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'[EE] Stepper motor asanencoder-andaccidentalmicrop'
> Is your application secret or can you share it with us ?
It's for an art installation. A friend wants one moving spotlight to highlight
a series of pieces in sequence, as directed by the soundtrack. Looked at
a variety of options, this way seems the tidiest and user-friendliest
> Could you check your logic on Fig. 2? It's not working the way
> that I would expect it to. Do you need a pull down resistor in the
> present configuration?
Ah, good point. The diodes are isolating INT0 from the low of the
comparator, so a pull down would be needed. Without a pull down
the input is effectively floating high when the driver is low
There'll be a voltage drop through the diode to consider, and the pull
down value will have to be large enough not to divide the post-diode
voltage below the input L-H threshhold. >10k should probably do
I've updated the page. I'll also get around to Russell's long-tail pair
idea today and add the results of that experiment
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