Difference between revisions of "Switches"
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| + | == Switch Basics == | ||
| + | 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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| + | Uses: | ||
| + | *On Off control | ||
| + | *Range change, as in a meter | ||
| + | *Data input | ||
| + | |||
| + | Links | ||
| + | *[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] | ||
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| + | == Relays == | ||
| + | |||
| + | == needs cleanup == | ||
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varc4tb | varc4tb | ||
[[Switch Terminology]] _P_T - SPST - SPDT - DPST - DPDT - 3PDT - .... | [[Switch Terminology]] _P_T - SPST - SPDT - DPST - DPDT - 3PDT - .... | ||
Revision as of 14:23, 7 February 2008
Switch Basics
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.
Uses:
- On Off control
- Range change, as in a meter
- Data input
Links
Relays
needs cleanup
varc4tb Switch Terminology _P_T - SPST - SPDT - DPST - DPDT - 3PDT - ....
Relays - Use these to control large power sources that a microcontroller cannot do alone
