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Introduction of remote control
Release time:
2024-07-24
Wireless industrial control products are learning remote control and copy remote control. The learning remote control has a learning function, which can be automatically paired with the learning controller
Wireless industrial control products are learning remote control and copy remote control. The learning remote control has a learning function, which can be automatically paired with the learning controller, and can be used directly without coding. It saves the trouble of preparing the remote control, and you can use it directly after you buy it and automatically match the code.
1 Introduction
Learning Remote Control Model: SR715 Self-Learning Remote Control
The learning remote control also has a copy function, which can copy any fixed code remote control. The learning remote control is equivalent to a key blank, which can engrave keys of any shape. Just clear the factory code of the learning remote control, and then copy the original remote control. The new remote control has all the functions of the original remote control.
With the advancement of technology, wireless remote control has also expanded to many types. In short, there are two common types, one is the infrared remote control mode (IR Remote Control) commonly used in home appliances, and the other is anti-theft alarm equipment, door and window remote control, automobile Remote control and other commonly used radio remote control mode (RF Remote Control). Both have different advantages, and the fields of application are also different.
2 types
Infrared remote control
Infrared remote control (IR Remote Control) is a remote control device that uses near-infrared rays with a wavelength of 0.76 to 1.5 μm to transmit control signals.
Learning infrared remote control can be divided into two categories: remote control learning in fixed code format and remote control learning in waveform copy mode. For the former, it is necessary to collect various types of remote control signals, then identify and compare them, and then record them. However, it is too difficult to achieve a successful replication of almost all infrared remote controls. Because, the infrared coding format of the infrared remote control changes too much. However, this kind of learning remote control has relatively simple hardware requirements, the operating frequency of the processor may not be high, and the storage capacity is also small. The latter is mainly to make a complete copy of the signal sent by the original remote control, regardless of the format of the remote control, and store it in a memory such as EEPROM. When transmitting, simply restore the waveform length recorded in the memory to the original signal. This kind of learning remote control has high requirements on the main frequency of MCU and large RAM requirements. Its advantage is that it can learn any kind of infrared remote control.
The commonly used infrared remote control system is generally divided into two parts: transmitting and receiving.
The main components of the emitting part are infrared light-emitting diodes. It is actually a special light-emitting diode. Because its internal material is different from ordinary light-emitting diodes, when a certain voltage is applied to its two ends, it emits infrared light instead of visible light.
The wavelength of infrared light emitted by ordinary infrared light-emitting diodes is about 940nm, and the shape is the same as that of ordinary light-emitting diodes, but the color is different.
The main components of the receiving part are infrared receiving diodes, which generally have two types: round and square. In practical applications, it is necessary to add reverse bias to the infrared receiving diode, so that it can work normally, that is, when the infrared receiving diode is used in the circuit, it is used in the reverse direction, so that higher sensitivity can be obtained.
Since the transmission power of infrared light-emitting diodes is generally small (about 100mW), the signal received by the infrared receiving diode is relatively weak, so a high-gain amplifier circuit should be added. In recent years, most of the infrared receiving heads are used.
Internal pictures of remote control products
There are roughly two types of packages for the finished infrared receiver: one is shielded with iron sheets; the other is plastic package. There are three pins, namely power positive (VDD), power negative (GND) and data output (VOUT). The pin arrangement of the infrared receiver is different due to different models, please refer to the manufacturer's instructions for use. The advantage of the finished infrared receiver is that it does not require complicated debugging and shielding of the shell, and it is very convenient to use like a triode. But pay attention to the carrier frequency of the finished infrared receiver when using it.
The common carrier frequency of wireless remote control infrared remote control is 38kHz, which is determined by the 455kHz crystal oscillator used by the transmitter. At the transmitting end, the crystal oscillator needs to be divided into integers, and the frequency division coefficient is generally 12, so 455kHz÷12≈37.9kHz≈38kHz. There are also some remote control systems that use 36kHz, 40kHz, 56kHz, etc., which are generally determined by the oscillation frequency of the crystal oscillator at the transmitting end.
The characteristic of infrared remote control is that it does not affect the surrounding environment and does not interfere with other electrical equipment. Because it cannot penetrate the wall, household appliances in different rooms can use a universal remote control without mutual interference; circuit debugging is simple, as long as the given circuit is connected correctly, generally it can be put into work without any debugging; codec Easy, multi-channel remote control is possible. Therefore, infrared remote control has been widely used in household appliances and indoor short-range (less than 10 meters) remote control.
radio remote control
A radio remote control (RF Remote Control) is a remote control device that uses radio signals to control various institutions in the distance. After these signals are received by the remote receiving device, they can instruct or drive various other corresponding mechanical or electronic devices to complete various operations, such as closing the circuit, moving the handle, and starting the motor, and then these machines will perform the required operations. As a kind of remote control supplemented with infrared remote control, it has been widely used in garage door, electric door, gate remote control, burglar alarm, industrial control and wireless smart home field.
