China Netcom, China Telecom, China Mobile, China Unicom Universal, Telecom Mobile Unicom Universal Remote Control

China Netcom, China Telecom, China Mobile, China Unicom Universal, Telecom Mobile Unicom Universal Remote Control

Precautions for matching wireless remote control

Wireless remote control is widely used in our life. Such as automotive electronics, smart home systems, electric doors and windows, electric doors and windows, community access management, anti-theft alarm, industrial control and other industries.

Now let's introduce the wireless remote control by the editor of Shenzhen Keguanglong Technology Co., Ltd.

Manufacturer of wireless remote control.jpg

The wireless remote control is divided into wireless transmission and wireless reception. The wireless receiving part is generally located in the equipment host, and the wireless receiving part usually adopts the out-of-tolerance receiving module, so common faults are not easy to occur. The wireless transmission module is portable, so the common failure of the wireless transmission module is much larger than that of the receiver module, and of course the service life is much shorter. In this way, the replacement output power of the wireless remote control will be very high.

How to select a remote control and how to match it when a new remote control is purchased. For this problem, the following is how to match the wireless remote control.

When matching the wireless remote control, we must find out the output power of the remote control, send and receive the main control chip and the oscillation resistance. These are the three basic elements that match remote transmission and reception. If one does not match, it cannot be used.

1、 Output power

At present, most remote controls on the market are 315M, and a few are 433M, 310M and 430M special models.

Take the 2260.2264 chip remote control transmission signal receiver as an example to find the output power and the main control chip: take the most common four-button remote control as an example, open the remote control shell, and see the value R315A of the sound meter element (such as the same small metal button or crystal vibration element) on the circuit board, and the table shows 315MHz.

2、 Sending and receiving chip

The electronic devices on the circuit board are numbered chips, and the models can be found on the surface of the electronic devices.

According to the numbering form, the remote control can be divided into three parts

Wireless driving remote control.jpg

1. Fixed code remote control

Also known as number remote control and soldering code remote control, commonly used sending chips PT, SC, HS, LX (260/22/22/22/2PT, SC, LX, HS (2270/2272/2294). They are the chip coding areas that are sent and received, and the numbers that are sent and received can be properly matched. In other words, the coding area of the remote controller and the coding area of the signal receiver are welded to be the same.

2. Learning code remote control

Common sending chips EV, HS, LX. SC (1527/2240), HCS101, etc. The matched receiver is the program storage IC, single chip computer, etc. in the main computer, such as PIC16F630, PIC16F505, PIC16F629, etc.

3. Scroll code remote control

The common sending chip has the model function received by HCS pairing and is the same as the learning code remote control, such as 301/200/201.

3、 Oscillating resistance

Taking PT264 chip as an example, PT circuit design diagram 2264 chip remote controller, R11 is oscillation resistance

Search method for the vibration resistance of the 2264 chip remote controller: Usually in the RC position, that is, the 2264 chip between 15 and 16 feet can't be found. The chip resistance on the opposite side of the circuit board between two feet is the dynamic resistance. There are numbers on the resistance, which is generally one of 125.155.225.335.475.

Needless to say, the resistance power, such as 125=12 * 10 ^ 5=1200K Ω=1.2M Ω

475=47*10^5=4700KΩ=4.7

204=20*10^5=2MΩ

2260-R Method to find the oscillation resistance of chip remote controller:

The 2260 chip remote controller is small in size, strong in compatibility and stable in quality. At present, many small remote controllers on the market use this chip. The 1-8 pin (A0~A7) address bits of the SC2260-R4, the 9-pin grounding (GND), the 10-13 pin (D3~D0) are data bits, the 14-foot is the oscillation resistance connecting the pull-up resistance oscillation, the 15-foot is the data transfer pin (TXD), and the 16-pin is the power supply pin (VDD).

The resistance between the 14th foot and the positive power supply is the oscillating resistance. The number on the resistance is usually one of 475.515.126.186.206. PT2262.SC2262.PT2264.HX2262.CS5211.CS5212 and other chips are compatible with the mode. When used, the 2272 DSP chip can be matched only by changing the oscillation resistance.