stamp to stamp serial burnout?
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Posts: 46,084
Hello,
I've been trying sending serial data from one stamp to another. I have the
transmitting stamp connecting vss to the recieving stamp vss, and vdd to
the receiving stamp vss. I was trying this earlier in the week and it was
working fine, but tonight after I was doing it for a little while, my
transmitting stamp stopped working. When I tried to download code into it
it said hardware not found. Also, I noticed that the pic itself was hot,
never a good sign. So it seems clear that I burnt out the stamp, but I
wonder what I did wrong. I had the transmitting stamp in a carrier board on
a plastic table, could it have been static electricity? Is it incorrect to
directly connect two stamps like that?
opinions?
I've been trying sending serial data from one stamp to another. I have the
transmitting stamp connecting vss to the recieving stamp vss, and vdd to
the receiving stamp vss. I was trying this earlier in the week and it was
working fine, but tonight after I was doing it for a little while, my
transmitting stamp stopped working. When I tried to download code into it
it said hardware not found. Also, I noticed that the pic itself was hot,
never a good sign. So it seems clear that I burnt out the stamp, but I
wonder what I did wrong. I had the transmitting stamp in a carrier board on
a plastic table, could it have been static electricity? Is it incorrect to
directly connect two stamps like that?
opinions?
Comments
>Hello,
>
>I've been trying sending serial data from one stamp to another. I have the
>transmitting stamp connecting vss to the recieving stamp vss, and vdd to
>the receiving stamp vss.
sorry, I meant stamp 1 vss > stamp 2 vss, and stamp 1 vdd to stamp 2 vdd
Thats +5 vdc to +5vdc and if one of the vdd pins dropped voltage even
momentarily, you hit the voltage regulator with reverse 5 volts.
For serial comms, all you need is the two vss pins connected and one of
the numbered I/O pins on each stamp connected.
Don
Original Message
From: "raoul vaneigem" <raoul@c...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, May 09, 2002 10:36 PM
Subject: Re: [noparse][[/noparse]basicstamps] stamp to stamp serial burnout?
> At 10:24 PM 5/9/2002 -0700, you wrote:
> >Hello,
> >
> >I've been trying sending serial data from one stamp to another. I have
the
> >transmitting stamp connecting vss to the recieving stamp vss, and vdd to
> >the receiving stamp vss.
>
> sorry, I meant stamp 1 vss > stamp 2 vss, and stamp 1 vdd to stamp 2 vdd
>
>
>
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>
>
>
This is either a condition known as a direct short to ground, or what we
call a tapographical error. But seriously Vdd to Vdd should be ok as long as
the total loading is not excessive, if it is, try connecting their Vin pins
together or use an external 5 volt regulator to the Vdd pins. If the sending
stamp is dead it might be just an internal regulator burn-out in which case
an external regulator should solve the problem, try 78L05 or if you need
more current a 78M05 is rated 500ma, still not enough use a 7805.
KF4HAZ - Lonnie
From: "raoul vaneigem" <raoul@
> Hello,
>
> I've been trying sending serial data from one stamp to another. I have the
> transmitting stamp connecting vss to the recieving stamp vss, and vdd to
> the receiving stamp vss. I was trying this earlier in the week and it was
> working fine, but tonight after I was doing it for a little while, my
> transmitting stamp stopped working. When I tried to download code into it
> it said hardware not found. Also, I noticed that the pic itself was hot,
> never a good sign. So it seems clear that I burnt out the stamp, but I
> wonder what I did wrong. I had the transmitting stamp in a carrier board
on
> a plastic table, could it have been static electricity? Is it incorrect to
> directly connect two stamps like that?
>
> opinions?
make an error in building the power supply. I have a device I made up
the uses a 12vdc supply into a 7508 regulator that supplied 8 volts to
the stamp for what I thought would be a regulated Vin. I use the 12vdc
side of the regulator to power some small lamps thru a relay activated
by a transistor switch off a BS2 pin. I found the BS2 program worked
fine until an event occurred that triggered the relay, then the stamp
went into a reset loop as long as that event was active. Found out that,
with my poor eyesight and lack of attention, I had stuck a 10mf cap on
the 12vdc input rather than a 1000mf cap as designed. The load of the
lamps was enough to throw the voltage regulation way out which was
affecting the 8vdc Vin. When I replaced that cap with the 1000mf as
designed, it worked fine.
