The PC controls the electrical installations. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Computers
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In recent years, quite a lot of control devices for various electrical installations have been described in amateur radio literature. In most cases, they are built on the basis of a microcontroller, most often - PIC16F84, due to its relatively low price and a large amount of literature on this topic. However, if it is necessary to develop such a device, say, for a home Christmas tree, a radio amateur needs to learn the microcontroller assembler, purchase (or assemble) a programmer, and spend a lot of time and effort debugging the program.
A much simpler option seems to be using a personal computer for control, even the simplest one. Today, many radio amateurs have such computers, and it remains only to make an actuator. Since it is not always possible to open the system unit of a computer, in order to install such a device in it, you will also have to assemble a power source (or use a ready-made one manufactured by the industry). However, this disadvantage is compensated by the flexibility in repurposing the executive device for various tasks and the convenience of the system in terms of programming - well-known high-level languages or assembler for the IBM PC are used.
Schematic diagram of an eight-channel actuator is shown in the figure. As you can see, it is made on the DD1 register and is connected to the parallel port of the PC.
The register is used in an unusual way, but works fine. Optothyristors TO-125-12,5-10 installed on heat sinks were used as power elements. LEDs HL1-HL8 indicate the operation of the channels. The power supply contains a step-down transformer T1, a rectifier VD1, a microcircuit stabilizer DA1 and filter capacitors C1-C3.
As examples of the use of such a device in table. Figures 1 and 2 show the "Running Fire" and "Random Selection" control programs, using which you can check the device's performance and write others.
(click to enlarge)
Author: A.Gridasov, Kursk
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