Use in the kitchen local lighting. As a rule our kitchens are covered the only light source is the ceiling or a chandelier hanging somewhere near the ceiling, in the middle.
Most often, this lamp General purpose lights no matter Desk — when the hostess is preparing lunch, she closes herself from the world of the working area on the plate.
Inconvenient such a lamp and in that case, when the family gathers at the dinner table (usually standing at the window or wall) — it illuminates not the table, and the center of the kitchen. In the end, for normal illumination of the working and dining tables in the chandelier have to screwing the lamp of high power, thus causing high power consumption.
Four years ago in the “Modeller-designer” was published my article on snowblower. Today, I present to the readers a material of another property – the use of GSM communication channel (i.e. cell phone) to the alarm system. This is, perhaps, a new direction in Amateur practice. Suffice it to say that in the famous magazine “Radio” was only two publications on this topic. But, given some “heavy” “fancy” schema processors, programming, intervention in the scheme of the cell phone will pull not everyone (even seasoned) hams.
Good day! In this post I want to share with the Internet community on how I happened to make a automatic light on the stairs in his two story cottage. About four months ago, returning from work in the dark, I successfully slipped and broke two pljusnevyh bone (finger) on his left foot. A whole month had fail in bed, so as to step on the foot was incredibly painful. Then another half of the month was lame without plaster (who had fractures, I’ll understand). After this sad story, I began to think about automating the lighting of the stairs. A bit of tinkering with the search query found a very simple solution in this blog, just based on my favorite Arduino microcontroller. The scheme did not cause any difficulties, but was baffled by the number and length of the wires that I had to mount. Prior to that, did nothing of the sort. To buy ready decisions, or to hire someone is expensive.
In the memorable 1990-e years I worked at the Kirov plant instrument maintenance computer. Every morning we had to go down to the basement to enable refrigeration. Bulbs in the basement then disappeared, burned out. In short, as a rule, to see the switch, had to use matches: even to buy a flashlight for the plant was the problem. Then appeared the idea to make such a lamp yourself. From the power supply batteries and battery items I refused: they often fail, leak or anything. I did almost “eternal” condenser flashlight.
Among the means of self-defense e-treskovye device (ASH) – not in last place, especially the strength of psychological impact on criminals. However, the costs are considerable, which encourages radio Amateurs to create homemade analogues (detailed material about it see, for example, in No. 5,’99 the magazine “modelist-Konstruktor”.
In order to obtain a sound signal of high power (10 – 20W) from the simple Assembly of a sound generator, does not require complex amplifiers WOOFER.
On the recommendation of the manufacturer to eliminate the memory effect of Nickel-cadmium batteries (NiCd) should clear their element to 0.4 V. For the implementation of the above requirements and automate the process of disconnecting the battery reaches level 0.4 V the authors propose a simple device.
Of the readers who didn’t lose metal parts or tools? Sometimes it happens at the most inopportune time and threatens to permanently stop work. Lost somewhere in the grass screwdriver that fell behind the Cabinet chisel or a failure in a pier of pliers is able to ruffle anyone. In such cases a simple device – a magnetic probe with light and sound alarm. Using this simple device, you can easily find the loss in hard to reach places and the fact findings you will be notified outbreak warning led and buzzer. The principle of operation of the probe is quite simple – on a long rod fixed two magnet “sticking” to the metal object which closes the circuit and lights the warning led. Thus, you can know when the probe with discovery, you can extract the “light”.
RC replica model in 1/9 scale American bomber during the Second World war. Model made from balsa and plywood construction designed for use with internal combustion engines.
Security systems are a rapidly developing area of modern electronics. Published a huge number of various schemes and designs that can make anyone a couple of times was holding the soldering iron. For example, “electronic security guards” can warn of an intruder enters the premises or to signal the presence of the recorder for unauthorized sound recordings.