Connection diagram of 51 MCU and NRF24L01 wireless module-EEWORLD

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There is a connection problem between the 5V 51 microcontroller and the NRF24L01 wireless module. They said that improper connection will cause the following problems:

1. The power supply voltage of NRF24L01 wireless module is 3.3V, but when the wireless module is plugged in, the power supply voltage of the module is 4.5V. This is very puzzling. The 1117-3.3V power supply output is 3.3V, but the power supply voltage increases when the module is plugged in. This is because the 5V voltage of the 51 microcontroller I/O port is backflowed from the SPI port of NRF24L01! So improper connection will bring you unnecessary losses.

2. Another possible reason is that the communication is not possible. The program of NRF24L01 is relatively simple. If the program is fine, then the problem must be in the hardware. Many friends asked me why my wireless module cannot communicate? I have been adjusting it for a week or even a month, but there is no result. I am already very tired and don’t want to see the NRF24L01 module. It gives me a headache when I see it, haha. I am not trying to discourage you. I will stop here and post the connection diagram!

Reference address：Connection diagram of 51 MCU and NRF24L01 wireless module

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