/LTR-301.pdf
>     <https://www.sparkfun.com/datasheets/Components/LTR-301.pdf>
>
>     I have this device attached to an Arduino Uno and am using
>     INPUT_PULLUP (internal pullup on the pin).
>
>     I think that the wiggle on the scope between the cursors is the
>     40kHz modulation of the signal.
>
>     The cursors cover 10 wiggles and the scope reports 4.04 kHz.
>
>     My question is why is this wiggle of such small magnitude? I was
>     expecting to see full voltage swing.
>
>     Is it just this particular IR detector?  Is there something in the
>     datasheet that would indicate this?
>
>     ---> Paul
>
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> -- 
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> *Shane D Trent*
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