Precautions for wireless communication module are as follows:
1. Ensure a reasonable communication rate. The maximum transmission data rate of the data module is 9.6KBs, which is generally controlled at around 2.5k. Too high a data rate will reduce the receiving sensitivity and increase the bit error rate, or even fail to work at all.
2. Ensure a reasonable information code format. When the microcontroller and the module are working, they usually define the transmission protocol themselves. Regardless of the modulation method used, the information code format to be transmitted is very important, which will directly affect the reliable transmission and reception of data.
3. The interference of the microcontroller on the receiving module. When the microcontroller simulates 2262, it is generally normal. However, when the microcontroller simulates 2272 decoding, it is usually found that the remote control distance is shortened a lot. This is because the multiplication of the clock frequency of the microcontroller will interfere with the receiving module. The electromagnetic interference of the 51 series microcontroller is relatively large, 2051 is slightly smaller, and the PIC series is relatively small. We need to adopt some anti-interference measures to reduce interference. For example, the single-chip microcomputer and the remote control receiving circuit are powered by two 5-volt power supplies respectively, the receiving board is powered by a 78L05 alone, the clock area of the single-chip microcomputer is far away from the receiving module, the operating frequency of the single-chip microcomputer is reduced, and a shield is added in the middle.
