Relay''s
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Posts: 46,084
> I've only just started playing around with this stuff and i'm
> confused about how to hook up a 12v relay, its got 8 pins, 2 of which are
> seperated from the rest, i was able to pull up the schematics online but i
> have no idea how to hook this up. If required i can take a pic of it and
> post it.
2 pins at one end are the coil (you can measure a resistance
between them). The other 6 are contacts and can vary in
arrangement. Often, the middle set are the common pole and one
side is Normall Open (NO) and the other is Normally Closed (NC).
When you energize the coil, the relay will pull-in the contacts and
the NC contacts will open and the NO contact will close.
Please note that the MAX current for a Stamp pin is 20 mA source,
25 mA sink and most relays (even the small ones) can easily
exceed that. In other words do NOT connect the coil of the relay
directly to a Stamp pin. You should also use a protection diode
(reverse-polarized) across the coil to prevent sureges from
damaging the Stamp pin when the magnetic field in the coil
collapses.
Mark Hillier, VE6HVW
President, HVW Technologies Inc.
Canadian Distributors of Parallax Products and other Neat Stuff
Tel: +403-730-8603 Fax: +403-730-8903
See our NEW BASIC Stamp Prototyping tools !
http://www.hvwtech.com/stampstack.htm
> confused about how to hook up a 12v relay, its got 8 pins, 2 of which are
> seperated from the rest, i was able to pull up the schematics online but i
> have no idea how to hook this up. If required i can take a pic of it and
> post it.
2 pins at one end are the coil (you can measure a resistance
between them). The other 6 are contacts and can vary in
arrangement. Often, the middle set are the common pole and one
side is Normall Open (NO) and the other is Normally Closed (NC).
When you energize the coil, the relay will pull-in the contacts and
the NC contacts will open and the NO contact will close.
Please note that the MAX current for a Stamp pin is 20 mA source,
25 mA sink and most relays (even the small ones) can easily
exceed that. In other words do NOT connect the coil of the relay
directly to a Stamp pin. You should also use a protection diode
(reverse-polarized) across the coil to prevent sureges from
damaging the Stamp pin when the magnetic field in the coil
collapses.
Mark Hillier, VE6HVW
President, HVW Technologies Inc.
Canadian Distributors of Parallax Products and other Neat Stuff
Tel: +403-730-8603 Fax: +403-730-8903
See our NEW BASIC Stamp Prototyping tools !
http://www.hvwtech.com/stampstack.htm