About two years ago, the Raspberry Pi Foundation released a rather interesting device - a single-board computer, the size of which is slightly larger than a bank plastic card at a very attractive price. The novelty immediately gained immense popularity, the line of pre-orders for it stretched out for several months.

Raspberry Pi was presented in two trim levels: model “A” and model “B”. Both versions are equipped with a Broadcom BCM2835 ARM11 processor with a clock frequency of 700 MHz and a 256 MB / 512 MB RAM module. Model "A" is equipped with one USB 2.0 port, model "B" - with two. Model “B” has an Ethernet port. The BCM2835 processor also includes a graphics core. Video output is via a composite RCA connector or via a digital HDMI interface ...

Nowadays, there are already many industrial devices that are controlled by the GSM (Global System for Mobile Communication) standard — a digital standard for mobile communications or a now familiar mobile phone. This is a burglar alarm, various control cabinets for industrial equipment, or simply separate sockets.

The design in appearance is a regular adapter that plugs into a wall outlet. The load can be switched on by ringing or transmitting.sms by mobile phone. It is also possible manual control using two buttons located on the front panel. The power switched by such outlets, depending on the model, is in the range of 1 - 5 kW, which allows you to turn on almost any load. Multichannel sockets are also available that allow you to control independently multiple loads...

If you have not heard about the COCO home appliance remote control technology, then it's time to get to know it! After all, this is the most affordable and simple system for radio control of electrical appliances and "smart home".

The heart of the simplest version of the system is the AYCT-102 remote control. It contains a radio transmitter operating at a frequency of 433.92 MHz and allows you to control both individual electrical appliances plugged into sockets through radio adapters, or lighting, using miniature built-in receivers, and groups of electrical appliances. For example, simultaneously with several electric blinds or a group of spotlights located in different parts of the site.

The AYCT-102 remote control is designed to operate on 16 channels, divided into four subgroups. This makes it very easy to manage appliance groups ...

Water will find a hole. This proverb is known to all. The most important thing is that it is confirmed, albeit not very often, but the consequences can be the most deplorable. Here we will talk about what the leakage of water or sewer pipes in the apartment is fraught with. Often, we learn about these cases from an angry neighbor living on the floor below.

And, as a rule, the flooding of the lower neighbors occurs just after they made an expensive renovation, because they don’t do anything else now. Here you can see anything: a sagging and collapsed stretch ceiling, wallpaper behind the walls, a surfaced parquet or expanded linoleum, under which a warm floor was laid. And it’s not at all good for the flood to go for electrical wiring.

The drafting of acts begins, the circulation in the courts and house management companies. Repeated repairs are done, of course, at the expense of the upper neighbor. And about spoiled relationships and spent nerves ...

The timer socket is one of the most useful and at the same time affordable elements of home automation. Such a simple device can be very useful for you.

The timer socket can turn on the heater well in advance of your arrival, provide a comfortable temperature, and it can also control devices on a schedule. For example, the inhabitants of aquariums and terrariums need to turn on the light and compressor only at certain times. Also, in the long-term absence of the house, a timer socket with the function of random switching on, will allow you to create the effect of presence in the house, which will serve as a certain protection for your house. In these and many other cases, timer sockets are simply irreplaceable! There are two types of timers: electronic and mechanical. Mechanical timers are easier to operate. They are engaged in the work of the program ...

It is better to prepare a sled in the summer, as well as a heating system at home or in a summer house. It is not worth putting off “for later” the solution to this vitally important issue. After all, autumn cold can come suddenly, and it is important that the weather does not take you by surprise.

Homeowners who have gas connected to the house but who have no problems with heating and hot water can close this article and go about their business. This article is for people who want to make the most economical electric heating in the house, but the power allocated to their house (the limit of allowed power) is not enough to connect several heating appliances and other household appliances.

And the purchase of additional electric power from power engineers is not possible due to the unjustifiably high cost or physical absence of excess power due to old transformer substations. What electric heating system is the most ...

It just so happened that the power supply voltage in villages and towns often does not comply with GOST, and, as a rule, in a smaller direction. Instead of statutory 220 Volts in the outlet, we have less than 200 V. And during periods of mass arrivals of summer residents or when the heaters are cool on the street and electric heaters are turned on, the mains voltage drops even more significantly.

In such a situation, it is important to ensure reliable and safe operation of life support systems at home. To do this, you have to use a network voltage stabilizer - a simple and affordable way to maintain the voltage of a home electrical network within the framework of GOST.

However, if you feed from it all the electrical appliances available in the house, then the power of the device should be very large. Such a stabilizer requires space for installation in a dry, heated room, and it is very expensive ...

One of the tasks performed with the help of photosensors is lighting control. Such schemes are called photorelay, most often it is a simple inclusion of lighting in the dark. For this purpose, a lot of circuits were developed by ham radio operators, here are some of them.

Probably the simplest diagram is shown in the figure. The number of parts in it is small, it will not work less, and the efficiency, read the sensitivity, is quite high.

This is achieved by the fact that transistors VT1 and VT2 are connected according to a composite transistor circuit, also called Darlington circuit. With this inclusion, the gain is equal to the product of the gain of the components of the transistors. In addition, such a circuit provides a high input impedance, which allows you to connect high-impedance signal sources, as shown in the circuit ...