Power Usage
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Posts: 46,084
Hi everyone
I am not new to electronics, but have never really grasped the concept of
power usage of a circuits.
I have a mobile platform controlled by a Stamp2sx with various other modules
on board (eg 2x stepper controllers, ultrasonic, radio modem ect.).
I run each one of a single 9v Dry cell since none of them consume more than
about 100mA.
But this is now where I get lost. I want to run all of them from one power
source. I have lots of rechargeble cellpacks with 2400mAh rating, but I am
worried if I use them I will put too much current through the circuits. In
other words, if my stamp uses 60mA and I connect it to a 2400 source, will
it damage it?
I am not new to electronics, but have never really grasped the concept of
power usage of a circuits.
I have a mobile platform controlled by a Stamp2sx with various other modules
on board (eg 2x stepper controllers, ultrasonic, radio modem ect.).
I run each one of a single 9v Dry cell since none of them consume more than
about 100mA.
But this is now where I get lost. I want to run all of them from one power
source. I have lots of rechargeble cellpacks with 2400mAh rating, but I am
worried if I use them I will put too much current through the circuits. In
other words, if my stamp uses 60mA and I connect it to a 2400 source, will
it damage it?
Comments
Original Message
From: "Okkie Vermeulen" <okkie@i...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, May 22, 2001 12:21 PM
Subject: [noparse][[/noparse]basicstamps] Power Usage
> Hi everyone
>
> I am not new to electronics, but have never really grasped the concept of
> power usage of a circuits.
> I have a mobile platform controlled by a Stamp2sx with various other
modules
> on board (eg 2x stepper controllers, ultrasonic, radio modem ect.).
> I run each one of a single 9v Dry cell since none of them consume more
than
> about 100mA.
> But this is now where I get lost. I want to run all of them from one power
> source. I have lots of rechargeble cellpacks with 2400mAh rating, but I am
> worried if I use them I will put too much current through the circuits. In
> other words, if my stamp uses 60mA and I connect it to a 2400 source, will
> it damage it?
>
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
as long as you don't try and sink more than 30 ma through any one I/O pin or
exceed 100 ma for your total power consumption if your using the external 5
volt regulator.
Original Message
From: "Okkie Vermeulen" <okkie@i...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, May 22, 2001 12:21 PM
Subject: [noparse][[/noparse]basicstamps] Power Usage
> Hi everyone
>
> I am not new to electronics, but have never really grasped the concept of
> power usage of a circuits.
> I have a mobile platform controlled by a Stamp2sx with various other
modules
> on board (eg 2x stepper controllers, ultrasonic, radio modem ect.).
> I run each one of a single 9v Dry cell since none of them consume more
than
> about 100mA.
> But this is now where I get lost. I want to run all of them from one power
> source. I have lots of rechargeble cellpacks with 2400mAh rating, but I am
> worried if I use them I will put too much current through the circuits. In
> other words, if my stamp uses 60mA and I connect it to a 2400 source, will
> it damage it?
>
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
Original Message
From: Ricky Konvicka [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=oboITP7EdxCKviWZOozdNq0nJ17sJ_JLgpfrI-hX9YHQzv2h7ylh75MaICwM5y5KcXqt1XfxIwYuATGL_6tpzg]ricky@m...[/url
Sent: 22 May 2001 18:32
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] Power Usage
Sorry hit the send before I was finished. No It shouldn't damage your stamp
as long as you don't try and sink more than 30 ma through any one I/O pin or
exceed 100 ma for your total power consumption if your using the external 5
volt regulator.
Original Message
From: "Okkie Vermeulen" <okkie@i...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, May 22, 2001 12:21 PM
Subject: [noparse][[/noparse]basicstamps] Power Usage
> Hi everyone
>
> I am not new to electronics, but have never really grasped the concept of
> power usage of a circuits.
> I have a mobile platform controlled by a Stamp2sx with various other
modules
> on board (eg 2x stepper controllers, ultrasonic, radio modem ect.).
> I run each one of a single 9v Dry cell since none of them consume more
than
> about 100mA.
> But this is now where I get lost. I want to run all of them from one power
> source. I have lots of rechargeble cellpacks with 2400mAh rating, but I am
> worried if I use them I will put too much current through the circuits. In
> other words, if my stamp uses 60mA and I connect it to a 2400 source, will
> it damage it?
>
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
I/O pins).
Original Message
From: "Okkie Vermeulen" <okkie@i...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, May 22, 2001 3:06 PM
Subject: RE: [noparse][[/noparse]basicstamps] Power Usage
> What about the +5V on the stamp, how much can it handle?
>
>
>
Original Message
> From: Ricky Konvicka [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=kkMbU5ctK3UIHERj8mk5LHn_LHcTgyqsapiDf7Fg5ym6oodEcN5M2XWKLalCbHrFOpDBULC1lw6MY8yxiCqsQMXXobPH]ricky@m...[/url
> Sent: 22 May 2001 18:32
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] Power Usage
>
>
> Sorry hit the send before I was finished. No It shouldn't damage your
stamp
> as long as you don't try and sink more than 30 ma through any one I/O pin
or
> exceed 100 ma for your total power consumption if your using the external
5
> volt regulator.
