Re: Separate pulses from edges?
- From: John Fields <jfields@xxxxxxxxxxxxxxxxxxxxx>
- Date: Sun, 25 Jun 2006 10:57:42 -0500
On 25 Jun 2006 08:31:50 -0700, "John O'Flaherty"
<quiasmox@xxxxxxxxx> wrote:
Now I see why you wanted those signals to go into the set/reset inputs
of a toggle flip-flop. This being your target, you might use John
Popelish's idea of a single time constant with an xor gate to get both
change signals on a single line. These could be used to reset an R/S
flip-flop. The set for that flip-flop would be your radio signal, and
the output of that flip-flop would go to another xor in the package to
reverse the current sense of the lights. That is, the radio signal
would turn the lights off if they would otherwise be on, on if they
would be off. Either normal day/night transition would reset the
sense-reversing flip-flop. The advantage of doing it this way is using
only a single time constant, with both signals on one line, and using a
single pair of gates for the R-S flip flop.
---
The disadvantage, however, is that it won't do what he wants it to
do, which is to turn ON at dusk automatically, (subject to an RF
override) and turn off at dawn automatically, also subject to an RF
override.
In order for that to happen he needs one positive-going pulse for
the SET input of his 4013, a _separate_ positive-going pulse for the
RESET input, and a CLOCK input from the RF detector. Also, the
4013's Qbar output needs to be connected to the D input, and the
signal from the RF detector needs to be debounced.
--
John Fields
Professional Circuit Designer
.
- Follow-Ups:
- Re: Separate pulses from edges?
- From: John O'Flaherty
- Re: Separate pulses from edges?
- References:
- Separate pulses from edges?
- From: Terry Pinnell
- Re: Separate pulses from edges?
- From: Terry Pinnell
- Re: Separate pulses from edges?
- From: John O'Flaherty
- Separate pulses from edges?
- Prev by Date: infrared proximity sensor
- Next by Date: Re: Adding delay to the pulse
- Previous by thread: Re: Separate pulses from edges?
- Next by thread: Re: Separate pulses from edges?
- Index(es):
Relevant Pages
|
