BS1 Rev D Reset?
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Anyone know why the BS1 Rev D has no reset? Can one be added?
I'm trying to integrate one into a retired RC car for line following and I
need a way to restart the code until I can fit something else.
I'm trying to integrate one into a retired RC car for line following and I
need a way to restart the code until I can fit something else.
Comments
>
>I'm trying to integrate one into a retired RC car for line following and I
>need a way to restart the code until I can fit something else.
The rev D has the reset pin on the PIC chip tied directly to the +5
volt power supply, so you can't get at it without hacking. You can
reset it though simply by turning the power off and on. That is no
big deal because the chip only draws 2 ma when running. The power
supply must turn on fast and clean to get a good reset with the PIC
chip's built-in reset circuit. The more recent BS1-IC has a standard
external reset chip, the purpose of which let it respond to slowly
rising power supplies and to brownouts.
-- Tracy
I was trying to cobble together a line follower out of an RC car and I
didn't want to waste too many parts or too much time until I start making
the final version. I've got the board and battery tied down to a piece of
plastic and wanted a way to restart it without disconnecting the battery.
The eventual game plan is to have a photocell or something you wave your
hand over to start the car.
The Rev D is already bought, so the other processor is not an option right
now. I guess the description of the two processors being electrically
equivalent is not totally correct?
Original Message
> >Anyone know why the BS1 Rev D has no reset? Can one be added?
> >
> >I'm trying to integrate one into a retired RC car for line following and
I
> >need a way to restart the code until I can fit something else.
> The rev D has the reset pin on the PIC chip tied directly to the +5
> volt power supply, so you can't get at it without hacking. You can
> reset it though simply by turning the power off and on. That is no
> big deal because the chip only draws 2 ma when running. The power
> supply must turn on fast and clean to get a good reset with the PIC
> chip's built-in reset circuit. The more recent BS1-IC has a standard
> external reset chip, the purpose of which let it respond to slowly
> rising power supplies and to brownouts.
>
interpretor/build your own stamp are as well. I never could get servos to
work off the build your own style of stamps, but easily drive servos off the
BS2IC. Considering the hundreds of Typo errors in Parallax's documentation I
am not surprised.
At 12:30 PM 4/11/2001 -0500, you wrote:
>Gracias.
>
>I was trying to cobble together a line follower out of an RC car and I
>didn't want to waste too many parts or too much time until I start making
>the final version. I've got the board and battery tied down to a piece of
>plastic and wanted a way to restart it without disconnecting the battery.
>The eventual game plan is to have a photocell or something you wave your
>hand over to start the car.
>
>The Rev D is already bought, so the other processor is not an option right
>now. I guess the description of the two processors being electrically
>equivalent is not totally correct?
>
>
Original Message
>
>> >Anyone know why the BS1 Rev D has no reset? Can one be added?
>> >
>> >I'm trying to integrate one into a retired RC car for line following and
>I
>> >need a way to restart the code until I can fit something else.
>
>> The rev D has the reset pin on the PIC chip tied directly to the +5
>> volt power supply, so you can't get at it without hacking. You can
>> reset it though simply by turning the power off and on. That is no
>> big deal because the chip only draws 2 ma when running. The power
>> supply must turn on fast and clean to get a good reset with the PIC
>> chip's built-in reset circuit. The more recent BS1-IC has a standard
>> external reset chip, the purpose of which let it respond to slowly
>> rising power supplies and to brownouts.
>>
>
>
>
>
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
Sincerely
Kerry
Admin@M...
WWW server hosting [url=Http://mntnweb.com]Http://mntnweb.com[/url]
Kerry Barlow
p.o. box 21
kirkwood ny
13795
Well, you could hack the rev D. Pin 4 on the PIC dip chip is the
reset. I don't have a rev D board in front of me to check the
traces, but let's say you could cut the trace that leads to that pin.
Or just take the chip out of its socket, and bent pin 4 out so it
doesn't go back into the socket. Connect a 5k pullup resistor from
the pin to +5 volts. And connect a wire from the pin to the top side
of a pushbutton or sensor, the other side to ground, and there is
your reset. The rise and fall times on the reset input do not have
to be real fast, because the PIC has a built in threshold detector on
that pin. However, noise on that pin would show up as erratic
behavior in the car!
--good luck!
Tracy Allen
electronically monitored ecosystems
http://www.emesystems.com
>Rodent wrote:
>Gracias.
>
>I was trying to cobble together a line follower out of an RC car and I
>didn't want to waste too many parts or too much time until I start making
>the final version. I've got the board and battery tied down to a piece of
>plastic and wanted a way to restart it without disconnecting the battery.
>The eventual game plan is to have a photocell or something you wave your
>hand over to start the car.
>
>The Rev D is already bought, so the other processor is not an option right
>now. I guess the description of the two processors being electrically
>equivalent is not totally correct?
>
>
Original Message
>
> > >Anyone know why the BS1 Rev D has no reset? Can one be added?
> > >
> > >I'm trying to integrate one into a retired RC car for line following and
>I
> > >need a way to restart the code until I can fit something else.
>
> > The rev D has the reset pin on the PIC chip tied directly to the +5
> > volt power supply, so you can't get at it without hacking. You can
> > reset it though simply by turning the power off and on. That is no
> > big deal because the chip only draws 2 ma when running. The power
> > supply must turn on fast and clean to get a good reset with the PIC
> > chip's built-in reset circuit. The more recent BS1-IC has a standard
> > external reset chip, the purpose of which let it respond to slowly
> > rising power supplies and to brownouts.