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Electrical control theory to explain the use of computers

2014-11-23 07:31  
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This article is to explain the principles of using a computer controlled appliances. The combination of text read schematics would be more effective to grasp this principle. This is a circuit  using the printer port of a computer for control application using software and some interface hardware. Interface circuit and software can be given to any PC using the printer port control 8 devices. The interface circuit is shown plotted in Figure only one device, the control bits of the pin 25 pin parallel port 2 D0. The same circuit as the rest of the data bits through D7 D1 (available in pin 3-9) must be the same connection. Isolated using optocouplers ensure complete PC from the relay driver circuit. There are many ways to achieve control hardware using the software. In C / C ? One can use outportb (portno, value) function, portno is the parallel port address (usually 378 hexadecimal LPT1) and 'value' is the data to be sent to the port. Value = 0 all the outputs (D0-D7) out. Value = 1 D0, value = 2 D1, D2 value = 4, in so forth. Such as. If the value = 29 (decimal) =??? 00011101 (binary)?? -> D0, D2, D3, D4 and the rest of the. If you are the first to understand this principle, we might Duokanjibian. The principle is simple but effective.
 

Control electrical appliances using PC

Control electrical appliances using PC

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