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
<[email protected] <mailto:[email protected]>> 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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