Factors affecting ask transmitting and receiving control View: 65000 Author:Jame Publish Time: 2020-05-12
Q: Factors affecting ask transmitting and receiving control ?
A: 1. Frequency point: the transmitter and receiver should be at the same frequency point, such as 433M, 315m, 390m, 868m, 915m, etc., for example, if the transmitter is 433M and the receiver is 315m, it cannot be controlled;
2. Encoding and decoding methods: Generally speaking, there are two ways to encode and decode ask: fixed code (the most common ones are pt22602262, hs22602262, etc.), different chip manufacturers, and different chip prefixes; learning code (EV1527, hs1527 chip, or million groups of learning codes written by MCU), which needs to be controlled normally. First, you need to understand the encoding and decoding methods clearly;
3. Cycle: for the receiving module written by MCU, the learning code wide cycle is 1.56ms (± 20%). The oscilloscope can capture data. No matter whether the transmitting and receiving sides are confirmed, the other side needs to adjust the resistance value of the oscillation resistance to match;
4. Code value: different manufacturers have different code value definitions. Not all remote controllers with the same appearance have the same code value. There are two ways: first, use an oscilloscope to grab the code value of the transmitter, and the receiver defines the code value according to the code value of the transmitter when decoding; second, contact the manufacturer to modify the code value;
To sum up, there is no way for us to determine the factors that affect ask communication, because transmit and receive are a pair of combo punches. We emphasize match. Whether it is control or distance, we emphasize match. If one end is fixed, we will match the encoding and decoding mode, period, code value of the other end ... to achieve the best combination.