Arduino
23 USD I have 5 Arduino nano to which the NRF24L01+ radio modules are connected. Four of them are transmitters, and one receiver.
Transmitters transmit the invertered state of the D4 pin, and the receiver extract the signal received from the transmitters and extract it to the D5 pin by the following algorithm: if one transmitter transmits a high level, then the receiver extract a high level to the D5, if all transmitters transmits a low level, then the receiver extract a low level to the D5 pin.
Also, if the transmitter does not come out to the connection, the receiver assigns such a transmitter as a low level, until the moment of the connection is restored.
Also use the hardware stretch for the D4 pin.
The numbers of the pins are not principle (signals that will come and come from the pins are logical 0 and 5 in.
The radio module is set to CE - D7, CSN - D8, MOSI - D11, MISO - D12, SCK - D13.
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