How to turn on the arduino with a signal from the NRF24L radio module?

Question

Arduino

There are two boards Arduino UNO (measuring unit with sensors) Arduino NANo (receiver with NR24L and GSM module), how to make ARDUINO UNO wake up from the NRF24L radio module, take readings and send to ARDUINO NANO? Help with this question!

Answer 1

Set the NRF24L (0x00 CONFIG register) interrupt on the IRQ pin to receive only (MASK_RX_DR bit), link the IRQ pin to the wake-up pin (with the assigned interrupt). Thus, after turning on the arduin, it fully configures all the NRF24L registers to the desired channel and is configured to wake up on an interrupt, and then falls asleep while waiting for receive activity on the selected channel. How NRF24L will accept the packet into the buffer - set the interrupt output and the arduino will continue to work - read the receive buffer, send a response and fall asleep again.