Ray
Don wrote:
>
> The stamp 1 vdd to stamp 2 vdd probably had something to do with it.
> Thats +5 vdc to +5vdc and if one of the vdd pins dropped voltage even
> momentarily, you hit the voltage regulator with reverse 5 volts.
> For serial comms, all you need is the two vss pins connected and one of
> the numbered I/O pins on each stamp connected.
>
> Don
>
Original Message
> From: "raoul vaneigem" <raoul@c...>
> To: <basicstamps@yahoogroups.com>
> Sent: Thursday, May 09, 2002 10:36 PM
> Subject: Re: [noparse][[/noparse]basicstamps] stamp to stamp serial burnout?
>
> > At 10:24 PM 5/9/2002 -0700, you wrote:
> > >Hello,
> > >
> > >I've been trying sending serial data from one stamp to another. I have
> the
> > >transmitting stamp connecting vss to the recieving stamp vss, and vdd to
> > >the receiving stamp vss.
> >
> > sorry, I meant stamp 1 vss > stamp 2 vss, and stamp 1 vdd to stamp 2 vdd
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
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> Body of the message will be ignored.
> >
> >
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> >
> >
> >
>
> To UNSUBSCRIBE, just send mail to:
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>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
> The stamp 1 vdd to stamp 2 vdd probably had something to do with it.
>Thats +5 vdc to +5vdc and if one of the vdd pins dropped voltage even
>momentarily, you hit the voltage regulator with reverse 5 volts.
> For serial comms, all you need is the two vss pins connected and one of
>the numbered I/O pins on each stamp connected.
I don't understand this, as I read in the Microcontroller Application
Cookbook that vdd can supply a regulated +5v, 50ma max for additional
circuitry. As the stamp only draws 10 ma, and I had no pins doing anything
other than sending serial information, why would it be a problem to use vdd?
>-snip- and vdd to the receiving stamp vss. -
>This is either a condition known as a direct short to ground, or what we
>call a tapographical error. But seriously Vdd to Vdd should be ok as long as
>the total loading is not excessive, if it is, try connecting their Vin pins
>together or use an external 5 volt regulator to the Vdd pins. If the sending
>stamp is dead it might be just an internal regulator burn-out in which case
>an external regulator should solve the problem, try 78L05 or if you need
>more current a 78M05 is rated 500ma, still not enough use a 7805.
Thanks for the advice, where to I connect the output of the 7805 to make
the stamp work again? To Vdd?
> By the way, are you using BS2 stamps and the Windows based editor? That
>could be significant.
One stamp powering the other. One stamp on a BOE, powered by the wall
supply, one (the one that burned out) on a carrier board. BS2 with the DOS
version of the editor. I just tested it on my other computer with the
Windows Editor, and it gives me the same error, "stamp found but no power,
etc".
How significant is the risk of static damage?
Also, I was working in a lab with some other people, and right around the
same time my friends stamp stopped working, but his started working again,
could some transient power surge have damaged the stamp that was drawing
power from the plugged in stamp? It was plugged into a power strip so I
didn't think that could have been the problem, but it does seem like a
weird co-incidence.
Thanks!
>Don
>
Original Message
>From: "raoul vaneigem" <raoul@c...>
>To: <basicstamps@yahoogroups.com>
>Sent: Friday, May 10, 2002 9:10 AM
>Subject: Re: [noparse][[/noparse]basicstamps] stamp to stamp serial burnout?
>
>
> > At 06:45 AM 5/10/2002 -0700, you wrote:
> > > The stamp 1 vdd to stamp 2 vdd probably had something to do with it.
> > >Thats +5 vdc to +5vdc and if one of the vdd pins dropped voltage even
> > >momentarily, you hit the voltage regulator with reverse 5 volts.
> > > For serial comms, all you need is the two vss pins connected and one
>of
> > >the numbered I/O pins on each stamp connected.