Common transmitter and receiver module SR9915
The commonly used radio remote control system is generally divided into two parts: transmitting and receiving.
The transmitting part is generally divided into two types, namely the remote control and the transmitting module. The remote control and the remote control module are for the way of use. The module is used as a component in the circuit and is applied according to its pin definition. The advantage of using the remote control module is that it can be seamlessly connected with the application circuit, small in size, low in price, and make the best use of it, but the user must understand the circuit principle. , otherwise it is more convenient to use the remote control.
Generally speaking, the receiving part is also divided into two types, namely super-heterodyne and super-regenerative receiving methods. The super-regenerative demodulation circuit is also called a super-regenerative detection circuit, which is actually a regenerative detection circuit working in the intermittent oscillation state. The superheterodyne demodulation circuit is the same as the superheterodyne radio. It is set up with a local oscillator circuit to generate an oscillating signal, and after mixing with the received carrier frequency signal, an intermediate frequency (usually 465kHz) signal is obtained. Detect and demodulate the data signal. Since the carrier frequency is fixed, its circuit is simpler than that of a radio. The super-heterodyne receiver is stable, has high sensitivity and relatively good anti-interference ability; the super-regenerative receiver is small in size and cheap.
The commonly used carrier frequency of radio remote control is 315mHz or 433mHz, and the remote control uses the open frequency band stipulated by the state. It is freely used with the approval of the "Management Committee". The open frequency band in my country is 315mHz, while in Europe and the United States and other countries it is 433mHz, so the products exported to the above countries should use 433mHz remote control.
There are two types of coding methods commonly used in radio remote control, namely fixed code and rolling code. Rolling code is an upgraded product of fixed code. Where confidentiality is required, rolling coding method is used.
The rolling code encoding method has the following advantages:
1. Strong confidentiality, the code is automatically changed after each launch, and others cannot use the "code detector" to obtain the address code;
2. The coding capacity is large, the number of address codes is greater than 100,000 groups, and the probability of "duplicate codes" in use is small;
3. It is easy to match the code. The rolling code has the function of learning and storage. It does not need to use a soldering iron.
4. Small code error. Due to the advantages of coding, the misoperation of the receiver when it does not receive the local code is almost 0.
The encoding capacity of the fixed code is only 6561, and the probability of repeating the code is high. The encoding value can be seen through the connection of solder joints, or obtained by using a "code detector" at the site of use, so it does not have confidentiality. It is mainly used in Occasions with lower confidentiality requirements have also been widely used because of their lower price.
The difference between radio remote control and infrared remote control (The difference between IR and RF Remote Control), infrared remote control and wireless remote control are for different carriers, infrared remote control uses infrared to transmit control signals, its characteristics are It is directional, cannot be blocked, the distance is generally not more than 7 meters, and is not subject to electromagnetic interference. The TV remote control is an infrared remote control; the radio remote control uses radio waves to transmit control signals. It is characterized by non-directionality, It can not be controlled "face to face", the distance is long (up to tens of meters, even several kilometers), and it is easily susceptible to electromagnetic interference. In the fields that require long-distance penetration or non-directional control, such as industrial control, etc., it is easier to use a radio remote control.
3 learning methods
First, clear the existing address code
We have to press and hold the two B and C buttons on the top of the remote control at the same time. At this time, the LED flashes once and then goes out for about 2 seconds, and then the LED flashes quickly, which indicates that the original address code has been cleared. At this time, short press all the buttons and the LEDs flash. Turn off after a while.
The second step, copy the address code of other remote control
Place the original remote control and the learning remote control as close as possible, and press the button to be copied and a button of the learning remote control at the same time. This new lightning learning technology generally only takes 1 second to flash quickly, which means that the The address code has been successfully learned! The other 3 buttons on the remote control are also operated in the same way.
We can even combine and learn two remote controllers with different address codes (same frequency) into a self-learning remote controller. It should be noted that sometimes the mutual position of the original remote control and the learning remote control during learning is very important. Some may have better head-to-head effect, and some may have better back-to-back effect. Customers can try to learn a few times and see which one they learn. It is better to set the remote control distance Z farther.
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Introduction of remote control
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Tongcheng Logistics Equipment (Yangzhou) Co., Ltd.
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