serial connection capacitors
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Posts: 46,084
Hi Stewart,
These capacitors prevent your stamp from resetting
when using a terminal program that keeps the DTR line high.
regards peter
Oorspronkelijk bericht
Van: Stewart Mayer [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=FL3IhYIaXK76Cg5sw6Y7qpyCBeikl8fOKKgqnIInY1R5gcPFNg79AK9XyZIUyXWP9wGogH0fHCIP_eIrQPeHj2f4uYpe]stewlist@k...[/url
Verzonden: zaterdag 29 september 2001 14:57
Aan: basicstamps@yahoogroups.com
Onderwerp: [noparse][[/noparse]basicstamps] serial connection capacitors
Quick question, I'm making my own circuit board and including a serial
connection for programming using pins 1-4 (BS 2p) just like the manual says.
The board of education I have looks similar in connection, but there are
two small capacitors between pin 3 (ATN) and ground and between pin 3 and
the DB-9 connector. Is it necessary to incorporate these capacitors into my
design, what do they do?
Thanks,
Stewart
Original Message
From: basicstamps@yahoogroups.com
Date: Friday, September 28, 2001 11:45:49 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] Re: Power Supply
Thanks for the help phil. Hooking up the 7805 to pin 21 should do the trick
Stewart
Original Message
From: basicstamps@yahoogroups.com
Date: Friday, September 28, 2001 03:02:17 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Power Supply
Stewart,
There are two possible ways to provide power to the Stamp.
1) An external 7805 type regulator with the output connected to the
Vdd pin (Pin 21 on the BS2)
2) Provide 5.5 to 12v (7.5v recommended) to the Vin (pin24 on the
BS2). In this case the Vdd pin (pin 21) is able to provide a limited
amount (I do not recall the limit) of current to other devices.
A diode should be sufficient for polarity protection but don't
forget that in the forward direction, depending on the current and
type, you may drop up to 1v across the diode.
Phil
--- In basicstamps@y..., Stewart Mayer <stewlist@k...> wrote:
> Hello,
>
> In my project, i have several devices that require +5v so I'm using
a 7805
> type regulator with a couple of capacitors. Will the stamp run off
of +5
> volts from the regulator or does the on board regulator require
higher
> voltage to make its own +5 volts? I'm running this off of a
battery that
> may change from 9 to 18 volts so I'd rather use the external
regulator that
> can handle a higher voltage input. I'm thinking that it would be
safer too
> because hooking that little stamp directly to a motorcycle battery
makes me
> nervous.
>
> Also, for polarity protection (in case someone accidentally gets
the battery
> polarity wrong), will a diode in line with the battery be sufficient
> protection?
>
> Thanks,
> Stewart
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
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These capacitors prevent your stamp from resetting
when using a terminal program that keeps the DTR line high.
regards peter
Oorspronkelijk bericht
Van: Stewart Mayer [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=FL3IhYIaXK76Cg5sw6Y7qpyCBeikl8fOKKgqnIInY1R5gcPFNg79AK9XyZIUyXWP9wGogH0fHCIP_eIrQPeHj2f4uYpe]stewlist@k...[/url
Verzonden: zaterdag 29 september 2001 14:57
Aan: basicstamps@yahoogroups.com
Onderwerp: [noparse][[/noparse]basicstamps] serial connection capacitors
Quick question, I'm making my own circuit board and including a serial
connection for programming using pins 1-4 (BS 2p) just like the manual says.
The board of education I have looks similar in connection, but there are
two small capacitors between pin 3 (ATN) and ground and between pin 3 and
the DB-9 connector. Is it necessary to incorporate these capacitors into my
design, what do they do?
Thanks,
Stewart
Original Message
From: basicstamps@yahoogroups.com
Date: Friday, September 28, 2001 11:45:49 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] Re: Power Supply
Thanks for the help phil. Hooking up the 7805 to pin 21 should do the trick
Stewart
Original Message
From: basicstamps@yahoogroups.com
Date: Friday, September 28, 2001 03:02:17 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Power Supply
Stewart,
There are two possible ways to provide power to the Stamp.
1) An external 7805 type regulator with the output connected to the
Vdd pin (Pin 21 on the BS2)
2) Provide 5.5 to 12v (7.5v recommended) to the Vin (pin24 on the
BS2). In this case the Vdd pin (pin 21) is able to provide a limited
amount (I do not recall the limit) of current to other devices.
A diode should be sufficient for polarity protection but don't
forget that in the forward direction, depending on the current and
type, you may drop up to 1v across the diode.
