1, wireless remote control systemThe general remote control device should have the ability to resist the same frequency interference, but sometimes in the encounter of strong same frequency interference, the receiving device will occasionally show no action or misaction. This situation occasionally occurs in the working environment of high temperature and high radiation and in the crane controlled by frequency converter.
2, first of all, the most common reason is insufficient battery power or battery aging. After the remote control is used for a long time, the battery performance will decline, resulting in unstable signal transmission. In this case, replacing a whole new set of batteries can often solve the problem. For example, you can choose high-quality alkaline batteries, which often provide moreStable current output and longer service life.
3, the garage door remote control clear code is to use the clear code function to clear the code information and then re-learn the pairing. The garage door remote control usually uses the radio remote control in the remote control, rather than the infrared remote control, because compared with the infrared remote control commonly used in household appliances, the radio remote control has the following advantages, the radio remote control is to use radio waves to transmit control signals.
4, the effect of infrared in addition to its wavelength, but also related to the number of photons emitted, that is, related to radiation intensity and radiation time, excessive infrared radiation can also beIt can cause adverse effects on the body, and its detailed mechanism needs to be further elucidated. Cao Zhiran et al believe that infrared irradiation has indirect and direct effects on the body's immune system.
5. Other airlines have reported that the use of mobile phones by passengers has affected cabin pressure, magnetic direction, navigation and ground-to-air communication systems [4]. Even scarier was an incident recorded in NASA's Flight Safety Reporting System, a platform that anonymously reports aviation accidents, when a Boeing 737's locator suddenly underwent a large deflection during a night landingDIY walkie-talkie wireless PTT, for the simplest wireless control circuit
Connect the non-grounded pin of the walkie-talkie ptt switch (that is, the end connected to the CPU) to the collector of 9013, and the emitter of 9013 is grounded. This shows that when we press the radio transmitter PTT, this is when the PTT ground the negative circuit of the power supply, and when the button is released, the PTT ground circuit is disconnected, which is equal to waiting for receiving standby.
PTT originally refers to the intercom mode of wireless phones, as long as you press a button to talk, and later in the third generation of mobile communication technologyIt's translated as one-click in the mobile business.
The function of this button is to make wireless intercom calls in the wireless area. The PTT of the walkie-talkie, simply speaking, means that you can press the PTT button to talk to each other. The PTT key on the walkie-talkie is the launch key, and the function is that the user presses the key and speaks to the MIC. After the speech is finished, the key can be released to the other party.
Walkie-Talkie ptt is a mobile phone service that uses the push-to-talk (PoC) service of GPRS mobile phones to achieve wireless telephone-like communicationMessage mode. twowayradio is a two-way mobile communication tool invented by JohnKermode in the 1920s. This device can make calls without any network support. It is suitable for fixed and frequent calls.
1, the use of relays and single-chip computers for non-intelligent electrical appliances, can be controlled by relay and single-chip computers. The relay can play the role of circuit on and off, while the single chip microcomputerThe control of the relay can be realized through programming. The specific operation is to connect the electrical appliance with the relay, and then connect the output of the single chip microcomputer with the relay. By writing the computer program, the control of the single chip microcomputer is realized, and the working state of the electrical appliance is controlled.
2, another method is to directly control household appliances through serial communication or network communication. For some household appliances that support serial communication or network communication, the user can directly send control instructions by writing a specific control program to connect the computer with the household appliance. This method requires the user to have a certain knowledge of programming as well as household appliancesHave an in-depth understanding of communication protocols.
3, in order to achieve the above process need to weld the circuit, wiring, preparation of single-chip computer program, and then make a beautiful interface on the computer, so that you can use the computer to control home appliances.
Determine the relay type: According to the application needs, select the appropriate relay type, such as electromagnetic relay, solid state relay, time relay, etc. Consider the load and contact capacity: according to the actual need to control the load current and voltage, select the corresponding contact capacity. assessorEnvironment: Consider the use of the relay environment, such as temperature, humidity, electromagnetic interference, etc., to ensure that the relay can adapt to the working environment.
The following factors should be considered when selecting the relay: shape and installation mode, including installation area and installation foot position, the appropriate size should be selected according to the specific requirements of the machine.
The selection of intermediate relays should mainly consider the following points: contact type, capacity requirements, voltage and current specifications, environmental conditions and other special requirements. Contact type The contact type of the intermediate relay directly affects its performance. Common contact types include silver alloy contacts, gold contacts, and copper contactsLet's wait. When selecting, the appropriate contact material should be selected according to the actual use scenario and needs.
Consider environmental factors. Such as working environment temperature, humidity, vibration, etc., these factors will affect the performance and service life of the relay, it is necessary to choose a relay that can adapt to these environments. Compare the selection parameters. Compare the performance parameters of different types of relays, such as switching speed, electrical life, mechanical life, etc., and select the model with the best performance. Consider the cost factor. Under the premise of meeting the performance requirements, choose a lower cost relay.
Considering reliability and life when selecting a thermal relay,Reliability and longevity need to be considered. Reliability refers to whether the thermal relay can work stably and reliably during long-term use, and life refers to the service life of the thermal relay. Generally speaking, thermal relays with higher brand awareness tend to have better reliability and life.
Various load surge characteristics of solid-state relay SSR selection The controlled load will produce a large surge current at the moment of switching on, because the heat is too late to dissipate, it is likely to cause damage to the internal thyristor of the SSR, so the user should analyze the surge characteristics of the controlled load when selecting the relay, and then select the relay. relayingThe device can withstand this surge current under the premise of steady state operation. Please refer to Table 2 for derating coefficients under various loads (at normal temperature) when selecting.
1, put the 9V battery on the output of the regulator block, it can be solved, and other complex methods should not be tried. Add one to the 12V power supply circuitA 12VDC DC relay with a set of normally closed contacts that control the circuit of the battery.
2, the alarm uses 9V battery, it can not directly use 12V power supply, because the high voltage will burn the alarm. However, the alarm power is not large, you can connect a three-terminal integrated voltage regulator (such as LM7809) behind the 12V power supply, the circuit is very simple, can be welded, and get a stable 9V voltage to the alarm.
3, with a 12V2A adapter, plus a 7809 voltage regulator circuit, you can supply power to two devices at the same time.
4, trouble! 12V to 5V is simple, add a thyristor on the line. 18V to 9V is not easy. Switch the power and forget about it. If it is a coil transformer, lead a line out in the middle of the secondary coil (the middle of the entire secondary coil), which is equivalent to two 9V AC voltages, after the ballast! I suggest you buy a ready-made one! Not expensive! About 10 bucks.
Anti-theft relay is generally used to control the oil circuit, directly connected to the oil pump line can be.The anti-theft device mainly uses the existing telephone network or wireless mobile phone GSM network to communicate with the master phone or mobile phone through wireless or wired means to achieve remote anti-theft functions of electronic products. At present, the popular products on the market mainly consist of an anti-theft host that accepts the signal and a series of police detection heads.
Positive to negative connection: First of all to use the relay, not the thing inside the alarm, the alarm inside called the breaker relay and 4 feet and 5 feet of the relay.
Connect the two green wires on the relay to both ends of the disconnected starting wire, and the fine white wire is disconnectedThe open starting wire is close to the end of the key door, and the thin yellow wire is connected to the thin yellow wire on the alarm device. Knowledge extension: Car anti-theft device is a device installed on the car to increase the difficulty of car theft and extend the time of car theft.
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