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How do I create a system to control external devices in a language C #
like lamps and small cars and LED`s
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First you need to decide how you would like those devices to communicate with your hardware. There are many options: BlueTooth, USB, Ethernet, parallel port, serial port, GSM, Zigbee, WiFi, GPIO, etc.

Then you'll need an interface board, which put simply has one of the above interfaces at one end and transistor (SCR, TRIAC, MOSFET, etc.) or relay contacts at the other end, depending on the type and size of the electrical load.

Once you have made that decision, chances are that someone else (probably here at CodeProject) has already done the messy work for you, so search here for available components.
 
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