It is used to receive data from the microcontroller 4 IRQ It is an interrupt pin that alerts the master when new data is available to process. 3 MOSI (Master Out Slave In) It is SPI input to the nRF24L01. We need to keep this pin high except when we are sending the device an SPI command or receiving data on the SPI bus from the micro-controller. 2 CSN (Chip Select Not) It is an active-LOW pin and is normally kept HIGH. So, we can connect it directly to the 3.3V output of our Arduino. Pin Name Pin Specifications 1 VCC This pin is used to supply power to the module. NRF24L01 pinout and specifications are given below. Its maximum range is up to 100 meters if used in an open space with an antenna. Power consumption of the module is very low, only 9.0mA at an output power of -6dBm and 12.3mA in RX mode which is even less than a LED. Transceiver means the same module can be used as a transmitter or receiver. NRF24L01 is a single-chip radio transceiver that uses the 2.4 – 2.5 GHz ISM band world-wide.
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