Phil
--- In basicstamps@y..., Stewart Mayer <stewlist@k...> wrote:
> Hello,
>
> In my project, i have several devices that require +5v so I'm using
a 7805
> type regulator with a couple of capacitors. Will the stamp run off
of +5
> volts from the regulator or does the on board regulator require
higher
> voltage to make its own +5 volts? I'm running this off of a
battery that
> may change from 9 to 18 volts so I'd rather use the external
regulator that
> can handle a higher voltage input. I'm thinking that it would be
safer too
> because hooking that little stamp directly to a motorcycle battery
makes me
> nervous.
>
> Also, for polarity protection (in case someone accidentally gets
the battery
> polarity wrong), will a diode in line with the battery be sufficient
> protection?
>
> Thanks,
> Stewart
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
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Comments
connection for programming using pins 1-4 (BS 2p) just like the manual says.
The board of education I have looks similar in connection, but there are
two small capacitors between pin 3 (ATN) and ground and between pin 3 and
the DB-9 connector. Is it necessary to incorporate these capacitors into my
design, what do they do?
Thanks,
Stewart
Original Message
From: basicstamps@yahoogroups.com
Date: Friday, September 28, 2001 11:45:49 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] Re: Power Supply
Thanks for the help phil. Hooking up the 7805 to pin 21 should do the trick
Stewart
Original Message
From: basicstamps@yahoogroups.com
Date: Friday, September 28, 2001 03:02:17 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Power Supply
Stewart,
There are two possible ways to provide power to the Stamp.
1) An external 7805 type regulator with the output connected to the
Vdd pin (Pin 21 on the BS2)
2) Provide 5.5 to 12v (7.5v recommended) to the Vin (pin24 on the
BS2). In this case the Vdd pin (pin 21) is able to provide a limited
amount (I do not recall the limit) of current to other devices.
A diode should be sufficient for polarity protection but don't
forget that in the forward direction, depending on the current and
type, you may drop up to 1v across the diode.
Phil
--- In basicstamps@y..., Stewart Mayer <stewlist@k...> wrote:
> Hello,
>
> In my project, i have several devices that require +5v so I'm using
a 7805
> type regulator with a couple of capacitors. Will the stamp run off
of +5
> volts from the regulator or does the on board regulator require
higher
> voltage to make its own +5 volts? I'm running this off of a
battery that
> may change from 9 to 18 volts so I'd rather use the external
regulator that
> can handle a higher voltage input. I'm thinking that it would be
safer too
> because hooking that little stamp directly to a motorcycle battery
makes me
> nervous.
>
> Also, for polarity protection (in case someone accidentally gets
the battery
> polarity wrong), will a diode in line with the battery be sufficient
> protection?
>
> Thanks,
> Stewart
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
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[noparse][[/noparse]Non-text portions of this message have been removed]
m making. Any idea what value they have? I've already got some 1uf, 0.1uf,
and 15pf tantalum caps, would any of these work?
Thanks,
Stewart
Original Message
From: basicstamps@yahoogroups.com
Date: Saturday, September 29, 2001 08:56:59 AM
To: basicstamps@yahoogroups.com
Subject: RE: [noparse][[/noparse]basicstamps] serial connection capacitors
Hi Stewart,
These capacitors prevent your stamp from resetting
when using a terminal program that keeps the DTR line high.
regards peter
Oorspronkelijk bericht
Van: Stewart Mayer [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=7Doa9db2l6IOFyMvNbwmMPIMP-W-1rzmlYvHbZz9gFXadHnPQ06yapuI6BSSiNmnUthwXOyDpAsvHjSdhVYU_Q]stewlist@k...[/url
Verzonden: zaterdag 29 september 2001 14:57
Aan: basicstamps@yahoogroups.com
Onderwerp: [noparse][[/noparse]basicstamps] serial connection capacitors
Quick question, I'm making my own circuit board and including a serial
connection for programming using pins 1-4 (BS 2p) just like the manual says.
The board of education I have looks similar in connection, but there are
two small capacitors between pin 3 (ATN) and ground and between pin 3 and
the DB-9 connector. Is it necessary to incorporate these capacitors into my
design, what do they do?
Thanks,
Stewart
Original Message
From: basicstamps@yahoogroups.com
Date: Friday, September 28, 2001 11:45:49 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] Re: Power Supply
Thanks for the help phil. Hooking up the 7805 to pin 21 should do the trick
Stewart
Original Message
From: basicstamps@yahoogroups.com
Date: Friday, September 28, 2001 03:02:17 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Power Supply
Stewart,
There are two possible ways to provide power to the Stamp.
1) An external 7805 type regulator with the output connected to the
Vdd pin (Pin 21 on the BS2)
2) Provide 5.5 to 12v (7.5v recommended) to the Vin (pin24 on the
BS2). In this case the Vdd pin (pin 21) is able to provide a limited
amount (I do not recall the limit) of current to other devices.
