Menu English Ukrainian russian Home

Free technical library for hobbyists and professionals Free technical library


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

Encoder and decoder of telecontrol commands. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Radio control equipment

Comments on the article Comments on the article

The advantages of digital systems for encoding and decoding commands in remote control equipment for models have already been noted in the literature. Another version of the encoder-decoder complex for 15 discrete commands, designed for the same purpose, is described below.

The scheme of the encoder is shown in fig. 1, and the decoder - in Fig. 2. The waveform at some characteristic points of the device is shown in fig. 3.

Telecontrol encoder and decoder
(click to enlarge)

At the output of the command encoder, there are bursts of pulses of negative polarity (graph 4 in Fig. 3).

The repetition rate of bursts of pulses is f / 32, where f is the frequency of the master oscillator, made on the logic elements DD1.1.DD1.2 (Fig. I) according to the symmetrical multivibrator circuit.

From the master oscillator, the pulses (graph 1) are fed to the counter DD2 and to the element of coincidence .DD4.1. Pulses with frequency f will pass through this element when triggers DD3 and DD1.3.DD1.4 are in a single state (graphs 2 and 3). Counting trigger DD3 switches after every 16th pulse received at the counter DD2. The free inputs of the DD3 trigger are combined and connected through a 1 kΩ resistor to the positive output of the power source. RS-trigger DD1.3.DD1.4 is set to the single state by the zero signal level at output 0 (pin 1) of the decoder DD5 and to the zero state by the zero signal level at that of the decoder outputs, which is connected to pin 2 of the DD1.4 element. 1 through the contacts of one of the buttons SB 15-SB XNUMX.

The number of impulses in a pack is equal to the number of the pressed button. If none of the buttons is pressed, then the encoder generates bursts of 16 pulses, since the RS-trigger DD1.3.DD1.4 is not transferred to the zero state.

Telecontrol encoder and decoder
(click to enlarge)

The command decoder is assembled on four microcircuits (Fig. 2). A node assembled on the elements DD1.2.DD1.3. is a pulse selector. During the time between two pulses of negative polarity with a frequency f, the capacitor C1 does not have time to charge up to a voltage sufficient to transfer the element DD1.2 to the zero state, and the signal level corresponding to logic 1.3 remains at the output of the element DD0. During the same the time interval between bursts of pulses, the capacitor C1 is charged to a unit voltage at pin 2 of the DD1.2 element (graph 5) and a signal 1.3 appears at the output of the DD1 element (graph 6). Diode VD1 provides fast discharge of capacitor C1.

Telecontrol encoder and decoder
(click to enlarge)

By the decay of the pulses from the output of the element DD1.3, the counter DD2 is set to zero, and from their fronts, the differentiating circuit C3.R4 generates pulses for writing information from the counter DD2 to the storage node on the trigger DD3. With one pulse in the pack, the counter DD2 remains in the zero state, with two it goes to state 1, with three it goes to state 2, etc.

Actuators are connected to the outputs of the decoder DD4 through an intermediate link - an electronic relay. The circuit of the electronic relay is shown in fig. 4. The first electronic relay is connected to output 0 (pin 1) of the DD4 decoder, the second to output 1, etc. The sixteenth relay, connected to pin 17, is on when none of the buttons is pressed in the encoder. With this construction of the receiver, only one actuating device can be switched on at the same time. It turns on for the time the button is pressed in the command encoder in the transmitter.

For independent switching on and off of actuators, independently between the decoder and each electronic relay, it is necessary to turn on the RS-trigger according to the diagram in Fig. 5. Trigger inputs are connected to two adjacent decoder outputs; for example, the inputs S and R of the first trigger are connected to outputs 0 and 1 of the decoder, respectively, the second to outputs 2 and 3, the third to outputs 4 and 5, etc. The number of actuators is halved. Capacitor C1 is required to set the RS flip-flop to a single state when the power is turned on.

When the output of the RS flip-flop is high, relay K1 is de-energized. If for some time a 0 signal is applied to input R, the trigger will be set to zero and relay K1 will turn on. The relay will turn off when a zero signal level is applied for some time to input S. Thus, a command on one of the channels turns on the relay, and on the next one it turns it off. If necessary, a part of the electronic relays can be switched on according to the scheme of fig. 4, and the rest - with an RS flip-flop. Relay K1 - RES15, passport RS4.591.003.

When checking the operability of the device, the output of the command encoder is connected to the input of the decoder. The frequency of the master oscillator can be chosen differently, you just need to select the capacitor C1 in the command decoder (at a higher frequency, the capacitance of the capacitor should be smaller). There are no high requirements for the frequency stability of the master oscillator.