> >
> > I don't understand this, as I read in the Microcontroller Application
> > Cookbook that vdd can supply a regulated +5v, 50ma max for additional
> > circuitry. As the stamp only draws 10 ma, and I had no pins doing anything
> > other than sending serial information, why would it be a problem to use
>vdd?
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
> >
> >
> >
>
>
>
>To UNSUBSCRIBE, just send mail to:
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If so, connecting VDD to VDD should be fine, assuming there is no other
power connected to the second stamp. I assumed you had standard power
supply (wall transformer or 9V battery) connected to each stamp.
If you are powering one stamp with the other, and not taking any other
current from the second stamp with other circuits, then it should have
worked. If you have met these conditions, then I am not sure why your stamp
burned out.
Don
Original Message
From: "raoul vaneigem" <raoul@c...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, May 10, 2002 9:10 AM
Subject: Re: [noparse][[/noparse]basicstamps] stamp to stamp serial burnout?
> At 06:45 AM 5/10/2002 -0700, you wrote:
> > The stamp 1 vdd to stamp 2 vdd probably had something to do with it.
> >Thats +5 vdc to +5vdc and if one of the vdd pins dropped voltage even
> >momentarily, you hit the voltage regulator with reverse 5 volts.
> > For serial comms, all you need is the two vss pins connected and one
of
> >the numbered I/O pins on each stamp connected.
>
> I don't understand this, as I read in the Microcontroller Application
> Cookbook that vdd can supply a regulated +5v, 50ma max for additional
> circuitry. As the stamp only draws 10 ma, and I had no pins doing anything
> other than sending serial information, why would it be a problem to use
vdd?
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
could be significant.
Don
Original Message
From: "raoul vaneigem" <raoul@c...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, May 10, 2002 9:10 AM
Subject: Re: [noparse][[/noparse]basicstamps] stamp to stamp serial burnout?
> At 06:45 AM 5/10/2002 -0700, you wrote:
> > The stamp 1 vdd to stamp 2 vdd probably had something to do with it.
> >Thats +5 vdc to +5vdc and if one of the vdd pins dropped voltage even
> >momentarily, you hit the voltage regulator with reverse 5 volts.
> > For serial comms, all you need is the two vss pins connected and one
of
> >the numbered I/O pins on each stamp connected.
>
> I don't understand this, as I read in the Microcontroller Application
> Cookbook that vdd can supply a regulated +5v, 50ma max for additional
> circuitry. As the stamp only draws 10 ma, and I had no pins doing anything
> other than sending serial information, why would it be a problem to use
vdd?
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
good odds. I know that with the DOS editors, (I have to use it for my slave
BS1s), it is not unusual to have to unplug the programming cable from the
stamp board and plug it back in one or more times to get it to work. I
don't know exactly why.
I highly doubt it was a transient surge that burned out the
power-receiving stamp. Even if the powerstrip didn't stop a surge, the DC
transformer does not respond linearly to current on the AC side, so it
shouldn't have sent much more than its' rated voltage. Even then, it should
have burned out the stamp connected to the wall first or as well.
Don
Original Message
From: "raoul vaneigem" <raoul@c...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, May 10, 2002 9:49 AM
Subject: Re: [noparse][[/noparse]basicstamps] stamp to stamp serial burnout?
> At 10:25 AM 5/10/2002 -0700, you wrote:
> > By the way, are you using BS2 stamps and the Windows based editor?
That
> >could be significant.
>
> One stamp powering the other. One stamp on a BOE, powered by the wall
> supply, one (the one that burned out) on a carrier board. BS2 with the DOS
> version of the editor. I just tested it on my other computer with the
> Windows Editor, and it gives me the same error, "stamp found but no power,
> etc".
>
> How significant is the risk of static damage?
>
> Also, I was working in a lab with some other people, and right around the
> same time my friends stamp stopped working, but his started working again,
> could some transient power surge have damaged the stamp that was drawing
> power from the plugged in stamp? It was plugged into a power strip so I
> didn't think that could have been the problem, but it does seem like a
> weird co-incidence.
>
> Thanks!
>
> >Don
> >
Original Message
> >From: "raoul vaneigem" <raoul@c...>
> >To: <basicstamps@yahoogroups.com>
> >Sent: Friday, May 10, 2002 9:10 AM
> >Subject: Re: [noparse][[/noparse]basicstamps] stamp to stamp serial burnout?
