| Author |
Message |
ryadav
Guest
|
 Posted:
Mon Dec 12, 2005 12:02 am Post subject:
control the electrical appliances using PC |
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|
Hi,
I used the Circuit Diagram mentioned in the below link to "control the
electrical appliances using PC". But it does not work. Did any one
worked recently on this, if yes does it works?
http://www.ibiblio.org/pub/Linux/docs/HOWTO/Home-Electrical-Control
I used the following components
1. 6 VDC Relay
2. C2235 NPN transistor
3. 1N4007 diode
4. 4.7 K resisitor
5. LED
Only LED glows when parallel port passes +5v. As it is metioned in the
link relays switches
when parallel port passes +5v which is not happening in my case. Please
help me in fixing issue. Relay switch is happening in before parallel
port passes +5v.
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ryadav
Guest
|
| Posted:
Mon Dec 12, 2005 12:26 am Post subject:
Re: control the electrical appliances using PC |
|
|
what is the wrong in the circuit? why it does not work?
| Vcc for Relay
|
|
/ -------+--------| |---------|
P data 4.7K B / c | 1N4002 |_|
|-------
-----------/\/\/\/\---------+-----| NPN _____ | relay |home
device
| \ e /_\ |-|
|-------
LED X \ +--------| |---------|
P Ground | | |
----------------------------+-------+--------+
Relay Ground |
---------------------------------------------+ |
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ryadav
Guest
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| Posted:
Mon Dec 12, 2005 12:30 am Post subject:
Re: control the electrical appliances using PC |
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Relay will be always glows since diagram shows relay VCC is passed to
cathod end of diode and relay ground given to anode end of
diode. should it be like that?
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cbm5
Guest
|
| Posted:
Mon Dec 12, 2005 12:32 am Post subject:
Re: control the electrical appliances using PC |
|
|
ryadav wrote:
| Quote: | Hi,
I used the Circuit Diagram mentioned in the below link to "control the
electrical appliances using PC". But it does not work. Did any one
worked recently on this, if yes does it works?
http://www.ibiblio.org/pub/Linux/docs/HOWTO/Home-Electrical-Control
I used the following components
1. 6 VDC Relay
2. C2235 NPN transistor
3. 1N4007 diode
4. 4.7 K resisitor
5. LED
Only LED glows when parallel port passes +5v. As it is metioned in the
link relays switches
when parallel port passes +5v which is not happening in my case. Please
help me in fixing issue. Relay switch is happening in before parallel
port passes +5v.
|
The circuit is wrong, use the one from
http://www.epanorama.net/circuits/parallel_output.html#relaycontrol |
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Pooh Bear
Guest
|
| Posted:
Mon Dec 12, 2005 1:35 am Post subject:
Re: control the electrical appliances using PC |
|
|
ryadav wrote:
| Quote: | Hi,
I used the Circuit Diagram mentioned in the below link to "control the
electrical appliances using PC". But it does not work. Did any one
worked recently on this, if yes does it works?
|
cbm5 is correct.
The circuit you posted is wrong. The relay should be in series with the
transistor not in parallel. Use the link he supplied.
Graham |
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Pooh Bear
Guest
|
| Posted:
Mon Dec 12, 2005 1:35 am Post subject:
Re: control the electrical appliances using PC |
|
|
ryadav wrote:
| Quote: | what is the wrong in the circuit? why it does not work?
|
That circuit is defective.
The base-emitter junction forward voltage should never exceed about 0.7V.
That's not enough to light the LED which is therefore spurious. You say the
LED lights which suggests that you miswired the transistor.
Graham |
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Pooh Bear
Guest
|
| Posted:
Mon Dec 12, 2005 1:35 am Post subject:
Re: control the electrical appliances using PC |
|
|
ryadav wrote:
| Quote: | Relay will be always glows since diagram shows relay VCC is passed to
cathod end of diode and relay ground given to anode end of
diode. should it be like that?
|
The diode is there to 'catch' the flyback pulse when the relay switches
off ( inductive parts have stored energy ). It's shown connected
correctly.
Graham |
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Jasen Betts
Guest
|
| Posted:
Mon Dec 12, 2005 9:35 am Post subject:
Re: control the electrical appliances using PC |
|
|
On 2005-12-11, ryadav <raghuyadav77@gmail.com> wrote:
that circuit in that document is bullshit, try the coffee howto instead
http://www.ibiblio.org/pub/Linux/docs/HOWTO/Coffee.html
It gives this circuit which is very conventional.
you ca probably make it work with the parts you have.
Vcc
|
+------+
| __|__
Relay /^\ Diode 1N4002
Coil /---\
| |
+------+
|
| /
4.7K B |/ C
parallel port >-\/\/\/\/---| NPN Transistor: BC547A or 2N2222A
data pi |\ E
| \
V
parallel port >--------------+
ground pin |
I'm submitting a bug report on the Home-Electrical-Control document.
Bye.
Jasen |
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Jasen Betts
Guest
|
| Posted:
Mon Dec 12, 2005 9:35 am Post subject:
Re: control the electrical appliances using PC |
|
|
On 2005-12-11, ryadav <raghuyadav77@gmail.com> wrote:
| Quote: | Hi,
I used the Circuit Diagram mentioned in the below link to "control the
electrical appliances using PC". But it does not work. Did any one
worked recently on this, if yes does it works?
http://www.ibiblio.org/pub/Linux/docs/HOWTO/Home-Electrical-Control
I used the following components
1. 6 VDC Relay
2. C2235 NPN transistor
3. 1N4007 diode
4. 4.7 K resisitor
5. LED
Only LED glows when parallel port passes +5v. As it is metioned in the
link relays switches
when parallel port passes +5v which is not happening in my case. Please
help me in fixing issue. Relay switch is happening in before parallel
port passes +5v.
|
it needs extra power for the relay. pin 1 of the joystick socket has 5V
which might be anough, otherwise use a 6V plugpack.
Bye.
Jasen |
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Bob Masta
Guest
|
| Posted:
Mon Dec 12, 2005 5:35 pm Post subject:
Re: control the electrical appliances using PC |
|
|
On 11 Dec 2005 10:02:52 -0800, "ryadav" <raghuyadav77@gmail.com>
wrote:
| Quote: | Hi,
I used the Circuit Diagram mentioned in the below link to "control the
electrical appliances using PC". But it does not work. Did any one
worked recently on this, if yes does it works?
|
In addition to what others have posted, note that NT-based
versions of Windows (NT, XP, 2000) don't allow direct access
to the ports, so you will probably need a special ring 0 driver like
GIVEIO for them. That won't be needed for Win9x and earlier.
Best regards,
Bob Masta
dqatechATdaqartaDOTcom
D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Home of DaqGen, the FREEWARE signal generator |
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neon
Joined: 25 Feb 2006
Posts: 586
|
| Posted:
Sat Feb 25, 2006 2:38 pm Post subject:
|
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| stupid using a $500 PC to control A STEM IRON. get a life |
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