Load management via LPT. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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We manage 300 loads via LPT. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Computers

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Below is a diagram of a device for controlling loads, in a count. 300 pieces, using a computer through the LPT port.

(click to enlarge)

The scheme is based on shift registers 74hc595 with sequential data loading. The inputs of these registers are connected to the parallel port of the LPT computer, and the outputs are output to control devices.

The whole thing is powered by a 5V stabilized power supply and requires decent power from the source (up to several amperes).

The conclusions drawn on the diagram are low-power and to control more powerful loads, it is necessary to add keys (transistors, relays, thyristors, etc.). Also, when controlling loads with high voltages, it is recommended to install optocouplers to ensure galvanic isolation.

The device is controlled by a program specially written for this, which can be downloaded here.

Author: Alexey Klyushnikov, Ivanovo; Publication: cxem.net

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