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== Switch Basics == | == Switch Basics == | ||
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A switch is often to turn something on or off. In the simplest case it is just a wire that is connected or not. Unplugging an appliance is one way to switch it off. A switch is usually a mechanical device where some sort of handle connects or disconnects conductors inside the switch. Another way of thinking of a switch is that it is like a resistor that sometimes has infinite resistance and sometimes has 0 resistance. A computer keyboard is made of a large number of switches. Some switches stay in the on or off position, others only stay on or off while you switch them, these are called momentary switches. A light switch is normally not momentary, a doorbell switch normally is momentary. | A switch is often to turn something on or off. In the simplest case it is just a wire that is connected or not. Unplugging an appliance is one way to switch it off. A switch is usually a mechanical device where some sort of handle connects or disconnects conductors inside the switch. Another way of thinking of a switch is that it is like a resistor that sometimes has infinite resistance and sometimes has 0 resistance. A computer keyboard is made of a large number of switches. Some switches stay in the on or off position, others only stay on or off while you switch them, these are called momentary switches. A light switch is normally not momentary, a doorbell switch normally is momentary. | ||
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*[http://en.wikipedia.org/wiki/Electrical_switch Switch From Wikipedia,the free encyclopedia ( inc. Schematic and Picture )] | *[http://en.wikipedia.org/wiki/Electrical_switch Switch From Wikipedia,the free encyclopedia ( inc. Schematic and Picture )] | ||
*[http://www.kpsec.freeuk.com/components/switch.htm Switches] | *[http://www.kpsec.freeuk.com/components/switch.htm Switches] | ||
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== Relays == | == Relays == | ||
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A [[relay]] is a switch that is turned on and off by an electro-magnet. (So-called "solid state relays" do not use an electro-magnet ). Like other switching devices it allows a small amount of power to control a large amount of power. A nice feature of relays is that there is no electrical connection between the control circuit and the circuit connected to the switch. ( this is called electrical isolation ). They are often used to let low power digital circuits control normal 110v power in a home. | A [[relay]] is a switch that is turned on and off by an electro-magnet. (So-called "solid state relays" do not use an electro-magnet ). Like other switching devices it allows a small amount of power to control a large amount of power. A nice feature of relays is that there is no electrical connection between the control circuit and the circuit connected to the switch. ( this is called electrical isolation ). They are often used to let low power digital circuits control normal 110v power in a home. | ||
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Links | Links | ||
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*[http://en.wikipedia.org/wiki/Relay Relay From Wikipedia, the free encyclopedia] | *[http://en.wikipedia.org/wiki/Relay Relay From Wikipedia, the free encyclopedia] | ||
*[http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=119 Controlling Big, Mean, Devices] | *[http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=119 Controlling Big, Mean, Devices] | ||
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| − | + | == needs cleanup == | |
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| + | [[Switch Terminology]] _P_T - SPST - SPDT - DPST - DPDT - 3PDT - .... | ||
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| + | [[Image:Main-G5Q-14.jpg|69px|Relays]] [[Relays]] - Use these to control large power sources that a microcontroller cannot do alone | ||
[[Category:Components]] | [[Category:Components]] | ||
