building my own reset

Archiver

Hi all,
I own a stampworks kit. as a beginner with little experience, I have
noticed that if I turn off my kit and turn it on, it sometimes
doesn't work the way it was supposed before the power was turned off.
For instance, the LCD sometimes doesn't work so I have to download
code again to the BS2SX. I have realized that pressing the reset
button also helps.

Here's the project I am doing:
A radio controlled talking digital clock

I have the receiver/decoder kit, voice chip, BS2SX, and Scott Edwards
2x16 serial LCD. Right now, I am just trying to display the time
coming from NIST frequency on an LCD. I don't have a problem when I
download code to the Stamp. It works just fine. It takes some time to
receive the signal but it works. However, if I turn the stampworks
off then turn it back on, nothing is displayed on the LCD unless the
reset button is pressed. My partners and I plan on building our own
PCB with the stamp, LCD, and the other mentioned components. I would
like to know the following:

1.) Is it necessary to implement a reset circuit?
2.) If the answer is yes (which I believe it is), how difficult would
it be to do so?
3.) Where can I go to find information on building a reset circuit?

What I would like to happen is for my system to automatically reset
once it is turned on.

Any input would be appreciated.

Sincerely,
RP

Archiver

What you may be experiencing is residual voltage in the NX-1000 power-supply
that is keeping the Stamp partially powered and not allowing the auto reset
circuitry to do its thing. The onboard reset is a N.O. switch connected
between the Stamp reset pin and ground.

-- Jon Williams
-- Parallax


In a message dated 10/25/01 9:34:48 PM Central Daylight Time,
rpsu279@y... writes:


> I own a stampworks kit. as a beginner with little experience, I have
> noticed that if I turn off my kit and turn it on, it sometimes
> doesn't work the way it was supposed before the power was turned off.
> For instance, the LCD sometimes doesn't work so I have to download
> code again to the BS2SX. I have realized that pressing the reset
> button also helps.
>
> Here's the project I am doing:
> A radio controlled talking digital clock
>
> I have the receiver/decoder kit, voice chip, BS2SX, and Scott Edwards
> 2x16 serial LCD. Right now, I am just trying to display the time
> coming from NIST frequency on an LCD. I don't have a problem when I
> download code to the Stamp. It works just fine. It takes some time to
> receive the signal but it works. However, if I turn the stampworks
> off then turn it back on, nothing is displayed on the LCD unless the
> reset button is pressed. My partners and I plan on building our own
> PCB with the stamp, LCD, and the other mentioned components. I would
> like to know the following:
>
> 1.) Is it necessary to implement a reset circuit?
> 2.) If the answer is yes (which I believe it is), how difficult would
> it be to do so?
> 3.) Where can I go to find information on building a reset circuit?
>
> What I would like to happen is for my system to automatically reset
> once it is turned on.
>
>




[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

Hello

> I own a stampworks kit. as a beginner with little experience, I have
> noticed that if I turn off my kit and turn it on, it sometimes
> doesn't work the way it was supposed before the power was turned off.
> For instance, the LCD sometimes doesn't work so I have to download
> code again to the BS2SX. I have realized that pressing the reset
> button also helps.
>
I always put "pause 500" as first statemlent in the code, it gives the power
supply and other electronics the time to stabilize, before execution really
starts (especially LCD's are very sensitive).

A second option is building a simple RC circuit that keeps the reset line
low for a while when the circuit is fired up.

> Met vriendelijke groetjes,
>
> ************************************************
> Michel De Meester
> Biotechnisch Onderhoud
> Universitair Ziekenhuis Antwerpen
> Wilrijkstraat 10
> 2650 Edegem - B
> tel: ++32 (0)3 821 36 47
> e-mail: michel.de.meester@u...
>
> *************************************************
>
>

Archiver

Its not nessesary to build a reset. Panasonic has a reset chip
which sells for about a dollar and works really well. I've been using
them for about a year and they work every time.You can get them from
digi-key electronics or digi-key.com. These devices are a standard
3pin TO-92 transistor style so it takes up almost no space on the
board. There called voltage detectors and they are on page 258 of
there April cataloge.


--- In basicstamps@y..., "De Meester, Michel"
<Michel.De.Meester@u...> wrote:
> Hello
>
> > I own a stampworks kit. as a beginner with little experience, I
have
> > noticed that if I turn off my kit and turn it on, it sometimes
> > doesn't work the way it was supposed before the power was turned
off.
> > For instance, the LCD sometimes doesn't work so I have to
download
> > code again to the BS2SX. I have realized that pressing the reset
> > button also helps.
> >
> I always put "pause 500" as first statemlent in the code, it gives
the power
> supply and other electronics the time to stabilize, before
execution really
> starts (especially LCD's are very sensitive).
>
> A second option is building a simple RC circuit that keeps the
reset line
> low for a while when the circuit is fired up.
>
> > Met vriendelijke groetjes,
> >
> > ************************************************
> > Michel De Meester
> > Biotechnisch Onderhoud
> > Universitair Ziekenhuis Antwerpen
> > Wilrijkstraat 10
> > 2650 Edegem - B
> > tel: ++32 (0)3 821 36 47
> > e-mail: michel.de.meester@u...
> >
> > *************************************************
> >
> >