Note: When using PT2272-L4, pay attention to matching the oscillation resistor and the sending end. The same goes for the address. H5V3M reception is 315MHZ. H5V4D is 433.92MHZ, please pay attention when using it. The onboard switching power supply circuit is only a backup and is not verified as a main function. There are reserved pin positions for connecting to 5V power supply. PT2272 wireless remote control light-onboard switching power supply physical screenshot:
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