>
Original Message
> From: "Okkie Vermeulen" <okkie@i...>
> To: <basicstamps@yahoogroups.com>
> Sent: Tuesday, May 22, 2001 12:21 PM
> Subject: [noparse][[/noparse]basicstamps] Power Usage
>
>
> > Hi everyone
> >
> > I am not new to electronics, but have never really grasped the concept
of
> > power usage of a circuits.
> > I have a mobile platform controlled by a Stamp2sx with various other
> modules
> > on board (eg 2x stepper controllers, ultrasonic, radio modem ect.).
> > I run each one of a single 9v Dry cell since none of them consume more
> than
> > about 100mA.
> > But this is now where I get lost. I want to run all of them from one
power
> > source. I have lots of rechargeble cellpacks with 2400mAh rating, but I
am
> > worried if I use them I will put too much current through the circuits.
In
> > other words, if my stamp uses 60mA and I connect it to a 2400 source,
will
> > it damage it?
> >
> >
> >
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
> >
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
take what it needs. The 2400mAH rating only indicates how long the
battery will last at any given load current.
It does matter what the source voltage is. You didn't say what voltage
the 2400mAH pack will provide. This must be no greater than the
regulators or other circuits can deal with.
In the case of the Stamp on board regulator, it depends on the
particular model of Stamp. Some are limited to 15v maximum, others
higher to 40 volts.
Another consideration if you are using the on board +5 volt regulated
output for auxiliary circuits: The higher the input voltage to the
regulator, the less total current you can use from the +5v regulator
output because of the power (voltage in minus voltage out times
current) that must be dissipated in the regulator.
For example, the BS1-1C regulator is limited to 50mA with a 9v source,
40mA with a 12v source, 10mA with a 25v source, and 2-3mA with a 40v
source (page 10 of Basic Stamp Manual v1.8 by Parallax). But if your
auxiliary circuits are powered directly from the battery (not from the
Stamp +5v regulator), then those loads don't enter into this
discussion.
If you are already powering everything from individual 9 volt
batteries, then you should have no problem powering them all from a
single 9 volt higher capacity source.
Dick Ballard
ballardr@a...
On Tue, 22 May 2001 18:21:58 +0100, you wrote:
>I am not new to electronics, but have never really grasped the concept of
>power usage of a circuits.
>I have a mobile platform controlled by a Stamp2sx with various other modules
>on board (eg 2x stepper controllers, ultrasonic, radio modem ect.).
>I run each one of a single 9v Dry cell since none of them consume more than
>about 100mA.
>But this is now where I get lost. I want to run all of them from one power
>source. I have lots of rechargeble cellpacks with 2400mAh rating, but I am
>worried if I use them I will put too much current through the circuits. In
>other words, if my stamp uses 60mA and I connect it to a 2400 source, will
>it damage it?
What I am gonna try to do now is to use make up a NiCD rechargable pack of
about 9.6V and build a circuit to provide 2 outputs (5V ,9V) and use this
then to power all the modules. That way I can safeguard the Stamps inbuild
regulator.
Original Message
From: Dick Ballard [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=IllMB04AD-UjL9TXzLeMRq_wj_jeX5D8WQGy296f5O4I_zpOyNhT20pQWBhfP7VV9w0pxmM1pPA]ballardr@a...[/url
Sent: 23 May 2001 00:02
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Power Usage
It doesn't matter how much current is available - the load will only
take what it needs. The 2400mAH rating only indicates how long the
battery will last at any given load current.
It does matter what the source voltage is. You didn't say what voltage
the 2400mAH pack will provide. This must be no greater than the
regulators or other circuits can deal with.
In the case of the Stamp on board regulator, it depends on the
particular model of Stamp. Some are limited to 15v maximum, others
higher to 40 volts.
Another consideration if you are using the on board +5 volt regulated
output for auxiliary circuits: The higher the input voltage to the
regulator, the less total current you can use from the +5v regulator
output because of the power (voltage in minus voltage out times
current) that must be dissipated in the regulator.
For example, the BS1-1C regulator is limited to 50mA with a 9v source,
40mA with a 12v source, 10mA with a 25v source, and 2-3mA with a 40v
source (page 10 of Basic Stamp Manual v1.8 by Parallax). But if your
auxiliary circuits are powered directly from the battery (not from the
Stamp +5v regulator), then those loads don't enter into this
discussion.
If you are already powering everything from individual 9 volt
batteries, then you should have no problem powering them all from a
single 9 volt higher capacity source.
Dick Ballard
ballardr@a...
On Tue, 22 May 2001 18:21:58 +0100, you wrote:
>I am not new to electronics, but have never really grasped the concept of
>power usage of a circuits.
>I have a mobile platform controlled by a Stamp2sx with various other
modules
>on board (eg 2x stepper controllers, ultrasonic, radio modem ect.).
>I run each one of a single 9v Dry cell since none of them consume more than
>about 100mA.
>But this is now where I get lost. I want to run all of them from one power
>source. I have lots of rechargeble cellpacks with 2400mAh rating, but I am
>worried if I use them I will put too much current through the circuits. In
>other words, if my stamp uses 60mA and I connect it to a 2400 source, will
>it damage it?
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/