To keep the driver awake at the wheel. Scheme, description

Free technical library

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

To keep the driver awake at the wheel. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices

Comments on the article

It is known how difficult it is for a car driver to struggle with sleep during long trips at night and early morning. But the slightest weakening of the driver's attention can turn into a disaster!

The figure shows a schematic diagram of a device that automatically turns on the car's horn at the moment when the driver began to fall asleep and relaxed his fingers squeezing the steering wheel. The power of the sound signal is quite enough to "shake" the driver and make him hold the steering wheel tighter, or, if this does not help, to attract the attention of drivers of other vehicles.

This device is easy. The "heart" of the device is a self-oscillator, made according to the "capacitive three-point" scheme on the transistor T1. The base of the transistor T1 through the capacitor C3 is connected to the metal rim A, reinforced around the perimeter of the steering wheel. When the driver tightly grips the steering wheel, due to the large capacitance of the driver's body relative to the mass of the car, the base of the transistor T1 is shunted by the capacitor C3, as a result of which generation does not occur.

To keep the driver awake at the wheel
If the driver relaxes his fingers, the shunt capacitance will decrease and the generator will be excited at a frequency of about 300 kHz. The voltage of this frequency from the collector of the transistor T1 is fed through the emitter follower on the transistor T2 to the input of the detector, made on the diodes D1 and D2. The voltage rectified by the diodes opens the transistors T3 and T4 of the electronic relay, as a result of which relay P1 is activated, closing the sound signal circuit with its contacts.

Adjustment of the device is reduced to setting the required sensitivity of the oscillator. This is done using the potentiometer R4. In addition, the potentiometer R5 regulates the operating current of the electronic relay.

The device is powered from the on-board network with a voltage of +12 V. Coil L1 is wound on a ferrite rod, its inductance is 1 ins.

Transistors T1-T3 can be of the KT315 type with any letter index, T4 - KT361. Diodes D1 and D2 - D9V-D9E, D3 - KS156A, D4 - D226B. Turnip R1 - with a coil resistance of at least 120 ohms.

Literature

"Radio Electronics", 1970, No. 9

Publication: N. Bolshakov, rf.atnn.ru

See other articles Section Automobile. Electronic devices.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive

fresh water from the air 09.09.2013

Scientists from the Massachusetts Institute of Technology, in collaboration with colleagues from Chile, have developed a device that collects drinking water from the air. This is not a unique human invention: in some of the planet's driest regions, plants and animals have uniquely adapted to water scarcity. In places where precipitation is extremely rare or even non-existent, animals and plants draw water directly from the air, and more specifically the fog that drifts from the oceans.

Scientists were able to repeat this "trick", only on a much larger scale, and created an installation that is capable of extracting up to 10% of moisture from the fog. Similar installations are already operating in 17 countries around the world, but their efficiency rarely reaches even 2%.

Conventional systems for collecting water from air consist of a vertical network made of polyolefin fibers. These networks are cheap, but inefficient, since even under optimal conditions they can extract only 2% of the moisture from the fog.

Specialists from MIT were able to choose the ideal network parameters and dramatically increase its efficiency. First of all, it is necessary to replace synthetic fibers with a stainless steel net with threads 2-3 times the thickness of a human hair. In addition, a special coating must be applied to the net, which allows droplets to slide more easily through the net and enter the water collection chute before the wind blows them away and carries them away with the rest of the fog. At the same time, it is important that the mesh size of the network is 2 times larger than the diameter of the fibers from which this network is made.

A prototype of the new device has been tested in coastal mountains on the edge of the Atacama Desert. With a network area of 1 sq. m. managed to get several liters of drinking water per day. Moreover, as calculations have shown, at certain times of the year such a device can collect up to 12 liters of fresh water per day. If you use a network placed in several rows one after another, then you can collect much more moisture than the calculated 10%.

Other interesting news:

▪ An effective way to dye your hair

▪ Earth Asteroid Shield

▪ Live fast - live longer

▪ Worst year in human history

▪ There are fewer bees, but crops have not fallen

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Metal detectors. Article selection

▪ article by José Ortega y Gasset. Famous aphorisms

▪ article Why does the highest mountain in the world have an English name? Detailed answer

▪ backpack article. Tourist tips

▪ article Multi-storey TV antenna. Encyclopedia of radio electronics and electrical engineering

▪ article Scheme, pinout (pinout) cable Panasonic G450, G500 + pinout. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews