on off a device via computer

[kashifsohail]

dear gurus i wish to make an on/off switch which can be operated via PC
plz let me know how can i do this magic

thanks

Kashif

 

[bogdanfirst]

well, u would need a relay, a transistor, 2 resistors, a led, a doide and some proframming.....
all u need is to conect it to the printer port and send a data to it,
it has 8bit output, so u can make a simple 8 relay board, 8 switches ...
but if u only need one, just make a simle amp for the relay and make sure of the conections.....
that's why i recommend u a little bit mmore complicated switch, so it will be totaly safe for the computer....
about the programming, u could use c, basic, pascal, bisual c, visual basic, etc....
most of them work......

 

[kashifsohail]

any url

dear fellows can any body point me to some practical link to accomplish the said job

thanks

Kashif Sohail

 

[bogdanfirst]

here's something....
http://ourworld.compuserve.com/homepages/Bill_Bowden/page6.htm

 

[bogdanfirst]

and aonther thing......
but note....they are made for more than one relay.but u can use unly one...
http://www.electro-tech-online.com/custompdfs/2002/12/ck1601.pdf