If there is no
adsorption, adsorption is recommended; there are two options:
1. Replace the antenna of the transmitting end with TX433-XPH-300,
2. Try replacing the antenna of the receiving end with TX433-JK-20, and at the same time, the suction cup is adsorbed on the iron sheet.
The problem caused by the short circuit of P0.3 (TXD) and PROG pin; please contact the technical staff for detailed solutions.
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