Circuit Schematic Control Electrical Appliances using PC

Computer. - This is electronic Circuit Schematic Control Electrical Appliances using PC like in Figure 1 below. In this circuit schematic the basic component used are opto coupler and transistor. 

In here we will give you global description about Circuit Schematic Control Electrical Appliances using PC and then we will give you link to continue your reading from original source as external website.

Circuit Schematic

Component Part

  • Opto Coupler
  • Resistors
  • Capacitor
  • Tansistor
  • Diode
  • Relay
  • PC Paralel Port

Circuit schematic like in Figure 1 above is Circuit Schematic Control Electrical Appliances using PC. Electronicszone site describe that this is a circuit for using the printer port of a PC, for control application using software and some interface hardware. The interface circuit along with the given software can be used with the printer port of any PC for controlling up to eight equipment .

The interface circuit shown in the figure is drawn for only one device, being controlled by D0 bit at pin 2 of the 25-pin parallel port. Identical circuits for the remaining data bits D1 through D7 (available at pins 3 through 9) have to be similarly wired. The use of opto-coupler ensures complete isolation of the PC from the relay driver circuitry.
Lots of ways to control the hardware can be implemented using software. 

In C/C++ one can use the outportb(portno,value) function where portno is the parallel port address (usually 378hex for LPT1) and ‘value’ is the data that is to be sent to the port. For a value=0 all the outputs (D0-D7) are off. For value=1 D0 is ON, value=2 D1 is ON, value=4, D2 is ON and so on. eg. If value=29(decimal) = 00011101(binary) ->D0,D2,D3,D4 are ON and the rest are OFF.

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