I bought the FEZ Relay (single) together with my Fez Domino, but I seem to be having a hard time understanding the FEZ relay brochure to make the necessary connections.
[quote]Relay has 3 pins that can be connected to the electrical device as
a switch,C (Common pin), NC (Normally closed) and NO (Normally
open) pins.[/quote]
and…
[quote]“IN” will be the common pin and “OUT1” and “OUT2” are the
normally open and normally closed.[/quote]
Based on this statement, I assume that “IN” = [italic]Common Pin[/italic], “OUT1” = [italic]Normally Open Pin[/italic] and “OUT2” = [italic]Normally Closed Pin[/italic]. However there is another pin labelled “NC” on the relay, which is the fourth pin. Does “NC” mean [italic]Normally Closed[/italic]? If then, what is “OUT2” pin? :o
Say I wanted to make a remote weather station that returns it’s data every 30 minutes. To have all the sensors running all the time would be a waste to battery life, since I only need to sample twice an hour.
Could you use one of these relays to disconnect the current to the sensor when not needed, and the turn it on when needed, perhaps a minute or so prior?
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Granted the draw for these sensors may be very small and a battery may last for a while anyways, but this the best example I could think of at the moment.
This relay is used to power high voltage devices. e.g. FEZ Relay component is rated at 250 Volts 10Amps, so generally it will be able to switch electrical devices which are rated below this maximum.
For lower voltage, transistors can be used as switches. i.e. NPN transistors = [italic]Normally Open[/italic] (Off on LOW) and PNP transistors = [italic]Normally Closed[/italic] (On on LOW).