First, operating frequency
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At present, most of the remote controls on the market are 315M, and a small number are 433M, 310M, 430M and other special models.
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Taking 2260, 2264 chip remote control transmitter receiver as an example, the search method of working frequency and chip model: Taking the most common four-button remote control as an example, open the remote control shell, and see that the value of the sound meter component on the circuit board (like a small metal button or similar crystal oscillator) is R315A, indicating 315MHz.
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2. Transmit and receive chip
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The coding chip is the integrated circuit on the circuit board, and the model number can be found on the surface of the integrated circuit.
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Remote control can be divided into three types according to the code form:
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1, fixed code remote control
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Also known as the code remote control, welding code remote control, commonly used transmitter chip PT, SC, HS, LX (2260\/2262\/2264), paired receiving chip PT, SC, LX, HS(2272\/2294). Transmit and receive the same code to use the correct pairing. In other words, the coding area of the new remote control is welded to the same as the coding area of the receiver.
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2, learn code remote control
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Commonly used transmitter chips EV, HS, LX, SC (1527\/2240), HCS101 and so on. The paired reception is a memory IC with a program in the host computer, a single chip computer, etc.
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3. Scroll code remote control
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The commonly used transmitter chips are HCS301\/200\/201, etc., and the model and function of the received pair are the same as that of the learning code remote control.
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Three, oscillating resistance
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Oscillating resistance is an ordinary resistance, where the frequency of oscillation can be determined.
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2264 chip remote control oscillation resistance search method: usually in the RC position, that is, between the 15th and 16th feet of the 2264 chip, if it can not be found, the patch resistance on the opposite side of the corresponding circuit board between the two feet is the oscillation resistance, there are numbers on the resistance, usually 125, 155, 225, 335, 475 in a certain value.
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These resistance values should go without saying, for example 125=12*10^5=1200KΩ=1.2 MΩ
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The above content is the introduction of how to match the universal wireless remote control, the transmitter and receiver chip is also a very common part of the entire wireless remote control process, it is an integrated circuit on the circuit board, the model is found on the surface of the integrated circuit, and it must be selected correctly when matching. Only after these aspects are fully matched, can the wireless remote control play an important role.