Recently, I am working on a learning-type remote control. According to the initial design, I have added the hs0038 Integrated Receiver to identify the two formats of RC5 NEC. Later, it was found that the better method was waveform replication and analysis. Because the integrated receiving header could not measure the carrier, it could not be used as a learning remote control for complete waveform replication.
Looking for information, we can see that some designers use the emission diode as the receiving tube at the same time. At the beginning, I thought it was a special tube. However, there are no other tubes in combination with the learning-type remote control that was previously disassembled. Therefore, I also learned that some learning-type remote control ICS, such as cl518 and dc6688flb, have verified some circuit diagrams, and the actual verification is OK.
When used as the receiving tube, the positive electrode of the transmitting tube is connected to Gnd, and the negative electrode is resistor to VCC. Therefore, the circuit design can be referred. When learning, you must keep the two tubes aligned in a straight line at around 5cm. The better the pair, the more accurate the learning effect.
Appendix:
1. data1
2. data2
3. data3
4. Repeat
5. interpret the waveform, which is just reversed to the above waveform. You can compare the above waveform horizontally.