Author: V. Inozevtsev, Bryansk; Publication: N. Bolshakov, rf.atnn.ru

See other articles Section Radio control equipment.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Improving the efficiency of PbS quantum dot solar cells 14.06.2024

The latest solar technology research represents a significant breakthrough in improving the efficiency of PbS quantum dot solar cells. This method, based on the use of pulsed light, offers promise for simplifying the production and expanding the applications of these cells. A research team from the Daegu Gyeongbuk Institute of Science and Technology has developed an innovative method that uses pulsed light to improve the electrical conductivity of PbS solar cells. This method can significantly reduce the processing time required to achieve similar results. PbS quantum dot solar cells have significant potential in solar technology due to their photovoltaic properties. However, the formation of defects on their surface can reduce their performance. The new method helps suppress defect formation and improve electrical conductivity. Using strong light to complete the process ... >>

Magnetic Power Bank 5000mAh 14.06.2024

Huawei introduces a convenient and multifunctional charger to the market - Huawei SuperCharge All-in-One Magnetic Power Bank. This magnetic battery allows you to quickly and conveniently charge your Huawei phone anywhere, anytime. With a thickness of just 11,26 mm and a weight of 141 grams, this portable power bank fits easily into a pocket or bag, making it ideal for travel and everyday use. Despite its compact size, this battery provides enough power to charge your phone on the go. The new product supports wired charging with a power of 25 W and wireless charging up to 15 W (and up to 30 W when connected to an adapter), providing fast charging for both the power bank itself and other devices. The battery is compatible with various fast charging protocols such as SCP, UFCS and PD, making it ideal for a wide range of devices. The power bank is also compatible with Huawei phones that support wireless charging. ... >>

Changes in a father's brain after the birth of a child 13.06.2024

A recent study conducted by scientists from the Hefei Institute of Physical Sciences of the Chinese Academy of Sciences found interesting changes in the brains of men after becoming fathers. These changes were associated with involvement in child care, sleep problems, and mental health symptoms. Scientists found that men who became fathers experienced a loss of brain volume after giving birth. This volume loss was associated with greater involvement in parenting, sleep problems, and mental health symptoms. Researchers have found significant changes in men's brains between the prenatal and postnatal periods. In particular, there was a loss of gray matter volume, especially in parts of the brain responsible for higher functions such as language, memory, problem solving and decision making. Men who paid more attention to their children and spent more time with them lost more gray matter in their brains. This also affected their mental health ... >>

Random news from the Archive

Ceramic motor tested 15.10.2017

The American company GE Aviation, together with specialists from the US Army, has completed testing of the first prototype of a new gas turbine engine, in the design of which ceramic matrix composites are widely used.

In 2011, the US military announced that they needed new gas turbine engines that were economical to operate and relatively inexpensive to manufacture. Power plants are planned to be installed on different types of helicopters. According to GE Aviation, the use of ceramics in the design of advanced engines will reduce the cost of their production by simplifying the production cycle and reduce the cost of operation due to the longer resource of ceramic composites compared to traditional materials.

Ceramic matrix composites have a wide operating temperature range, and parts made from such materials can normally operate at much higher temperatures than conventional metal alloy elements. This allows you to expand the operating range of the propulsion system as a whole. Ceramic parts will be produced using XNUMXD printing technology.

According to the requirement of the military, the new engines must have 80% more power density than modern power plants. In addition, the specific fuel consumption of new engines should be 35% less, and the estimated resource - 20% more. Finally, the cost of production and maintenance of the project's power plants should be reduced by 45%. GE Aviation believes these requirements are quite feasible.

Testing of the first engine prototype in autumn 2016. The engine went through many start and stop cycles, it was tested for the possibility of long-term operation. During the test, the developers monitored the reliability of the compressor, combustion chamber and turbine, and these elements were tested both as part of the power plant and separately on a special stand. Other details about the inspections carried out were not disclosed.

Power plants will be produced in several versions. They will differ from each other in size and power. Depending on the version, the engines will be able to develop power from five to ten thousand horsepower (3,7-7,4 thousand kilowatts). First of all, the power plants are considered as a replacement for the T700 engines of the AH-64 Apache and UH-60 Black Hawk helicopters. T700 engines in several dozen versions have been produced since 1973 and have a power of 6,1 to 7,4 kilowatts.

Other interesting news:

▪ Remains of ancient giants found

▪ Interactive and 3D TV

▪ CAMM is the new standard for ultrabook RAM

▪ The Milky Way is almost invisible

▪ Heavy-duty shell helmet material

News feed of science and technology, new electronics

 

Interesting materials of the Free Technical Library:

▪ section of the site Note to the student. Article selection

▪ article Ship model with a steam engine. Tips for a modeller

▪ article Which of the ocean creatures is the noisiest? Detailed answer

▪ article Paddle for a swimmer. Personal transport

▪ article Triac power regulators. Encyclopedia of radio electronics and electrical engineering

▪ article Improved Battery Discharge Limiter. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

Name:


Email (optional):


A comment:





All languages ​​of this page

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

www.diagram.com.ua

www.diagram.com.ua
2000-2024