A diode should be sufficient for polarity protection but don't
forget that in the forward direction, depending on the current and
type, you may drop up to 1v across the diode.
Phil
--- In basicstamps@y..., Stewart Mayer <stewlist@k...> wrote:
> Hello,
>
> In my project, i have several devices that require +5v so I'm using
a 7805
> type regulator with a couple of capacitors. Will the stamp run off
of +5
> volts from the regulator or does the on board regulator require
higher
> voltage to make its own +5 volts? I'm running this off of a
battery that
> may change from 9 to 18 volts so I'd rather use the external
regulator that
> can handle a higher voltage input. I'm thinking that it would be
safer too
> because hooking that little stamp directly to a motorcycle battery
makes me
> nervous.
>
> Also, for polarity protection (in case someone accidentally gets
the battery
> polarity wrong), will a diode in line with the battery be sufficient
> protection?
>
> Thanks,
> Stewart
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
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[noparse][[/noparse]Non-text portions of this message have been removed]
I believe 0.1uF value will suffice,
I would however use non-polarized capacitors
rather than tantalum.
regards peter
Oorspronkelijk bericht
Van: Stewart Mayer [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=CIjmqKen3FikaDcDkdYe_Xv9gdbPTwxrEPQpPutffcDxHmxgxxfcjLC6AU6mZKeVE0VcURcPUAmhixxQzjpNWeWNAS6g]stewlist@k...[/url
Verzonden: zaterdag 29 september 2001 16:05
Aan: basicstamps@yahoogroups.com
Onderwerp: RE: [noparse][[/noparse]basicstamps] serial connection capacitors
Thanks for the quick response. I'll probably include them into the board I
m making. Any idea what value they have? I've already got some 1uf, 0.1uf,
and 15pf tantalum caps, would any of these work?
Thanks,
Stewart
Original Message
From: basicstamps@yahoogroups.com
Date: Saturday, September 29, 2001 08:56:59 AM
To: basicstamps@yahoogroups.com
Subject: RE: [noparse][[/noparse]basicstamps] serial connection capacitors
Hi Stewart,
These capacitors prevent your stamp from resetting
when using a terminal program that keeps the DTR line high.
regards peter
Oorspronkelijk bericht
Van: Stewart Mayer [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=CIjmqKen3FikaDcDkdYe_Xv9gdbPTwxrEPQpPutffcDxHmxgxxfcjLC6AU6mZKeVE0VcURcPUAmhixxQzjpNWeWNAS6g]stewlist@k...[/url
Verzonden: zaterdag 29 september 2001 14:57
Aan: basicstamps@yahoogroups.com
Onderwerp: [noparse][[/noparse]basicstamps] serial connection capacitors
Quick question, I'm making my own circuit board and including a serial
connection for programming using pins 1-4 (BS 2p) just like the manual says.
The board of education I have looks similar in connection, but there are
two small capacitors between pin 3 (ATN) and ground and between pin 3 and
the DB-9 connector. Is it necessary to incorporate these capacitors into my
design, what do they do?
Thanks,
Stewart
Original Message
From: basicstamps@yahoogroups.com
Date: Friday, September 28, 2001 11:45:49 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] Re: Power Supply
Thanks for the help phil. Hooking up the 7805 to pin 21 should do the trick
Stewart
Original Message
From: basicstamps@yahoogroups.com
Date: Friday, September 28, 2001 03:02:17 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Power Supply
Stewart,
There are two possible ways to provide power to the Stamp.
1) An external 7805 type regulator with the output connected to the
Vdd pin (Pin 21 on the BS2)
2) Provide 5.5 to 12v (7.5v recommended) to the Vin (pin24 on the
BS2). In this case the Vdd pin (pin 21) is able to provide a limited
amount (I do not recall the limit) of current to other devices.
A diode should be sufficient for polarity protection but don't
forget that in the forward direction, depending on the current and
type, you may drop up to 1v across the diode.
Phil
--- In basicstamps@y..., Stewart Mayer <stewlist@k...> wrote:
> Hello,
>
> In my project, i have several devices that require +5v so I'm using
a 7805
> type regulator with a couple of capacitors. Will the stamp run off
of +5
> volts from the regulator or does the on board regulator require
higher
> voltage to make its own +5 volts? I'm running this off of a
battery that
> may change from 9 to 18 volts so I'd rather use the external
regulator that
> can handle a higher voltage input. I'm thinking that it would be
safer too
> because hooking that little stamp directly to a motorcycle battery
makes me
> nervous.
>
> Also, for polarity protection (in case someone accidentally gets
the battery
> polarity wrong), will a diode in line with the battery be sufficient
> protection?
>
> Thanks,
> Stewart
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
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