Wiring problem
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Posts: 46,084
I want the BS2 to trigger a DC12V application. At frist i thought
the answer was with relays but i later found i would have needed a
12V relay with a 1.8V pickup coil which i dont think exists.
However, i consulted one of my friends that knows a lot about
schematics and all that(hes 16 like me though so hes kind of an
unreliable source) and he said i should try using a resistor. He
explained to me that a resistor works just as a relay would. It is
triggered once it has attained a certain voltage going through it.
So, there would be a constant 12V supply going to the battery and
then when the BS2 triggers a pin to send voltage (1.8V i think) it
would take the 12V and add it to the 1.8V creating a voltage of 13.8
he said i should just by a transistor that would be trigger at
something like 13V...Is my friend correct? would this work? if not,
how can i make it work?
the answer was with relays but i later found i would have needed a
12V relay with a 1.8V pickup coil which i dont think exists.
However, i consulted one of my friends that knows a lot about
schematics and all that(hes 16 like me though so hes kind of an
unreliable source) and he said i should try using a resistor. He
explained to me that a resistor works just as a relay would. It is
triggered once it has attained a certain voltage going through it.
So, there would be a constant 12V supply going to the battery and
then when the BS2 triggers a pin to send voltage (1.8V i think) it
would take the 12V and add it to the 1.8V creating a voltage of 13.8
he said i should just by a transistor that would be trigger at
something like 13V...Is my friend correct? would this work? if not,
how can i make it work?
Comments
to control at 12vdc. Then when I know this I will design a ckt. schematic
that will work for you. Skip
Original Message
From: compsci2522003 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=ylOXswy9NZxBAkYi35T9iG3BJbzgbr_TD9Zass130JL7-Q_oNOfGc5M7PhueYzBTEsVk1V0RJgPDYp-_-XzStl0]waseemthedream@h...[/url
Sent: Tuesday, May 14, 2002 1:23 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Wiring problem
I want the BS2 to trigger a DC12V application. At frist i thought
the answer was with relays but i later found i would have needed a
12V relay with a 1.8V pickup coil which i dont think exists.
However, i consulted one of my friends that knows a lot about
schematics and all that(hes 16 like me though so hes kind of an
unreliable source) and he said i should try using a resistor. He
explained to me that a resistor works just as a relay would. It is
triggered once it has attained a certain voltage going through it.
So, there would be a constant 12V supply going to the battery and
then when the BS2 triggers a pin to send voltage (1.8V i think) it
would take the 12V and add it to the 1.8V creating a voltage of 13.8
he said i should just by a transistor that would be trigger at
something like 13V...Is my friend correct? would this work? if not,
how can i make it work?
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transistor, how foolish of me. Perhaps, this post will make more
sense now...And im still working on finding how many amps come out of
12V car battery.
Current is equal to the voltage divided by the resistance of the load.
Example 12v / 12ohm load = 1amp of current. Skip
Original Message
From: compsci2522003 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Q2tqOlgTvDVNLWCasF5ti7GB2IjlvnDh4uiESrUTXuwisAwccd8fE0mAV5_-52Q35M5D1iPOPK0bHGwMQzyReaRBzRwJ]waseemthedream@h...[/url
Sent: Tuesday, May 14, 2002 11:54 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Wiring problem
in the original message i kept using the word resistor instead of
transistor, how foolish of me. Perhaps, this post will make more
sense now...And im still working on finding how many amps come out of
12V car battery.
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>in the original message i kept using the word resistor instead of
>transistor, how foolish of me. Perhaps, this post will make more
>sense now...And im still working on finding how many amps come out of
>12V car battery.
The amount of current flowing from a car battery depends on the resistance
of the circuit it flows through. It's governed by Ohm's law, I = E/R where
I is current, E is voltage, and R is resistance.
A car battery that is short circuited can deliver many hundreds of
amps. Or, if connected properly to power your BS2 Basic Stamp will deliver
perhaps 20 milliamps.
It all depends on the resistance of the circuit.
Jim H
"Stamps In Class" section. They have provided all kinds of information
about interfacing to the real world. Look especially at Industrial
Control experiment #3. It has exactly what you need.
http://www.stampsinclass.com/downloads/Ind Control/ic3.pdf
--- In basicstamps@y..., "compsci2522003" <waseemthedream@h...> wrote:
> I want the BS2 to trigger a DC12V application. At frist i thought
> the answer was with relays but i later found i would have needed a
> 12V relay with a 1.8V pickup coil which i dont think exists.
> However, i consulted one of my friends that knows a lot about
> schematics and all that(hes 16 like me though so hes kind of an
> unreliable source) and he said i should try using a resistor. He
> explained to me that a resistor works just as a relay would. It is
> triggered once it has attained a certain voltage going through it.
> So, there would be a constant 12V supply going to the battery and
> then when the BS2 triggers a pin to send voltage (1.8V i think) it
> would take the 12V and add it to the 1.8V creating a voltage of
13.8
> he said i should just by a transistor that would be trigger at
> something like 13V...Is my friend correct? would this work? if not,
> how can i make it work?