> >
> >
> > > At 06:45 AM 5/10/2002 -0700, you wrote:
> > > > The stamp 1 vdd to stamp 2 vdd probably had something to do with
it.
> > > >Thats +5 vdc to +5vdc and if one of the vdd pins dropped voltage even
> > > >momentarily, you hit the voltage regulator with reverse 5 volts.
> > > > For serial comms, all you need is the two vss pins connected and
one
> >of
> > > >the numbered I/O pins on each stamp connected.
> > >
> > > I don't understand this, as I read in the Microcontroller Application
> > > Cookbook that vdd can supply a regulated +5v, 50ma max for additional
> > > circuitry. As the stamp only draws 10 ma, and I had no pins doing
anything
> > > other than sending serial information, why would it be a problem to
use
> >vdd?
> > >
> > >
> > >
> > > To UNSUBSCRIBE, just send mail to:
> > > basicstamps-unsubscribe@yahoogroups.com
> > > from the same email address that you subscribed. Text in the Subject
and
> >Body of the message will be ignored.
> > >
> > >
> > > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> > >
> > >
> > >
> >
> >
> >
> >To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> >from the same email address that you subscribed. Text in the Subject and
> >Body of the message will be ignored.
> >
> >
> >Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
on a PC type board. It depends on the strength of the static charge ans
where it went in. I understand the I/O pins can be particularly
susceptable, depending on if they are set for input or output.
Don
Original Message
From: "raoul vaneigem" <raoul@c...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, May 10, 2002 9:49 AM
Subject: Re: [noparse][[/noparse]basicstamps] stamp to stamp serial burnout?
> At 10:25 AM 5/10/2002 -0700, you wrote:
> > By the way, are you using BS2 stamps and the Windows based editor?
That
> >could be significant.
>
> One stamp powering the other. One stamp on a BOE, powered by the wall
> supply, one (the one that burned out) on a carrier board. BS2 with the DOS
> version of the editor. I just tested it on my other computer with the
> Windows Editor, and it gives me the same error, "stamp found but no power,
> etc".
>
> How significant is the risk of static damage?
>
> Also, I was working in a lab with some other people, and right around the
> same time my friends stamp stopped working, but his started working again,
> could some transient power surge have damaged the stamp that was drawing
> power from the plugged in stamp? It was plugged into a power strip so I
> didn't think that could have been the problem, but it does seem like a
> weird co-incidence.
>
> Thanks!
>
> >Don
> >
Original Message
> >From: "raoul vaneigem" <raoul@c...>
> >To: <basicstamps@yahoogroups.com>
> >Sent: Friday, May 10, 2002 9:10 AM
> >Subject: Re: [noparse][[/noparse]basicstamps] stamp to stamp serial burnout?
> >
> >
> > > At 06:45 AM 5/10/2002 -0700, you wrote:
> > > > The stamp 1 vdd to stamp 2 vdd probably had something to do with
it.
> > > >Thats +5 vdc to +5vdc and if one of the vdd pins dropped voltage even
> > > >momentarily, you hit the voltage regulator with reverse 5 volts.
> > > > For serial comms, all you need is the two vss pins connected and
one
> >of
> > > >the numbered I/O pins on each stamp connected.
> > >
> > > I don't understand this, as I read in the Microcontroller Application
> > > Cookbook that vdd can supply a regulated +5v, 50ma max for additional
> > > circuitry. As the stamp only draws 10 ma, and I had no pins doing
anything
> > > other than sending serial information, why would it be a problem to
use
> >vdd?
> > >
> > >
> > >
> > > To UNSUBSCRIBE, just send mail to:
> > > basicstamps-unsubscribe@yahoogroups.com
> > > from the same email address that you subscribed. Text in the Subject
and
> >Body of the message will be ignored.
> > >
> > >
> > > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> > >
> > >
> > >
> >
> >
> >
> >To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> >from the same email address that you subscribed. Text in the Subject and
> >Body of the message will be ignored.
> >
> >
> >Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
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>
>
>
8.4 vdc it worked real good. If any one wants to check out some pics or mpeg
movie of my bot I will send. my e-mail is skip.webb@h... See
Ya Skip
Original Message
From: Don [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=j_VLgdjPrMuvTTh0YL0SwP7ETjrfjbQQf5WHn7y-YHU1tNBk0COHY4QR5mbW-A9dxcFqodeQD8cg1gofEpxEObZL9UTIJg]renegade.engineer@v...[/url
Sent: Friday, May 10, 2002 1:58 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] stamp to stamp serial burnout?
Oh, and as for static damage, it is about the same as any other circuit
on a PC type board. It depends on the strength of the static charge ans
where it went in. I understand the I/O pins can be particularly
susceptable, depending on if they are set for input or output.
Don
Original Message
From: "raoul vaneigem" <raoul@c...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, May 10, 2002 9:49 AM
Subject: Re: [noparse][[/noparse]basicstamps] stamp to stamp serial burnout?
> At 10:25 AM 5/10/2002 -0700, you wrote:
> > By the way, are you using BS2 stamps and the Windows based editor?
That
> >could be significant.
>
> One stamp powering the other. One stamp on a BOE, powered by the wall
> supply, one (the one that burned out) on a carrier board. BS2 with the DOS
> version of the editor. I just tested it on my other computer with the
> Windows Editor, and it gives me the same error, "stamp found but no power,
> etc".
>
> How significant is the risk of static damage?
>
> Also, I was working in a lab with some other people, and right around the
> same time my friends stamp stopped working, but his started working again,
> could some transient power surge have damaged the stamp that was drawing
> power from the plugged in stamp? It was plugged into a power strip so I
> didn't think that could have been the problem, but it does seem like a
> weird co-incidence.
>
> Thanks!
>
> >Don
> >
Original Message
> >From: "raoul vaneigem" <raoul@c...>
> >To: <basicstamps@yahoogroups.com>
> >Sent: Friday, May 10, 2002 9:10 AM
> >Subject: Re: [noparse][[/noparse]basicstamps] stamp to stamp serial burnout?
> >
> >
> > > At 06:45 AM 5/10/2002 -0700, you wrote:
> > > > The stamp 1 vdd to stamp 2 vdd probably had something to do with
it.
> > > >Thats +5 vdc to +5vdc and if one of the vdd pins dropped voltage even
> > > >momentarily, you hit the voltage regulator with reverse 5 volts.
> > > > For serial comms, all you need is the two vss pins connected and
one
> >of
> > > >the numbered I/O pins on each stamp connected.
> > >
> > > I don't understand this, as I read in the Microcontroller Application
> > > Cookbook that vdd can supply a regulated +5v, 50ma max for additional
> > > circuitry. As the stamp only draws 10 ma, and I had no pins doing
anything
> > > other than sending serial information, why would it be a problem to
use
> >vdd?
> > >
> > >
> > >
> > > To UNSUBSCRIBE, just send mail to:
> > > basicstamps-unsubscribe@yahoogroups.com
> > > from the same email address that you subscribed. Text in the Subject
and
> >Body of the message will be ignored.
> > >
> > >
> > > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> > >
> > >
> > >
> >
> >
> >
> >To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> >from the same email address that you subscribed. Text in the Subject and
> >Body of the message will be ignored.
> >
> >
> >Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
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>
>
>
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject and
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Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
From: "raoul vaneigem" <raoul@
> At 08:59 AM 5/10/2002 -0500, you wrote:
> >-snip- and vdd to the receiving stamp vss. -
> >This is either a condition known as a direct short to ground, or what we
> >call a tapographical error. But seriously Vdd to Vdd should be ok as long
as
> >the total loading is not excessive, if it is, try connecting their Vin
pins
> >together or use an external 5 volt regulator to the Vdd pins. If the
sending
> >stamp is dead it might be just an internal regulator burn-out in which
case
> >an external regulator should solve the problem, try 78L05 or if you need
> >more current a 78M05 is rated 500ma, still not enough use a 7805.
>
> Thanks for the advice, where to I connect the output of the 7805 to make
> the stamp work again? To Vdd?
Yes and leave Vin open
KF4HAZ - Lonnie